Signal reconstruction method and device and polarization multiplexing self-homodyne detection system
阅读说明：本技术 信号重建方法、装置及偏振复用自零差探测系统 (Signal reconstruction method and device and polarization multiplexing self-homodyne detection system ) 是由 张森 于 2020-05-30 设计创作，主要内容包括：本申请实施例提供了一种信号重建方法、装置、偏振复用自零差探测系统、存储介质及通信装置,包括：采集收端信号的直流分量和交流分量,根据直流分量和预设的标定参数,生成偏振态旋转信息,根据偏振态旋转信息和交流分量重建无偏振串扰对应的I、Q信号,通过基于各直流分量对偏振态旋转信息进行确定,并基于偏振态旋转信息和各交流分量对信号进行重建,即得到无偏振串扰对应的I、Q信号,相较于相关技术,避免了设置并调整偏振控制器PC造成的耗时较长,从而对偏振态(State of Polarization,SOP)跟踪速度有限,实现了快速响应偏振态SOP变化的技术效果。(The embodiment of the application provides a signal reconstruction method, a signal reconstruction device, a polarization multiplexing self-homodyne detection system, a storage medium and a communication device, and the method comprises the following steps: the method comprises the steps of collecting a direct current component and an alternating current component of a receiving end signal, generating Polarization State rotation information according to the direct current component and preset calibration parameters, reconstructing I, Q signals corresponding to non-Polarization crosstalk according to the Polarization State rotation information and the alternating current component, determining the Polarization State rotation information based on the direct current components, and reconstructing the signals based on the Polarization State rotation information and the alternating current components to obtain I, Q signals corresponding to the non-Polarization crosstalk.)
1. A signal reconstruction method, applied to a polarization-multiplexed self-homodyne detection system, the method comprising:
collecting a direct current component and an alternating current component of a receiving end signal;
generating polarization state rotation information according to the direct current component and preset calibration parameters;
and reconstructing I, Q signals corresponding to the non-polarization crosstalk according to the polarization state rotation information and the alternating current component.
2. The method of claim 1, wherein the calibration parameters comprise: direct current component calibration parameters and attenuation coefficient calibration parameters.
3. The method of claim 2, further comprising:
and determining the direct current component calibration parameter according to the power of the signal light and the power of the local oscillator light.
4. The method of claim 3, wherein the dc component calibration parameters comprise: the maximum value of the dc component; and/or, a minimum value of the direct current component.
5. The method according to claim 4, wherein if the power of the originating signal light is greater than the power of the local oscillator light, the calibration parameter of the direct current component is the maximum value of the direct current component; and if the power of the signal light at the transmitting end is less than that of the local oscillation light, the direct current component calibration parameter is the minimum value of the direct current component.
6. The method of claim 4, further comprising:
and selecting the maximum value and/or the minimum value from the direct current components in the preset time period.
7. The method according to any one of claims 2 to 6, wherein the polarization rotation information includes first rotation information and second rotation information, and the generating the polarization rotation information according to the direct current component and a preset calibration parameter includes:
generating the first rotation information according to the direct current component and the attenuation coefficient calibration parameter;
and generating the second rotation information according to the direct current component, the direct current component calibration parameter and the first rotation information.
8. A signal reconstruction apparatus, wherein the apparatus is applied to a polarization-multiplexed self-homodyne detection system, the apparatus comprising:
the acquisition module is used for acquiring a direct current component and an alternating current component of a receiving end signal;
the generating module is used for generating polarization state rotation information according to the direct current component and preset calibration parameters;
and the reconstruction module is used for reconstructing I, Q signals corresponding to the non-polarization crosstalk according to the polarization state rotation information and the alternating current component.
9. The apparatus of claim 8, wherein the calibration parameters comprise: direct current component calibration parameters and attenuation coefficient calibration parameters.
10. The apparatus of claim 9, further comprising:
and the determining module is used for determining the direct current component calibration parameter according to the power of the signal light and the power of the local oscillator light which are sent by the sending end.
11. The apparatus of claim 10, wherein the dc component calibration parameters comprise: the maximum value of the dc component; and/or, a minimum value of the direct current component.
12. The apparatus according to claim 10, wherein the determining module is configured to determine the dc component calibration parameter as a maximum value of the dc component if the power of the originating signal light is greater than the power of the local oscillator light; and if the power of the signal light at the transmitting end is smaller than the power of the local oscillation light, determining the direct current component calibration parameter as the minimum value of the direct current component.
13. The apparatus of claim 10, further comprising:
and the calibration module is used for selecting the maximum value and/or the minimum value from the direct current components in the preset time period.
14. The apparatus according to any one of claims 9 to 13, wherein the polarization rotation information comprises first rotation information and second rotation information, and the generating module is configured to generate the first rotation information according to the dc component and the attenuation coefficient calibration parameter, and generate the second rotation information according to the dc component, the dc component calibration parameter, and the first rotation information.
15. A polarization multiplexed self-homodyne detection system, the system comprising: a laser, a polarization beam splitter, an optical modulator, a polarization beam combiner, a polarization beam splitting rotator, an optical mixer, two ac-coupled balanced photodetectors, and an optical digital signal processor, wherein the polarization multiplexed self-homodyne detection system further comprises the apparatus of any of claims 8 to 14.
16. The system of claim 15, wherein the two AC-coupled balanced photodetectors are adapted as two balanced photodetectors with monitor ports, wherein,
the balanced photoelectric detector with a monitoring port is used for outputting a direct current component of the I-path signal;
and the other balanced photoelectric detector with a monitoring port is used for outputting a direct current component of the Q-path signal.
17. The system of claim 16, further comprising: a photodetector disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
the photoelectric detector is used for outputting a direct current component and an alternating current component of an Rx path signal; and/or, outputting the direct current component and the alternating current component of the Ry path signal;
wherein, the Rx path signal is output by the polarization beam splitting rotator, and at least part of the optical signal split from one of the two optical signals is output by the photodetector; the Ry path signal is output by the polarization beam splitting rotator, and at least part of the optical signal split from the other optical signal in the two paths of optical signals is output by the photoelectric detector.
18. The system of claim 16, further comprising: a balanced photodetector with a monitor port disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
the balance photoelectric detector with the monitoring port is used for outputting a direct current component and an alternating current component of the Rd path signal;
the Rd path signal is an output signal of at least part of split optical signals passing through the balanced photodetector with the monitoring port, among two paths of optical signals output by the polarization beam splitting rotator.
19. The system of claim 15, further comprising: an optical mixer arranged between the polarization beam splitting rotator and the signal reconstruction device, two balanced photodetectors in direct current coupling, and two photodetectors arranged between the polarization beam splitting rotator and the signal reconstruction device,
the optical mixer is used for mixing at least part of optical signals output by the polarization beam splitting rotator;
a DC-coupled balanced photodetector behind the optical mixer for outputting the DC component of the I-channel signal according to the mixed optical signal;
another DC-coupled balanced photodetector after the set optical mixer is used for outputting the DC component of the Q-path signal according to the optical signal after frequency mixing;
a photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device and used for outputting an alternating current component of an Rx path signal and/or an alternating current component of an Ry path signal;
and the other photoelectric detector arranged between the polarization beam splitting rotator and the signal reconstruction device is used for outputting a direct current component of the Rx path signal and/or a direct current component of the Ry path signal.
20. The system of claim 15, further comprising: an optical mixer and two DC-coupled balanced photodetectors arranged between the polarization beam splitter rotator and the signal reconstruction device, and further comprising a DC-coupled balanced photodetector and an AC-coupled balanced photodetector arranged between the polarization beam splitter rotator and the signal reconstruction device,
the optical mixer is used for mixing at least part of optical signals output by the polarization beam splitting rotator;
a DC-coupled balanced photodetector behind the optical mixer for outputting the DC component of the I-channel signal according to the mixed optical signal;
another DC-coupled balanced photodetector after the set optical mixer is used for outputting the DC component of the Q-path signal according to the optical signal after frequency mixing;
the alternating current coupled balance photoelectric detector is arranged between the polarization beam splitter rotator and the signal reconstruction device and is used for outputting an alternating current component of the Rd path signal;
and the direct-current coupled balance photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device is used for outputting a direct-current component of the Rd path signal.
21. The system of claim 15, further comprising: two DC-coupled balanced photodetectors disposed between the optical mixer and the signal reconstruction device, and two photodetectors disposed between the polarization beam splitter rotator and the signal reconstruction device,
a DC-coupled balanced photodetector disposed between the optical mixer and the signal reconstruction device for outputting a DC component of the I-channel signal;
another DC-coupled balanced photodetector arranged between the optical mixer and the signal reconstruction device is used for outputting a DC component of the Q-path signal;
a photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device and used for outputting an alternating current component of an Rx path signal and/or an alternating current component of an Ry path signal;
and the other photoelectric detector arranged between the polarization beam splitting rotator and the signal reconstruction device is used for outputting a direct current component of the Rx path signal and/or a direct current component of the Ry path signal.
22. The system of claim 15, wherein the two ac-coupled balanced photodetectors are adapted as two dc-coupled balanced photodetectors, the system further comprising: a photodetector disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
a DC-coupled balanced photodetector for outputting the DC component and the AC component of the I-path signal;
the other direct-current coupled balanced photoelectric detector is used for outputting a direct-current component and an alternating-current component of the Q-path signal;
the photoelectric detector arranged between the polarization beam splitting rotator and the signal reconstruction device is used for outputting a direct current component and an alternating current component of an Rx path signal; and/or outputting the direct current component and the alternating current component of the Ry path signal.
23. The system of claim 15, wherein the two ac-coupled balanced photodetectors are adapted as two dc-coupled balanced photodetectors, the system further comprising: a DC-coupled balanced photodetector disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
the adjusted DC coupled balance photoelectric detector is used for outputting a DC component and an AC component of the I-path signal;
the adjusted other DC coupled balanced photoelectric detector is used for outputting a DC component and an AC component of the Q-path signal;
and the direct-current coupled balance photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device is used for outputting a direct-current component and an alternating-current component of the Rd-path signal.
24. A computer storage medium having stored thereon computer instructions which, when executed by a processor, cause the method of any of claims 1 to 7 to be performed.
25. A signal reconstruction apparatus, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores computer instructions executable by the at least one processor, the computer instructions being executable by the at least one processor to cause the method of any one of claims 1 to 7 to be performed.
26. A communications apparatus, comprising:
the input interface is used for acquiring a direct current component and an alternating current component of a receiving end signal;
logic circuitry for performing the method of any one of claims 1 to 7, resulting in I, Q signals corresponding to unpolarized crosstalk;
and the output interface is used for outputting I, Q signals corresponding to the unpolarized crosstalk.
Technical Field
The present application relates to the field of signal processing technologies, and in particular, to the field of self-homodyne detection systems, and in particular, to a signal reconstruction method and apparatus, a polarization multiplexing self-homodyne detection system, a storage medium, and a communication apparatus.
Background
Polarization multiplexing Self-Homodyne Detection (PDM-SHD) is used for characterizing a system which adopts one Polarization state to transmit local oscillator light and the other Polarization state to transmit signal light, and the signal light and the local oscillator light are transmitted in the same optical fiber.
In the transmission process of signal light and local oscillation light, signal crosstalk may be caused by optical fibers due to factors such as circular asymmetry, internal stress, pressure, bending and environmental temperature change in the production process. In order to solve the problem of signal crosstalk, the prior art generally adopts the following methods: a Polarization Controller (PC) is inserted before the Polarization beam splitter PSR, and the Polarization Controller PC is feedback-controlled by tracking the change of the Polarization state of the output light of the Polarization beam splitter PSR in real time, so that the receiving end Polarization beam splitter PBS splits the signal light and the local oscillator light.
However, the inventors found that the prior art has at least the following problems: because the feedback control polarization controller PC is generally implemented by using an adaptive algorithm (such as a gradient algorithm), the algorithm principle is based on blind search of the maximum value or the minimum value of a certain parameter (such as a power value), the maximum value or the minimum value can be converged to a target value after iteration for at least dozens of times to hundreds of times, each cycle needs to detect the current power value, and the working voltage or the working current of the polarization controller PC needs to be adjusted and issued next step is calculated so that the polarization controller PC works. Therefore, a problem of consuming a long time may be caused.
Disclosure of Invention
In order to solve the foregoing technical problems, embodiments of the present application provide a signal reconstruction method and apparatus, a polarization multiplexing self-homodyne detection system, a storage medium, and a communication apparatus.
According to an aspect of an embodiment of the present application, a signal reconstruction method is provided, where the method is applied to a polarization-multiplexed self-homodyne detection system, and the method includes:
collecting a direct current component and an alternating current component of a receiving end signal;
generating polarization state rotation information according to the direct current component and preset calibration parameters;
and reconstructing I, Q signals corresponding to the non-polarization crosstalk according to the polarization state rotation information and the alternating current component.
In the embodiment of the application, the Polarization State rotation information is determined based on each direct current component, and the signal is reconstructed based on the Polarization State rotation information and each alternating current component, so that I, Q signals corresponding to non-Polarization crosstalk are obtained, and compared with the related art, the problems that the time consumption caused by setting and adjusting a Polarization Controller (PC) is long, the tracking speed of the change of the Polarization State (SOP) is limited, and the accuracy is low are solved, and the technical effects of rapidly responding to the change of the SOP of the Polarization State and outputting accurate and reliable signals are achieved.
In some embodiments, the calibration parameters include: direct current component calibration parameters and attenuation coefficient calibration parameters.
In some embodiments, the method further comprises:
and determining the direct current component calibration parameter according to the power of the signal light and the power of the local oscillator light.
In some embodiments, the dc component calibration parameters include: the maximum value of the dc component; and/or, a minimum value of the direct current component.
In some embodiments, if the power of the signal light at the transmitting end is greater than the power of the local oscillator light, the calibration parameter of the direct current component is the maximum value of the direct current component; and if the power of the signal light at the transmitting end is less than that of the local oscillation light, the direct current component calibration parameter is the minimum value of the direct current component.
In some embodiments, the method further comprises:
and selecting the maximum value and/or the minimum value from the direct current components in the preset time period.
In some embodiments, the polarization rotation information includes first rotation information and second rotation information, and the generating polarization rotation information according to the dc component and a preset calibration parameter includes:
generating the first rotation information according to the direct current component and the attenuation coefficient calibration parameter;
and generating the second rotation information according to the direct current component, the direct current component calibration parameter and the first rotation information.
According to another aspect of the embodiments of the present application, there is also provided a signal reconstruction apparatus, which is applied to a polarization-multiplexed self-homodyne detection system, the apparatus including:
the acquisition module is used for acquiring a direct current component and an alternating current component of a receiving end signal;
the generating module is used for generating polarization state rotation information according to the direct current component and preset calibration parameters;
and the reconstruction module is used for reconstructing I, Q signals corresponding to the non-polarization crosstalk according to the polarization state rotation information and the alternating current component.
In some embodiments, the calibration parameters include: direct current component calibration parameters and attenuation coefficient calibration parameters.
In some embodiments, the apparatus further comprises:
and the determining module is used for determining the direct current component calibration parameter according to the power of the signal light and the power of the local oscillator light which are sent by the sending end.
In some embodiments, the dc component calibration parameters include: the maximum value of the dc component; and/or, a minimum value of the direct current component.
In some embodiments, the determining module is configured to determine the dc component calibration parameter as a maximum value of the dc component if the power of the originating signal light is greater than the power of the local oscillator light; and if the power of the signal light at the transmitting end is smaller than the power of the local oscillation light, determining the direct current component calibration parameter as the minimum value of the direct current component.
In some embodiments, the apparatus further comprises:
and the calibration module is used for selecting the maximum value and/or the minimum value from the direct current components in the preset time period.
In some embodiments, the polarization state rotation information includes first rotation information and second rotation information, and the generating module is configured to generate the first rotation information according to the dc component and the attenuation coefficient calibration parameter, and generate the second rotation information according to the dc component, the dc component calibration parameter, and the first rotation information.
According to another aspect of the embodiments of the present application, there is also provided a polarization multiplexing self-homodyne detection system, including: the polarization multiplexing self-homodyne detection system comprises a laser, a polarization beam splitter, an optical modulator, a polarization beam combiner, a polarization beam splitting rotator, an optical mixer, two alternating current coupled balanced photoelectric detectors and an optical digital signal processor, and further comprises the device in any one of the embodiments.
In some embodiments, the two ac-coupled balanced photodetectors are adapted as two balanced photodetectors with monitoring ports, wherein,
the balanced photoelectric detector with a monitoring port is used for outputting a direct current component of the I-path signal;
and the other balanced photoelectric detector with a monitoring port is used for outputting a direct current component of the Q-path signal.
In some embodiments, the system further comprises: a photodetector disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
the photoelectric detector is used for outputting a direct current component and an alternating current component of an Rx path signal; and/or, outputting the direct current component and the alternating current component of the Ry path signal;
wherein, the Rx path signal is output by the polarization beam splitting rotator, and at least part of the optical signal split from one of the two optical signals is output by the photodetector; the Ry path signal is output by the polarization beam splitting rotator, and at least part of the optical signal split from the other optical signal in the two paths of optical signals is output by the photoelectric detector.
In some embodiments, the system further comprises: a balanced photodetector with a monitor port disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
the balance photoelectric detector with the monitoring port is used for outputting a direct current component and an alternating current component of the Rd path signal;
the Rd path signal is an output signal of at least part of split optical signals passing through the balanced photodetector with the monitoring port, among two paths of optical signals output by the polarization beam splitting rotator.
In some embodiments, the system further comprises: an optical mixer arranged between the polarization beam splitting rotator and the signal reconstruction device, two balanced photodetectors in direct current coupling, and two photodetectors arranged between the polarization beam splitting rotator and the signal reconstruction device,
the optical mixer is used for mixing at least part of optical signals output by the polarization beam splitting rotator;
a DC-coupled balanced photodetector behind the optical mixer for outputting the DC component of the I-channel signal according to the mixed optical signal;
another DC-coupled balanced photodetector after the set optical mixer is used for outputting the DC component of the Q-path signal according to the optical signal after frequency mixing;
a photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device and used for outputting an alternating current component of an Rx path signal and/or an alternating current component of an Ry path signal;
and the other photoelectric detector arranged between the polarization beam splitting rotator and the signal reconstruction device is used for outputting a direct current component of the Rx path signal and/or a direct current component of the Ry path signal.
In some embodiments, the system further comprises: an optical mixer and two DC-coupled balanced photodetectors arranged between the polarization beam splitter rotator and the signal reconstruction device, and further comprising a DC-coupled balanced photodetector and an AC-coupled balanced photodetector arranged between the polarization beam splitter rotator and the signal reconstruction device,
the optical mixer is used for mixing at least part of optical signals output by the polarization beam splitting rotator;
a DC-coupled balanced photodetector behind the optical mixer for outputting the DC component of the I-channel signal according to the mixed optical signal;
another DC-coupled balanced photodetector after the set optical mixer is used for outputting the DC component of the Q-path signal according to the optical signal after frequency mixing;
the alternating current coupled balance photoelectric detector is arranged between the polarization beam splitter rotator and the signal reconstruction device and is used for outputting an alternating current component of the Rd path signal;
and the direct-current coupled balance photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device is used for outputting a direct-current component of the Rd path signal.
In some embodiments, the system further comprises: two DC-coupled balanced photodetectors disposed between the optical mixer and the signal reconstruction device, and two photodetectors disposed between the polarization beam splitter rotator and the signal reconstruction device,
a DC-coupled balanced photodetector disposed between the optical mixer and the signal reconstruction device for outputting a DC component of the I-channel signal;
another DC-coupled balanced photodetector arranged between the optical mixer and the signal reconstruction device is used for outputting a DC component of the Q-path signal;
a photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device and used for outputting an alternating current component of an Rx path signal and/or an alternating current component of an Ry path signal;
and the other photoelectric detector arranged between the polarization beam splitting rotator and the signal reconstruction device is used for outputting a direct current component of the Rx path signal and/or a direct current component of the Ry path signal.
In some embodiments, the two ac-coupled balanced photodetectors are adapted as two dc-coupled balanced photodetectors, the system further comprising: a photodetector disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
a DC-coupled balanced photodetector for outputting the DC component and the AC component of the I-path signal;
the other direct-current coupled balanced photoelectric detector is used for outputting a direct-current component and an alternating-current component of the Q-path signal;
the photoelectric detector arranged between the polarization beam splitting rotator and the signal reconstruction device is used for outputting a direct current component and an alternating current component of an Rx path signal; and/or outputting the direct current component and the alternating current component of the Ry path signal.
In some embodiments, the two ac-coupled balanced photodetectors are adapted as two dc-coupled balanced photodetectors, the system further comprising: a DC-coupled balanced photodetector disposed between the polarization beam splitter rotator and the signal reconstruction device, wherein,
the adjusted DC coupled balance photoelectric detector is used for outputting a DC component and an AC component of the I-path signal;
the adjusted other DC coupled balanced photoelectric detector is used for outputting a DC component and an AC component of the Q-path signal;
and the direct-current coupled balance photoelectric detector arranged between the polarization beam splitter rotator and the signal reconstruction device is used for outputting a direct-current component and an alternating-current component of the Rd-path signal.
According to another aspect of the embodiments of the present application, there is also provided a computer storage medium having stored thereon computer instructions, which, when executed by a processor, cause the method of any of the above embodiments to be performed.
According to another aspect of the embodiments of the present application, there is also provided a signal reconstruction apparatus, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores computer instructions executable by the at least one processor, the computer instructions being executable by the at least one processor to cause the method of any of the above embodiments to be performed.
According to another aspect of the embodiments of the present application, there is also provided a communication apparatus, including:
the input interface is used for acquiring a direct current component and an alternating current component of a receiving end signal;
logic circuitry configured to perform the method according to any of the above embodiments to obtain I, Q signals corresponding to unpolarized crosstalk;
and the output interface is used for outputting I, Q signals corresponding to the unpolarized crosstalk.
Drawings
The drawings are included to provide a further understanding of the embodiments of the application and are not intended to limit the application. Wherein the content of the first and second substances,
fig. 1 is a schematic view of an application scenario according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a polarization-multiplexed self-homodyne detection system in the related art;
FIG. 3 is a schematic flow chart of a signal reconstruction method according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a signal reconstruction apparatus according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a polarization-multiplexed self-homodyne detection system provided by an embodiment of the present application;
FIG. 6 is a schematic diagram of a polarization-multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 7 is a schematic diagram of a polarization-multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 8 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 9 is a schematic diagram of a polarization-multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 10 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 11 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 12 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 13 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 14 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in another embodiment of the present application;
FIG. 15 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in accordance with yet another embodiment of the present application;
FIG. 16 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in accordance with yet another embodiment of the present application;
FIG. 17 is a schematic diagram of a polarization multiplexed self-homodyne detection system provided in accordance with yet another embodiment of the present application;
FIG. 18 is a schematic diagram of a balanced photodetector with monitor port and a photodetector with monitor port of the related art;
fig. 19 is a schematic diagram of a dc-coupled balanced photodetector and a dc-coupled photodetector in the related art.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Referring to fig. 1, fig. 1 is a schematic view of an application scenario of an embodiment of the present application, and the polarization multiplexing self-homodyne detection system provided in the embodiment of the present application adopts electric domain depolarization multiplexing, and can recover original information of a signal sent by a sending end without a polarization controller PC and a complex feedback control system.
In the application scenario shown in fig. 1, the network element includes two network elements, which are a network element a and a network element B, and an optical module is inserted into each of the two network elements, where an optical module inserted into the network element a is referred to as an optical module a, and an optical module inserted into the network element B is referred to as an optical module B.
The information sent by the network element a to the network element B modulates an electrical signal to signal light through a sending end of an optical module a, the sending end of the optical module a uses one polarization state to transmit the signal light and uses the other polarization state to transmit local oscillator light, as Tx shown in fig. 2 (where fig. 2 is a schematic diagram of a polarization multiplexing self-homodyne detection system and will be described in detail later). Optical signals (including signal light and local oscillator light) are transmitted from a transmitting end of the optical module A to a receiving end of the optical module B through an optical fiber link, and are converted into electric signals after being demodulated by the optical module B. The receiving end of the optical module B is Rx as shown in fig. 2.
Similarly, optical signals (including signal light and local oscillator light) are transmitted from the transmitting end of the optical module B to the receiving end of the optical module a through the optical fiber link, and are demodulated and converted into electrical signals by the optical module a.
Referring to fig. 2, fig. 2 is a schematic diagram of a polarization-multiplexed self-homodyne detection system in the related art.
As shown in fig. 2, the light from the laser is split into two orthogonal Polarization states, X and Y, by a Polarizing Beam Splitter (PBS).
The light in the X polarization state may be modulated by the optical modulator to become signal light, and the light in the Y polarization state may not be modulated.
It should be understood that, in the embodiment of the present application, it is only exemplarily illustrated that the X polarization state may be the signal light, and the Y polarization state may be the local oscillator light, and in other embodiments, the X polarization state may be the local oscillator light, and the Y polarization state may be the signal light.
The light of two Polarization states is combined into a Beam by a Polarization Beam Combiner (PBC) and output to an optical Fiber link, such as an optical Fiber link composed of Single Mode Fiber (SMF), and the length of the optical Fiber link can be set according to requirements, such as 2km and 10 km.
One of the resultant lights is divided into two lights with the same Polarization state, such as lights with X Polarization state, by a Polarization beam Splitter Rotator (PSR).
The Polarization Beam Splitter Rotator PSR may be composed of a Polarization Beam Splitter (PBS) and a Polarization Rotator (PR), among others. The polarization beam splitter PBS can split a beam of axially aligned light having two polarization directions into two orthogonal linear polarization states, and the polarization rotator PR can rotate the light having one polarization state by a fixed angle (e.g. 90 °), for example, so that the light having the Y polarization state is changed to the light having the X polarization state, and E is obtainedxAnd Ey。
Two paths of light with the same polarization state are subjected to frequency mixing through an Optical mixer 90-degree Hybrid, Optical signals are converted into electric signals through two alternating current coupled Balanced Photodetectors (BPD), namely an I path Signal and a Q path Signal, and then the electric signals are sent to an Optical Digital Signal Processor (ODSP) for Digital Signal Processing. Wherein the two ac-coupled balanced photodetectors may be BPD1 and BPD2 as shown in fig. 2.
It should be noted that due to the factors such as the circular asymmetry, the internal stress, the pressure during the use, the bending, and the ambient temperature change in the optical fiber link production, a random birefringence effect may be generated in the optical fiber link, so that the polarization state of the light input to the optical fiber link may be randomly changed when the light is output, which may be referred to as an optical fiber polarization rotation effect, and the optical fiber polarization rotation effect may cause polarization crosstalk to occur in the respective optical signals in the X-polarization state and the Y-polarization state at the two outputs of the polarization beam splitter PSR. I.e. E of the PSR output of the polarization beam splitter rotatorxAnd EyThe path signals both include light of the originating X polarization state and light of the originating Y polarization state. Here, a signal of light in the X polarization state (i.e., signal light) is referred to as an X signal, and a signal of light in the Y polarization state (i.e., local oscillation light) is referred to as a Y signal. The polarization rotation effect of the optical fiber canTo represent with jones matrix:
where θ is a rotation angle and δ + β is a phase angle, which are both quantities that vary randomly with time.
In the related art, in order to solve the problem of Polarization crosstalk occurring at the output of the Polarization beam splitter PBS due to the fiber Polarization rotation effect, a Polarization Controller (PC) may be inserted before the Polarization beam splitter PSR, and the Polarization Controller PC is controlled by real-time tracking the Polarization state change of the output light of the Polarization beam splitter PSR and feeding back, so that the receiving end Polarization beam splitter PBS splits the signal light and the local oscillation light.
The polarization controller PC is an optical device for controlling polarization state, and can convert one path of input light with any polarization state into another path of output light with any polarization state. The principle of the polarization controller PC is that the inverse matrix of the equivalent Jones matrix of the fiber polarization rotation is realized by utilizing the cascade wave plate, so that two paths of orthogonal polarization states without polarization crosstalk can be output through the polarization beam splitter PBS.
However, when the solution of setting the polarization controller PC in the related art is used for polarization demultiplexing, an adaptive algorithm (such as a gradient algorithm) is generally used for implementation, and the algorithm principle is based on blind search of a maximum value or a minimum value of a certain parameter (such as a power value, etc.), iteration is generally performed at least dozens of times to hundreds of times to converge to a target value, each cycle needs to detect a current power value, calculate a working voltage or a working current of the polarization controller PC which needs to be adjusted next step, and issue the working voltage or the working current of the polarization controller PC, so that the polarization controller PC works. Therefore, it may take a long time to track the polarization state with a limited speed and a low accuracy.
The inventor of the application obtains the inventive concept of the application through creative work: polarization state rotation information caused by the optical fiber polarization rotation effect is determined, and a polarization crosstalk signal is restored based on the polarization state rotation information, so that a signal received by a receiving end (as shown in fig. 1, if a network element a is a transmitting end, the receiving end is a network element B, and if the network element B is the transmitting end, the receiving end is the network element a) is a signal which is not subjected to crosstalk.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
According to an aspect of the embodiments of the present application, a signal reconstruction method is provided, which may be applied to a polarization-multiplexed self-homodyne detection system.
Referring to fig. 3, fig. 3 is a flowchart illustrating a signal reconstruction method according to an embodiment of the present disclosure.
As shown in fig. 3, the method includes:
s101: and collecting the direct current component and the alternating current component of the receiving end signal.
The signal reconstruction method according to the embodiment of the present application may be implemented by a signal reconstruction device, and the signal reconstruction device may include a dc component detection unit, an ac component detection unit, and a calculation processing unit that may be integrated in an optical signal digital processor ODSP, where the calculation processing unit may specifically be a chip having a calculation processing function.
In the embodiment of the present application, each dc component and each ac component may be collected in a plurality of ways, and the number of the dc components and the ac components in the embodiment of the present application is not limited. Wherein, the quantity of direct current component and alternating current component respectively is at least two.
That is to say, in the embodiment of the present application, the acquisition mode of each dc component is not limited, and the number of the dc components and the ac components is not limited, as set forth in the following embodiments: the balanced photodetector BPD with ac coupling may be replaced with a dc coupled balanced photodetector BPD; a dc output port may also be disposed behind the ac-coupled balanced photodetector BPD for outputting each dc component, and the dc output port and the ac output port are connected to the calculation processing unit, and so on, which will be specifically referred to the following description and will not be described herein again.
S102: and generating polarization state rotation information according to the direct current component and preset calibration parameters.
Based on the above example, the polarization rotation of the optical fiber may be equivalent to a jones matrix, and the polarization rotation information may be a jones matrix parameter. For example, after determining each dc component, a calculation may be performed based on each dc component to obtain polarization rotation information (if equivalent to a jones matrix, the polarization rotation information may be understood as a jones matrix parameter).
Of course, in other embodiments, the polarization rotation information may also be stokes matrix or mueller matrix parameters, etc.
S103: and reconstructing I, Q signals corresponding to the unpolarized crosstalk according to the polarization state rotation information and the alternating current component.
Based on the above analysis, an embodiment of the present application provides a signal reconstruction method, including: the method comprises the steps of collecting a direct current component and an alternating current component of a receiving end signal, generating Polarization State rotation information according to the direct current component and preset calibration parameters, reconstructing I, Q signals corresponding to non-Polarization crosstalk according to the Polarization State rotation information and the alternating current component, determining the Polarization State rotation information based on each direct current component, and reconstructing the signals based on the Polarization State rotation information and each alternating current component to obtain I, Q signals corresponding to the non-Polarization crosstalk.
In some embodiments, S103 may further include: and reconstructing I, Q signals corresponding to the non-polarization crosstalk according to the polarization state rotation information, the calibration parameters and the alternating current component.
In this embodiment, the accuracy of the reconstructed I, Q signal can be improved by introducing calibration parameters, taking into account the differences in the balanced photodetector BPDs.
In some embodiments, the calibration parameters include: direct current component calibration parameters and attenuation coefficient calibration parameters.
In some embodiments, the dc component calibration parameter is determined according to the power of the signal light and the power of the local oscillator light.
In some embodiments, the dc component calibration parameters include: the maximum value of the dc component; and/or, a minimum value of the direct current component.
In some embodiments, if the dc component includes a dc component of the I-path signal and a dc component of the Q-path signal, or the dc component includes a dc component of the I-path signal, a dc component of the Q-path signal, and a dc component of the Rd-path signal, the dc component calibration parameter includes: a maximum or minimum of the dc component.
In some embodiments, if the dc components include a dc component of the I-path signal, a dc component of the Q-path signal, and a dc component of the Rx-path signal, or the dc components include a dc component of the I-path signal, a dc component of the Q-path signal, and a dc component of the Ry-path signal, the dc component calibration parameter includes: the maximum value or the minimum value of the direct current component of the I path signal and the direct current component of the Q path signal, and the direct current component calibration parameters further comprise: the maximum value and the minimum value of the direct current component of the Rx path signal and the maximum value and the minimum value of the direct current component of the Ry path signal.
In some embodiments, if the power of the signal light at the transmitting end is greater than the power of the local oscillator light, the calibration parameter of the direct current component is the maximum value of the direct current component; and if the power of the signal light at the transmitting end is less than that of the local oscillation light, the direct current component calibration parameter is the minimum value of the direct current component.
In some embodiments, the polarization state rotation information includes first rotation information and second rotation information, and S102 includes:
s21: and generating first rotation information according to the direct current component and the attenuation coefficient calibration parameter.
S22: and generating second rotation information according to the direct current component, the direct current component calibration parameter and the first rotation information.
In some embodiments, the method for generating the dc component calibration parameter includes: and selecting the maximum value and/or the minimum value from the direct current components in the preset time period.
Wherein the time period may be set based on demand, experience, experiment, and the like.
According to another aspect of the embodiments of the present application, there is also provided a signal reconstruction apparatus for performing the method according to the above embodiments, that is, performing the method shown in fig. 3.
Referring to fig. 4, fig. 4 is a schematic diagram of a signal reconstruction apparatus according to an embodiment of the present application.
As shown in fig. 4, the apparatus includes:
and the acquisition module 11 is used for acquiring the direct current component and the alternating current component of the receiving end signal.
And the generating module 12 is configured to generate polarization rotation information according to the direct current component and a preset calibration parameter.
And the reconstruction module 13 is configured to reconstruct I, Q signals corresponding to the unpolarized crosstalk according to the polarization rotation information and the alternating current component.
In some embodiments, the reconstruction module 13 is configured to reconstruct I, Q signals corresponding to the unpolarized crosstalk according to the polarization rotation information, the calibration parameters, and the ac component.
In some embodiments, the calibration parameters include: direct current component calibration parameters and attenuation coefficient calibration parameters.
As can be seen in fig. 4, in some embodiments, the apparatus further comprises:
the determining module 14 is configured to determine a dc component calibration parameter according to the power of the signal light and the power of the local oscillator light.
In some embodiments, the dc component calibration parameters include: the maximum value of the dc component; and/or, a minimum value of the direct current component.
In some embodiments, if the dc component includes a dc component of the I-path signal and a dc component of the Q-path signal, or the dc component includes a dc component of the I-path signal, a dc component of the Q-path signal, and a dc component of the Rd-path signal, the dc component calibration parameter includes: a maximum or minimum of the dc component.
In some embodiments, if the dc components include a dc component of the I-path signal, a dc component of the Q-path signal, and a dc component of the Rx-path signal, or the dc components include a dc component of the I-path signal, a dc component of the Q-path signal, and a dc component of the Ry-path signal, the dc component calibration parameter includes: the maximum value or the minimum value of the direct current component of the I path signal and the direct current component of the Q path signal, and the direct current component calibration parameters further comprise: the maximum value and the minimum value of the direct current component of the Rx path signal and the maximum value and the minimum value of the direct current component of the Ry path signal.
In some embodiments, the determining module 14 is configured to determine the dc component calibration parameter as a maximum value of the dc component if the power of the signal light at the transmitting end is greater than the power of the local oscillator light; and if the power of the signal light at the transmitting end is smaller than that of the local oscillation light, determining the direct current component calibration parameter as the minimum value of the direct current component.
In some embodiments, the polarization rotation information includes first rotation information and second rotation information, and the generating module 12 is configured to generate the first rotation information according to the dc component and the attenuation coefficient calibration parameter; and generating second rotation information according to the direct current component, the direct current component calibration parameter and the first rotation information.
As can be seen in fig. 4, in some embodiments, the apparatus further comprises:
and the calibration module 15 is configured to select a maximum value and/or a minimum value from the dc components in the preset time period.
Wherein the time period may be set based on demand, experience, experiment, and the like.
According to another aspect of the embodiments of the present application, there is also provided a new polarization-multiplexed self-homodyne detection system.
Referring to fig. 5, fig. 5 is a schematic diagram of a polarization-multiplexed self-homodyne detection system according to an embodiment of the present application.
As shown in fig. 5, the system includes the polarization multiplexing self-homodyne detection system shown in fig. 2, and the description of related components can refer to the above example, which is not repeated herein, in this embodiment of the application, the system further includes a signal reconstruction device on the basis of the polarization multiplexing self-homodyne detection system in the related art, and the signal reconstruction device may specifically be a calculation processing unit shown in fig. 5, and the calculation processing unit is integrated in the optical digital signal processor in consideration of reasonable utilization of calculation resources.
As can be seen in fig. 6, in some embodiments, two ac-coupled balanced photodetectors in a polarization-multiplexed self-homodyne detection system are adapted as two balanced photodetectors with monitoring ports,
the system comprises a balance photoelectric detector with a monitoring port, a signal processing module and a signal processing module, wherein the balance photoelectric detector with the monitoring port is used for outputting a direct current component and an alternating current component of an I-path signal;
and the other balanced photoelectric detector with a monitoring port is used for outputting a direct current component and an alternating current component of the Q-path signal.
As can be seen in fig. 7 and 8, in some embodiments, the two ac-coupled balanced photodetectors in the polarization-multiplexed self-homodyne detection system are adjusted to be two balanced photodetectors with monitoring ports, and the polarization-multiplexed self-homodyne detection system further includes: a photodetector disposed between the polarization beam splitter rotator and the calculation processing unit, wherein,
the balanced photoelectric detector with the monitoring port is used for outputting a direct current component and an alternating current component of the I-path signal;
the other balanced photoelectric detector with a monitoring port is used for outputting a direct current component and an alternating current component of the Q-path signal;
the photoelectric detector is used for outputting a direct current component and an alternating current component of an Rx path signal; and/or, outputting the direct current component and the alternating current component of the Ry path signal;
wherein, the Rx path signal is a signal output by a photodetector from at least a part of optical signals separated from one of the two optical signals; the Ry path signal is a signal which is output by the photoelectric detector from at least part of the optical signal which is separated from the other optical signal in the two paths of optical signals.
As can be seen in fig. 9, in some embodiments, the two ac-coupled balanced photodetectors in the polarization-multiplexed self-homodyne detection system are adjusted to be two balanced photodetectors with monitoring ports, and the polarization-multiplexed self-homodyne detection system further includes: a balanced photodetector with a monitor port disposed between the polarization beam splitter rotator and the calculation processing unit, wherein,
a balanced photoelectric detector with a monitoring port connected behind the optical mixer is used for outputting a direct current component and an alternating current component of the I-path signal;
the other balanced photoelectric detector with a monitoring port connected behind the optical mixer is used for outputting a direct current component and an alternating current component of the Q-path signal;
the balance photoelectric detector with a monitoring port, which is arranged between the polarization beam splitting rotator and the calculation processing unit, is used for outputting a direct current component and an alternating current component of the Rd path signal;
the Rd path signal is at least part of optical signals separated from the two paths of optical signals and passes through an output signal of a balanced photoelectric detector with a monitoring port.
As can be seen in fig. 10 and 11, in some embodiments, the polarization-multiplexed self-homodyne detection system further includes: an optical mixer arranged between the polarization beam splitting rotator and the calculation processing unit, two balance photodetectors coupled by direct current, and two photodetectors arranged between the polarization beam splitting rotator and the calculation processing unit,
the optical mixer is used for mixing at least part of optical signals output by the polarization beam splitting rotator;
a DC-coupled balanced photodetector behind the optical mixer for outputting the DC component of the I-channel signal according to the mixed optical signal;
another DC-coupled balanced photodetector after the set optical mixer is used for outputting the DC component of the Q-path signal according to the optical signal after frequency mixing;
a photoelectric detector arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting the alternating current component of the Rx path signal and/or the alternating current component of the Ry path signal;
and the other photoelectric detector arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting the direct current component of the Rx path signal and/or the direct current component of the Ry path signal.
As can be seen in fig. 12, in some embodiments, the polarization-multiplexed self-homodyne detection system further includes: an optical mixer arranged between the polarization beam splitting rotator and the calculation processing unit, two DC-coupled balance photodetectors, a DC-coupled balance photodetector and an AC-coupled balance photodetector arranged between the polarization beam splitting rotator and the calculation processing unit,
the optical mixer is used for mixing at least part of optical signals output by the polarization beam splitting rotator;
a DC-coupled balanced photodetector behind the optical mixer for outputting the DC component of the I-channel signal according to the mixed optical signal;
another DC-coupled balanced photodetector after the set optical mixer is used for outputting the DC component of the Q-path signal according to the optical signal after frequency mixing;
the balance photoelectric detector of alternating current coupling arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting an alternating current component of the Rd path signal;
and the direct-current coupled balance photoelectric detector arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting a direct-current component of the Rd path signal.
As can be seen in fig. 13 and 14, in some embodiments, the polarization-multiplexed self-homodyne detection system further includes: two DC-coupled balanced photodetectors arranged between the optical mixer and the calculation processing unit, and two photodetectors arranged between the polarization beam splitter rotator and the calculation processing unit,
a DC-coupled balanced photodetector arranged between the optical mixer and the calculation processing unit for outputting the DC component of the I-path signal;
the other direct-current coupled balanced photoelectric detector is arranged between the optical mixer and the calculation processing unit and is used for outputting a direct-current component of the Q-path signal;
a photoelectric detector arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting the alternating current component of the Rx path signal and/or the alternating current component of the Ry path signal;
and the other photoelectric detector arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting the direct current component of the Rx path signal and/or the direct current component of the Ry path signal.
As can be seen in fig. 15 and 16, in some embodiments, two ac-coupled balanced photodetectors in the polarization-multiplexed self-homodyne detection system are adjusted to two dc-coupled balanced photodetectors, and the polarization-multiplexed self-homodyne detection system further includes: a photodetector disposed between the polarization beam splitter rotator and the calculation processing unit, wherein,
a DC-coupled balanced photodetector for outputting the DC component and the AC component of the I-path signal;
the other direct-current coupled balanced photoelectric detector is used for outputting a direct-current component and an alternating-current component of the Q-path signal;
the photoelectric detector is used for outputting a direct current component and an alternating current component of an Rx path signal; and/or outputting the direct current component and the alternating current component of the Ry path signal.
As can be seen in fig. 17, in some embodiments, two ac-coupled balanced photodetectors in the polarization-multiplexed self-homodyne detection system are adjusted to two dc-coupled balanced photodetectors, and the polarization-multiplexed self-homodyne detection system further includes: a DC-coupled balanced photodetector disposed between the polarization beam splitter rotator and the computational processing unit, wherein,
the adjusted DC coupled balance photoelectric detector is used for outputting a DC component and an AC component of the I-path signal;
the adjusted other DC coupled balanced photoelectric detector is used for outputting a DC component and an AC component of the Q-path signal;
and the direct-current coupled balance photoelectric detector arranged between the polarization beam splitting rotator and the calculation processing unit is used for outputting a direct-current component and an alternating-current component of the Rd-path signal.
For the reader to more deeply understand the technical solution of the embodiments of the present application, the embodiments of the present application will now be described in more detail by taking polarization rotation information as an example of the jones matrix parameter, but it should be noted that the following examples are only for illustrative purposes and are not to be construed as limiting the scope of the embodiments of the present application.
As can be seen from the above examples, in the related art, the balanced photodetector BPDs employed are ac-coupled balanced photodetector BPDs, such as the balanced photodetector BPDs 1 and BPD2 shown in fig. 2. Although in the related art self-homodyne detection system, the balanced photodetector BPD used is an ac-coupled balanced photodetector BPD, in other technical fields, the balanced photodetector BPD may further include a dc-coupled balanced photodetector BPD and a balanced photodetector BPD with a monitoring port, and in order to distinguish different types of balanced photodetector BPDs, in the following embodiments, the balanced photodetector BPD with a monitoring port is realized by expressions of "first", "second", and "third", and is characterized by using the first balanced photodetector BPD, wherein the monitoring port is a dc output port for outputting a dc component in the embodiment of the present application, and the first balanced photodetector includes a radio frequency output port in addition to the monitoring port for outputting an ac component in the embodiment of the present application; characterizing by a second balanced photoelectric detector BPD, and carrying out direct-current coupling on the balanced photoelectric detector BPD; and characterizing by using a third balanced photoelectric detector BPD, and carrying out AC coupling on the balanced photoelectric detector BPD.
In addition, the balanced photodetector BPD may be divided into a high-speed balanced photodetector BPD and a low-speed balanced photodetector BPD. In the embodiment of the present application, during the explanation of the embodiment, the high-speed balanced photodetector BPD and the low-speed balanced photodetector BPD are not specifically subdivided, and in the practical application process, the high-speed balanced photodetector BPD or the low-speed balanced photodetector BPD may be selected according to the corresponding service requirements, such as bandwidth requirements, for example, in the embodiment of the present application, when the balanced photodetector BPD is only used for outputting a dc component, the low-speed balanced photodetector BPD may be selected, and when the balanced photodetector BPD at least needs to output an ac component, the high-speed balanced photodetector BPD may be selected.
Similarly, the Photodetector (PD) may include an ac-coupled Photodetector PD, a dc-coupled Photodetector PD, and may further include a Photodetector PD with a monitoring port, and in order to distinguish different types of photodetectors PD, in this embodiment of the present application, the Photodetector PD with the monitoring port is implemented by expressions of "first", "second", and "third", and is characterized by using a first Photodetector PD, where the monitoring port is a dc output port for outputting a dc component in this embodiment of the present application, and the first Photodetector further includes a radio frequency output port in addition to the monitoring port, for outputting an ac component in this embodiment of the present application; characterizing the direct-current coupled photoelectric detector PD by adopting a second photoelectric detector PD; and characterizing the AC-coupled photodetector PD by using a third photodetector PD.
In addition, the photodetector PD can be divided into a high-speed photodetector PD and a low-speed photodetector PD. In the embodiment of the present application, during the explanation of the embodiment, the high-speed photodetector PD and the low-speed photodetector PD are not specifically subdivided, and in the practical application process, the high-speed photodetector PD or the low-speed photodetector PD may be selected according to corresponding service requirements, such as bandwidth requirements, for example, in the embodiment of the present application, when the photodetector PD is only used for outputting a dc component, the low-speed photodetector PD may be selected, and when the photodetector PD at least needs to output an ac component, the high-speed photodetector PD may be selected.
Example 1
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 7, in the polarization multiplexing self-homodyne detection system according to the embodiment of the present application, with respect to fig. 2, two third balanced photodetectors BPD as in fig. 2 may be adjusted to two first balanced photodetectors BPD as in fig. 7, such as BPD1 and BPD2, and a calculation processing unit may be disposed in the optical signal digital processor ODSP, and the E output by the polarization beam splitter rotator PSR may be adjusted by the beam splitter PSxA part of the light is branched off and is directly and/or indirectly connected to the calculation processing unit through the first photodetector PD, and the two first balanced photodetectors (i.e., the BPDs 1 and 2 in fig. 7) and the first photodetector PD are directly and/or indirectly connected to the calculation processing unit, respectively.
As shown in fig. 7, if the direct current component of the I-path signal output from the direct current output port DC1 isThe direct current component of the Q-path signal output by the direct current output port DC2 isThe DC component of the Rx path signal output by the DC output port DC3 isMeanwhile, the two first balanced photodetectors BPD1 and BPD2 may also output the ac component I through the RF output ports RF1 and RF2 respectively corresponding to each otherACAnd QACAnd the first photodetector PD may also output the alternating current component R through the radio frequency output port RF3xACThe calculation processing unit may be based onIAC、QACAnd RxACThe output signal is reconstructed and is the signal without polarization crosstalk.
The method for reconstructing the output signal by the computing processing unit comprises the following steps:
s1: and calibrating the parameters of the polarization multiplexing self-homodyne detection system to obtain calibration parameters.
For example, calibration parameters include: maximum or minimum DC component of I-path signal and Q-path signalAnd the ratio of the attenuation coefficient calibration parameters of the I path signal and the Q path signal outputSpecifically selecting the maximum direct current component or the minimum direct current component, depending on the power of the signal light at the transmitting end and the power of the local oscillator light; the calibration parameters further include: maximum direct current component of Rx path signal output by direct current output port DC3And minimum DC componentAnd the ratio of the attenuation coefficient calibration parameters of the Rx path signal, the I path signal and the Q path signal
Specifically, the calibration method may be to count a period of time and detect the maximum dc component or the minimum dc component of the I-path signal and the Q-path signal and the maximum dc component and the minimum dc component of the Rx-path signal according to the random change of the polarization state of the optical fiber link.
S2: according to the detected current I-path signal DC componentDC component of Q-path signalAnd the DC component of the Rx path signalAnd calculating to obtain a real-time value of the Jones matrix parameter.
Specifically, the real-time values of the jones matrix parameters may be calculated by using formula (1) and formula (2), or formula (1) and formula (3), where formula (1), formula (2), and formula (3) are as follows:
or
Or
Wherein k and n are preset parameters. In an initialization stage (i.e., a stage of not transmitting real service data), determining parameters (delta + beta) and 2 theta of the Jones matrix in a mode of sending a section of training sequence data; in the system operation stage, a unique solution of the jones matrix parameter (δ + β) of the next set of sample data may be determined according to formula (1) and the rate of change of the polarization state and the result obtained from the previous set of sample data, and a unique solution of the jones matrix parameter 2 θ of the next set of sample data may be determined from formula (2) or formula (3) in combination with formula (4).
S3: according to the obtained Jones matrix parameter, the calibration parameter and the alternating current component I of the I-path signalACRoute QAC component Q of signalACAnd the AC component R of the Rx path signalxACAnd reconstructing a signal without polarization crosstalk.
In some embodiments, the signal I without polarization crosstalk may be determined according to equations (5) and (6)rec2And Qrec2：
Wherein the content of the first and second substances,b＝cos(δ+β)，c＝sin(δ+β)。
the embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
Example 2
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 8, in the polarization multiplexing self-homodyne detection system according to the embodiment of the present application, with respect to fig. 2, two third balanced photodetectors BPD as shown in fig. 2 may be adjusted to two first balanced photodetectors BPD as shown in fig. 8, such as BPD1 and BPD2, and a calculation processing unit may be disposed in the optical signal digital processor ODSP, and the E output from the polarization beam splitter rotator PSR is output by the beam splitter PSyA part of the light is branched off and connected directly and/or indirectly to the calculation processing unit through the first photodetector PD, and the two first balanced photodetectors (i.e., the BPDs 1 and 2 in fig. 8) and the first photodetector PD are connected directly and/or indirectly to the calculation processing unit, respectively.
As shown in fig. 8, if the direct current component of the I-path signal output from the direct current output port DC1 isThe direct current component of the Q-path signal output by the direct current output port DC2 isAnd the direct current component of the Ry path signal output by the direct current output port DC3 isMeanwhile, the two first balanced photodetectors BPD1 and BPD2 may also output the ac component I through the RF output ports RF1 and RF2 respectively corresponding to each otherACAnd QACAnd the first photodetector PD may also output the alternating current component R through the radio frequency output port RF3yACThe calculation processing unit may be based onIAC、QACAnd RyACThe output signal is reconstructed and is the signal without polarization crosstalk.
The method for reconstructing the output signal by the computing processing unit comprises the following steps:
s11: and calibrating the parameters of the polarization multiplexing self-homodyne detection system to obtain calibration parameters.
For example, calibration parameters include: maximum or minimum DC component of I-path signal and Q-path signalAnd the ratio of attenuation coefficients of the I-path signal and the Q-path signalSpecifically selecting the maximum direct current component or the minimum direct current component, depending on the power of the signal light at the transmitting end and the power of the local oscillator light; the calibration parameters further include: maximum direct current component of Ry path signal output by direct current output port DC3And minimum DC componentAnd the ratio of Ry path signal to the attenuation coefficient calibration parameter outputted by I path signal and Q path signal
Specifically, the calibration method may be to count a period of time and detect the maximum dc component or the minimum dc component output by the I path signal and the Q path signal and the maximum dc component and the minimum dc component of the Ry path signal according to the random change of the polarization state of the optical fiber link.
S12: according to the detected DC component of the current I-path signalDC component of Q-path signalAnd the DC component value of Ry pathAnd calculating to obtain a real-time value of the Jones matrix parameter.
Compared with the embodiment 1, the formula (4) for determining the jones matrix parameter 2 theta is modified into the formula (7):
s13: according to the obtained Jones matrix parameter, the calibration parameter and the alternating current component I of the I-path signalACAC component Q of Q path signalACAnd the alternating component R of the Ry path signalyACAnd constructing a signal without crosstalk.
In some embodiments, the crosstalk-free signal may be determined according to equation (8) and equation (9):
wherein the content of the first and second substances,b＝cos(δ+β)，c＝sin(δ+β)。
the embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
Example 3
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 6, in the polarization multiplexing self-homodyne detection system according to the embodiment of the present application, with respect to fig. 2, two third balanced photodetectors BPD as in fig. 2 may be adjusted to two first balanced photodetectors BPD as in fig. 6, such as the BPD1 and the BPD2, and a calculation processing unit may be disposed in the optical signal digital processor ODSP, and the two first balanced photodetectors (i.e., the BPD1 and the BPD2 in fig. 6) are directly and/or indirectly connected to the calculation processing unit.
As shown in fig. 6, if the direct current component of the I-path signal output from the direct current output port DC1 isThe direct current component of the Q-path signal output by the direct current output port DC2 isMeanwhile, the first balanced photodetector BPD1 may also output the alternating current component I through the radio frequency output port RF1ACThe first balanced photodetector BPD2 may also output an ac component Q via the RF output port RF2ACThen calculateThe processing unit can be based onIACAnd QACThe output signal is reconstructed and is the signal without polarization crosstalk.
The method for reconstructing the output signal by the computing processing unit comprises the following steps:
s21: and calibrating the parameters of the polarization multiplexing self-homodyne detection system to obtain calibration parameters.
For example, the calibrated parameters include: maximum or minimum DC component of I-path signal and Q-path signalAnd the ratio gamma of the attenuation coefficient calibration parameters of the I path signal and the Q path signal output1/γ2The specific selection of the maximum dc component or the minimum dc component depends on the power of the signal light and the power of the local oscillator light.
Specifically, the calibration method may be to count a period of time and detect the maximum dc component or the minimum dc component of the I-path signal and the Q-path signal according to the random change of the polarization state of the optical fiber link.
S22: according to the detected DC component of the current I-path signalDC component of Q-path signalAnd calculating to obtain a real-time value of the Jones matrix parameter.
For a specific calculation method, the above exemplary formulas (1), (2) and (3) can be referred to, and details are not repeated here.
S23: according to the obtained Jones matrix parameter, the calibration parameter and the alternating current component I of the I-path signalACAC component Q of Q path signalACAnd constructing a signal without crosstalk.
In some embodiments, the crosstalk-free signal may be determined according to equation (10) and equation (11):
Irec1＝IAC+2abx1 (10)
wherein the content of the first and second substances,a＝sin2θ，b＝cos(δ+β)，c＝sin(δ+β)。
the method and the device for determining the Jones matrix parameter are applicable to mPSK constant modulus modulation code types, and the unique solution of the Jones matrix parameter can be determined in an auxiliary mode by periodically inserting the training sequence in the operation process of the polarization multiplexing self-homodyne detection system.
Example 4
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 9, in the polarization multiplexing self-homodyne detection system according to the embodiment of the present application, with respect to fig. 2, two third balanced photodetectors BPD as in fig. 2 may be adjusted to two first balanced photodetectors BPD as in fig. 9, such as the BPD1 and the BPD2, and the two first balanced photodetectors BPD1 and the BPD2 are directly and/or indirectly connected to the calculation processing unit. And as shown in fig. 9, the direct current component of the I-path signal outputted from the direct current output port DC1 isThe direct current component of the Q-path signal output by the direct current output port DC2 isMeanwhile, the two first balanced photodetectors BPD1 and BPD2 may also output the ac component I through the RF output ports RF1 and RF2 respectively corresponding to each otherACAnd QAC. And output after the polarization beam splitter rotator PSR by the beam splitter PSExAnd EyThe paths of the light are respectively divided into a part of light, the divided part of light is input into a first balanced photoelectric detector BPD3, the first balanced photoelectric detector BPD3 is directly and/or indirectly connected with the calculation processing unit, and the first balanced photoelectric detector BPD3 outputs a direct current component through a direct current output port DC3And the first balanced photodetector BPD3 may further output an alternating current component R through the radio frequency output port RF3dAC。
Compared with the embodiment 1, the formula (4) for determining the jones matrix parameter 2 theta is modified into the formula (12):
wherein the calculation processing unit can be based onIAC、QACAndand RdACThe method of reconstructing the output signal may be implemented by equation (13) and equation (14):
wherein the content of the first and second substances,b＝cos(δ+β)，c＝sin(δ+β)，RdAC＝2y3·cos2θ-2sin2θ·x4。
example 5
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 10 and fig. 11, in the polarization multiplexing self-homodyne detection system of the embodiment of the present application, with respect to fig. 2, after the polarization splitting rotator PSR, the polarization multiplexing self-homodyne detection system can be connected to an optical mixer (such as the splitters PS2 and PS3 shown in fig. 10 and fig. 11) through two splitters PS, and since one optical mixer already exists in fig. 2, an optical mixer is introduced in the embodiment, in order to distinguish the two optical mixers, the original optical mixer is labeled as the optical mixer 1, the newly added optical mixer is labeled as the optical mixer 2, and the optical mixer 2 is connected to two second balanced photodetectors (i.e., the BPD3 and the BPD4 in fig. 10 and fig. 11). And E outputted after the polarization beam splitter rotator PSR is passed through the beam splitter PS1xOr EyA portion of the light is branched and connected to a second photodetector PD1 and a third photodetector PD3 (exemplarily shown in fig. 10 at Rx and fig. 11 at Ry) via a splitter PS 4. Similarly, the BPD1, the BPD2, the PD1 and the PD2 in fig. 10 and 11 are directly and/or indirectly connected to the calculation processing unit.
As shown in fig. 10 and 11, if the second balanced photodetector BPD3 after the optical mixer is used to output the dc componentThe second balanced photodetector BPD4 is used for outputting a DC componentThe second photodetector PD1 is used for outputting a DC componentOrThe third photodetector PD2 is used for outputting an alternating current component RxACOr RyACAnd the third balance photoelectricThe detector BPD1 is used for outputting an alternating current component IACAnd the third balanced photodetector BPD2 is used for outputting an alternating current component QACThe calculation processing unit may be based onIAC、QACAnd RxACReconstructing the output signal, or the computational processing unit may be based onIAC、QACAnd RyACThe output signal is reconstructed and is the signal without polarization crosstalk.
Wherein the calculation processing unit is based onIAC、QACAnd RxACThe method for reconstructing the output signal can be seen in example 1, and the calculation processing unit can be based onIAC、QACAnd RyACThe method for reconstructing the output signal can be seen in embodiment 2, and is not described herein.
The embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
Example 6
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 12, in the polarization multiplexing self-homodyne detection system of the embodiment of the present application, with respect to fig. 2, after the polarization beam splitter rotator PSR, the polarization beam splitter PSR can be connected to the optical mixers (such as the optical splitters PS2 and PS4 shown in fig. 12) through two optical splitters PS, and since one optical mixer already exists in fig. 2, one optical mixer is introduced in the embodiment, and in order to input two optical mixersThe optical mixers are distinguished, the original optical mixer is marked as an optical mixer 1, the newly added optical mixer is marked as an optical mixer 2, and the optical mixer 2 is connected with two second balanced photodetectors (i.e., the BPD3 and the BPD4 of fig. 12). And E outputted after the polarization beam splitter rotator PSR is passed through the beam splitters PS1 and PS3xAnd EyThe split optical connections are connected to a third balanced photodetector BPD6, and the two split lights (i.e., the two split lights from PS1 and PS3) are split to a second balanced photodetector BPD5 by the optical splitters PS5 and PS6, respectively. Similarly, the BPDs 1, 2, 3, 4, 5 and 6 in fig. 12 are directly and/or indirectly connected to the calculation processing unit.
As shown in fig. 12, if the second balanced photodetector BPD3 after the optical mixer is used to output the dc componentThe second balanced photodetector BPD4 is used for outputting a DC componentThe second balanced photodetector BPD5 is used for outputting a DC componentThe third balanced photodetector BPD6 is used for outputting an alternating current component RdACAnd a third balanced photodetector BPD1 for outputting an alternating current component IACAnd the third balanced photodetector BPD2 is used for outputting an alternating current component QACThe calculation processing unit may be based on IAC、QACAnd RdACThe output signal is reconstructed.
Wherein the calculation processing unit can be based onIAC、QACAnd RdACThe method for reconstructing the output signal can be seen in embodiment 4, and is not described herein.
The embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
Example 7
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 13 and 14, in the polarization multiplexing self-homodyne detection system according to the embodiment of the present application, with respect to fig. 2, four paths of light can be dropped by four optical splitters PS after the optical mixer to connect two second balanced photodetectors BPD (i.e., the BPD3 and the BPD4 in fig. 13 and 14), respectively. And E outputted after the polarization beam splitter rotator PSR is passed through the beam splitter PS1xOr EyA portion of the light is split and is respectively connected to the second photodetector PD1 and the third photodetector PD2 through a splitter PS2 (where Rx is exemplarily shown in fig. 13 and Ry is exemplarily shown in fig. 14). Similarly, the BPDs 1, 2, 3, 4, 1 and 2 in fig. 13 and 14 are directly and/or indirectly connected to the calculation processing unit.
As shown in fig. 13 and 14, if the second balanced photodetector BPD3 after the optical mixer is used to output the dc component of the I-path signalThe second balanced photoelectric detector BPD4 is used for outputting the direct current component of the Q-path signalAnd the second photodetector PD1 is used to output a dc componentOrThe third photodetector PD2 is used for outputting an alternating current component RxACOr RyACAnd a third balanced photodetector BPD1 for outputting an alternating current component IACAnd the third balanced photodetector BPD2 is used for outputting an alternating current component QACThe calculation processing unit may be based onIAC、QACAnd RxACReconstructing the output signal, or the computational processing unit may be based onIAC、QACAnd RyACThe output signal is reconstructed and is the signal without polarization crosstalk.
Wherein the calculation processing unit is based onIAC、QACAnd RxACThe method for reconstructing the output signal can be seen in example 1, and the calculation processing unit can be based onIAC、QACAnd RyACThe method for reconstructing the output signal can be seen in embodiment 2, and is not described herein.
The embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
Example 8
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 15 and 16, in the polarization multiplexing self-homodyne detection system of the embodiment of the present application, with respect to fig. 2, the two third balanced photodetectors BPD are adjusted to be the two second balanced photodetectors BPD (e.g., the BPD1 and the BPD2 in fig. 15 and 16), ande output after polarization beam splitter rotator PSR is passed through a beam splitter PS (e.g., PS1 in FIGS. 15 and 16)xOr EyA part of the light is divided and connected to a second photodetector PD. Similarly, the BPDs 1, BPD2, and PD in fig. 15 and 16 are directly and/or indirectly connected to the calculation processing unit.
That is, as shown in fig. 15 and 16, the two second balanced photodetectors BPD1 and BPD2 after the optical mixer output the alternating current component IACAnd QACMeanwhile, the circuit can be used for respectively outputting direct current components of the I-path signalsAnd the DC component of the Q-path signalThe second photodetector PD is used for outputting the DC component of the Rx path signalAnd an alternating current component RxACOr, for outputting the DC component of the Ry signalAnd an alternating current component RyAC(wherein Rx is exemplarily shown in FIG. 15 and Ry is exemplarily shown in FIG. 16).
The calculation processing unit may be based onIAC、QACAnd RxACReconstructing the output signal, or the computational processing unit may be based onIAC、QACAnd RyACThe output signal is reconstructed.
Wherein the calculation processing unit is based onIAC、QACAnd RxACThe method for reconstructing the output signal can be seen in example 1, and the calculation processing unit can be based onIAC、QACAnd RyACThe method for reconstructing the output signal can be seen in embodiment 2, and is not described herein.
The embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
Example 9
In order to realize that the signal output by the receiving end is a signal without polarization crosstalk, the embodiment of the present application provides a new polarization multiplexing self-homodyne detection system on the basis of fig. 2.
As shown in fig. 17, in the polarization multiplexing self-homodyne detection system according to the embodiment of the present application, with respect to fig. 2, the two third balanced photodetectors BPD are adjusted to two second balanced photodetectors BPD (e.g., the BPD1 and the BPD2 in fig. 17), and the E output after the polarization beam splitting rotator PSR is divided by the beam splitter PS (e.g., the PS1 and the PS2 in fig. 17)xAnd EyThe paths are each divided into a portion of light and followed by a second balanced photodetector BPD (such as BPD3 in fig. 17). Similarly, the BPD1, BPD2, and BPD3 in fig. 17 are directly and/or indirectly connected to the calculation processing unit.
That is, as shown in fig. 17, the two second balanced photodetectors BPD1 and BPD2 after the optical mixer output the alternating current component IACAnd QACMeanwhile, the circuit can be used for respectively outputting direct current components of the I-path signalsAnd the DC component of the Q-path signalThe second balanced photoelectric detector BPD3 is used for outputting a direct current component of the Rd path signalAnd an alternating current component RdAC。
The calculation processing unit mayIAC、QACAnd RdACThe output signal is reconstructed and is the signal without polarization crosstalk.
Wherein the calculation processing unit can be based onIAC、QACAnd RdACThe method for reconstructing the output signal can be seen in embodiment 4, and is not described herein.
The embodiment of the application is suitable for all modulation code types, and the polarization multiplexing self-homodyne detection system does not need to insert training sequences periodically in the operation process.
For the balanced photodetector with the monitoring port (i.e., the first balanced photodetector) and the photodetector with the monitoring port (i.e., the first photodetector), reference may be specifically made to fig. 18, and specific principles thereof may be referred to in the related art, which is not described herein again.
For the dc-coupled balanced photodetector (i.e., the second balanced photodetector) and the dc-coupled photodetector (i.e., the second photodetector), reference may be specifically made to fig. 19, and for a specific principle thereof, reference may be made to related technologies, which are not described herein again.
According to another aspect of the embodiments of the present application, there is also provided a computer storage medium having stored thereon computer instructions, which, when executed by a processor, cause the method according to any of the above embodiments to be performed, such that the method shown in fig. 3 is performed.
According to another aspect of the embodiments of the present application, there is also provided a signal reconstruction apparatus, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores computer instructions executable by the at least one processor, the computer instructions being executable by the at least one processor to cause the method of any of the above embodiments to be performed, e.g., the method of fig. 3.
According to another aspect of the embodiments of the present application, there is also provided a communication apparatus, including:
the input interface is used for acquiring a direct current component and an alternating current component of a receiving end signal;
logic circuitry configured to perform a method as described in any of the above embodiments, for example, the method shown in fig. 3, to obtain I, Q signals corresponding to unpolarized crosstalk;
and the output interface is used for outputting I, Q signals corresponding to the unpolarized crosstalk.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present disclosure.
In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It should also be understood that, in the embodiments of the present disclosure, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure.
While the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
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