Signal generating device and method, communication device and method
阅读说明：本技术 信号发生装置及方法、通信装置及方法 (Signal generating device and method, communication device and method ) 是由 金亚 刘宇 陈寅芳 齐艺超 陈伟 李明 祝宁华 于 2021-07-26 设计创作，主要内容包括：本公开提供了一种信号发生装置及方法、通信装置及方法,应用于通信技术领域,利用多个强度调制器在两个支路上产生波长互补的频移键控载波信号,该载波信号波长在两个支路间的分配受预设伪随机序列控制,实现用户数据在不同波长对应的信道间随机跳变,有效地防止信息泄露与非法窃听。(The invention provides a signal generating device and method, a communication device and method, which are applied to the technical field of communication.)
1. A signal generating device, comprising:
the optical fiber Bragg grating light source comprises a laser, a Mach-Zehnder modulator, a first optical fiber Bragg grating, a second optical fiber Bragg grating and three groups of intensity modulators;
the laser is used for generating an optical carrier wave with a single wavelength;
the Mach-Zehnder modulator is used for modulating the optical carrier under the modulation of a fixed-frequency radio-frequency signal to obtain modulation signals with different wavelengths, and the modulation signals comprise a first optical signal and a second optical signal;
the first fiber Bragg grating is used for filtering the modulation signal to obtain a first optical signal;
the second fiber Bragg grating is used for filtering the modulation signal to obtain a second optical signal;
two groups of intensity modulators in the three groups of intensity modulators are respectively used for generating frequency shift keying light waves with complementary wavelengths under the control of a preset pseudorandom sequence based on the first optical signal and the second optical signal, and the other group of intensity modulators in the three groups of intensity modulators is used for modulating user data onto the frequency shift keying light waves with complementary wavelengths to obtain an optical carrier containing the user data.
2. Signal generation device according to claim 1,
the input end of the first group of intensity modulators of the two groups of intensity modulators is connected with the output end of the first fiber Bragg grating, and the input end of the second group of intensity modulators of the two groups of intensity modulators is connected with the output end of the second fiber Bragg grating;
the first set of intensity modulators comprises a first intensity modulator and a second intensity modulator, the first intensity modulator and the second intensity modulator connected in parallel, the second set of intensity modulators comprises a third intensity modulator and a fourth intensity modulator, the third intensity modulator and the fourth intensity modulator connected in parallel;
the output end of the first intensity modulator is connected in parallel with the output end of the third intensity modulator, and the output end of the second intensity modulator is connected in parallel with the output end of the fourth intensity modulator.
3. Signal generation device according to claim 1,
the output end of the second intensity modulator is connected with the input end of the fifth intensity modulator, and the output end of the third intensity modulator is connected with the input end of the sixth intensity modulator.
4. The signal generating apparatus of claim 1 wherein the optical carrier comprises a first optical carrier and a second optical carrier, and the other of the three sets of intensity modulators comprises a fifth intensity modulator and a sixth intensity modulator;
the fifth intensity modulator is configured to modulate the first user data onto one of the frequency shift keying optical waves with complementary wavelengths, so as to obtain a first optical carrier containing the first user data;
and the sixth intensity modulator is configured to modulate the second user data onto another one of the frequency shift keying optical waves with complementary wavelengths, so as to obtain a second optical carrier containing the second user data.
5. A communications apparatus, comprising:
the signal generating apparatus, the signal receiving apparatus according to any one of claims 1 to 4;
the signal receiving device comprises an array waveguide grating, two groups of intensity modulators, a first photoelectric detector and a second photoelectric detector;
the arrayed waveguide grating is used for demultiplexing the optical carrier containing the user data to obtain a first optical signal and a second optical signal corresponding to different wavelengths;
one of the two sets of intensity modulators is configured to enable the first optical signal to generate a frequency shift keying optical wave containing first user data under the control of a preset pseudorandom sequence, and the other of the two sets of intensity modulators is configured to enable the second optical signal to generate a frequency shift keying optical wave containing second user data under the control of the preset pseudorandom sequence, wherein the frequency shift keying optical wave containing the first user data and the frequency shift keying optical wave containing the second user data are complementary in wavelength;
the first photodetector is used for converting the frequency shift keying light wave containing the first user data into a first electric signal containing the first user data;
the second photodetector is configured to convert the frequency shift keyed light wave containing the second user data into a second electrical signal containing the second user data.
6. The communication device of claim 5,
the output end of the arrayed waveguide grating is connected with the two groups of intensity modulators, and the two groups of intensity modulators are connected in parallel;
one of the two sets of intensity modulators comprises a seventh intensity modulator and an eighth intensity modulator, the other of the two sets of intensity modulators comprises a ninth intensity modulator and a tenth intensity modulator, the output end of the seventh intensity modulator is connected in parallel with the output end of the ninth intensity modulator, the output end of the tenth intensity modulator is connected in parallel with the output end of the eighth intensity modulator, the output end of the eighth intensity modulator is connected with the first photoelectric detector, and the output end of the ninth intensity modulator is connected with the second photoelectric detector.
7. The communication device according to claim 5 or 6, further comprising a fiber amplifier;
the optical fiber amplifier is connected with the signal generating device and the signal receiving device.
8. A method of signal generation, comprising:
generating an optical carrier;
under the modulation of a fixed-frequency radio frequency signal, modulating the optical carrier to obtain modulation signals with different wavelengths, wherein the modulation signals comprise a first optical signal and a second optical signal;
filtering the modulation signal to obtain a first optical signal, and filtering the modulation signal to obtain a second optical signal;
generating frequency shift keying light waves with complementary wavelengths under the control of a preset pseudorandom sequence on the basis of the first optical signal and the second optical signal;
and modulating the user data to the frequency shift keying light wave with the complementary wavelength to obtain an optical carrier containing the user data.
9. A method of communication, comprising:
demultiplexing an optical carrier containing user data to obtain a first optical signal containing first user data and a second optical signal containing second user data;
enabling the first optical signal to generate a frequency shift keying optical wave containing first user data under the control of a preset pseudorandom sequence, and enabling the second optical signal to generate a frequency shift keying optical wave containing second user data under the control of the preset pseudorandom sequence, wherein the frequency shift keying optical wave containing the first user data and the frequency shift keying optical wave containing the second user data are complementary in wavelength;
converting the frequency-shift-keyed light wave containing the first user data to a first electrical signal containing the first user data, and converting the frequency-shift-keyed light wave containing the second user data to a second electrical signal containing the second user data.
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal generating apparatus and method, and a communication apparatus and method.
Background
The optical fiber communication technology has been developed rapidly in recent years, and the social progress and the economic development are greatly promoted. However, with the frequent occurrence of user information leakage events around the world in recent years, the risk that user data is stolen by an illegal third party in transmission is increasing, and the optical communication security technology is receiving increasing attention.
Among existing secure communication mechanisms, encryption of user data using an algorithm at a software layer is the most common method. However, with the tremendous increase in computing power, the security of this approach is beginning to be compromised. Therefore, more and more researchers are focusing on physical layer security technologies. The physical layer security technology is to enhance the security of communication by appropriately encoding and processing signals using the physical characteristics of the communication channel. Optical frequency hopping is one of physical layer security technologies, and data hiding is mainly realized by hopping digital signals among different channels. User data is first divided into segments in the time domain, and then the segments are transmitted over different physical channels under the control of a pseudo-random sequence.
Disclosure of Invention
The present application is directed to a signal generating apparatus and method, and a communication apparatus and method, which can implement random hopping of user data between channels corresponding to different wavelengths, and effectively prevent information leakage and illegal eavesdropping.
In order to achieve the above object, a first aspect of embodiments of the present application provides a signal generating apparatus, including:
the optical fiber Bragg grating light source comprises a laser, a Mach-Zehnder modulator, a first optical fiber Bragg grating, a second optical fiber Bragg grating and three groups of intensity modulators;
the laser is used for generating an optical carrier wave with a single wavelength;
the Mach-Zehnder modulator is used for modulating the optical carrier under the modulation of a fixed-frequency radio-frequency signal to obtain modulation signals with different wavelengths, and the modulation signals comprise a first optical signal and a second optical signal;
the first fiber Bragg grating is used for filtering the modulation signal to obtain a first optical signal;
the second fiber Bragg grating is used for filtering the modulation signal to obtain a second optical signal;
two groups of intensity modulators in the three groups of intensity modulators are respectively used for generating frequency shift keying light waves with complementary wavelengths under the control of a preset pseudorandom sequence based on the first optical signal and the second optical signal, and the other group of intensity modulators in the three groups of intensity modulators is used for modulating user data onto the frequency shift keying light waves with complementary wavelengths to obtain an optical carrier containing the user data.
Optionally, an input end of a first group of intensity modulators of the two groups of intensity modulators is connected to an output end of the first fiber bragg grating, and an input end of a second group of intensity modulators of the two groups of intensity modulators is connected to an output end of the second fiber bragg grating;
the first set of intensity modulators comprises a first intensity modulator and a second intensity modulator, the first intensity modulator and the second intensity modulator connected in parallel, the second set of intensity modulators comprises a third intensity modulator and a fourth intensity modulator, the third intensity modulator and the fourth intensity modulator connected in parallel;
the output end of the first intensity modulator is connected in parallel with the output end of the third intensity modulator, and the output end of the second intensity modulator is connected in parallel with the output end of the fourth intensity modulator.
Optionally, an output end of the second intensity modulator is connected to an input end of the fifth intensity modulator, and an output end of the third intensity modulator is connected to an input end of the sixth intensity modulator.
Optionally, the optical carrier includes a first optical carrier and a second optical carrier, and another set of intensity modulators in the three sets of intensity modulators includes a fifth intensity modulator and a sixth intensity modulator;
the fifth intensity modulator is configured to modulate the first user data onto one of the frequency shift keying optical waves with complementary wavelengths, so as to obtain a first optical signal containing the first user data;
and the sixth intensity modulator is configured to modulate the second user data onto another one of the frequency shift keying light waves with complementary wavelengths, so as to obtain a second optical signal containing the second user data.
A second aspect of the embodiments of the present application provides a communication apparatus, including:
a signal generating apparatus, a signal receiving apparatus as provided in the first aspect;
the signal receiving device comprises an array waveguide grating, two groups of intensity modulators, a first photoelectric detector and a second photoelectric detector;
the arrayed waveguide grating is used for demultiplexing the optical carrier containing the user data to obtain a first optical carrier containing first user data and a second optical carrier containing second user data;
one of the two sets of intensity modulators is configured to enable the first optical carrier to generate a frequency shift keying optical wave containing first user data under the control of a preset pseudorandom sequence, and the other of the two sets of intensity modulators is configured to enable the second optical carrier to generate a frequency shift keying optical wave containing second user data under the control of the preset pseudorandom sequence, wherein the frequency shift keying optical wave containing the first user data and the frequency shift keying optical wave containing the second user data are complementary in wavelength;
the first photodetector is used for converting the frequency shift keying light wave containing the first user data into a first electric signal containing the first user data;
the second photodetector is configured to convert the frequency shift keyed light wave containing the second user data into a second electrical signal containing the second user data.
Optionally, the output end of the arrayed waveguide grating is connected to the two sets of intensity modulators, and the two sets of intensity modulators are connected in parallel;
one of the two sets of intensity modulators comprises a seventh intensity modulator and an eighth intensity modulator, the other of the two sets of intensity modulators comprises a ninth intensity modulator and a tenth intensity modulator, the output end of the seventh intensity modulator is connected in parallel with the output end of the ninth intensity modulator, the output end of the tenth intensity modulator is connected in parallel with the output end of the eighth intensity modulator, the output end of the eighth intensity modulator is connected with the first photoelectric detector, and the output end of the ninth intensity modulator is connected with the second photoelectric detector.
Optionally, the system further comprises an optical fiber amplifier;
the optical fiber amplifier is connected with the signal generating device and the signal receiving device.
A third aspect of the embodiments of the present application provides a signal generating method, including:
generating an optical carrier of a single wavelength;
under the modulation of a fixed-frequency radio frequency signal, modulating the optical carrier to obtain modulation signals with different wavelengths, wherein the modulation signals comprise a first optical signal and a second optical signal;
filtering the modulation signal to obtain a first optical signal, and filtering the modulation signal to obtain a second optical signal;
generating frequency shift keying light waves with complementary wavelengths under the control of a preset pseudorandom sequence on the basis of the first optical signal and the second optical signal;
and modulating the user data to the frequency shift keying light wave with the complementary wavelength to obtain an optical carrier containing the user data.
A fourth aspect of the embodiments of the present application provides a communication method, including:
demultiplexing an optical carrier containing user data to obtain a first optical signal containing first user data and a second optical signal containing second user data;
causing the first optical signal to generate a frequency shift keying optical wave containing first user data under the control of a preset pseudorandom sequence, and causing the first optical signal to generate a frequency shift keying optical wave containing second user data under the control of the preset pseudorandom sequence, wherein the frequency shift keying optical wave containing the first user data and the frequency shift keying optical wave containing the second user data are complementary in wavelength;
converting the frequency-shift-keyed light wave containing the first user data to a first electrical signal containing the first user data, and converting the frequency-shift-keyed light wave containing the second user data to a second electrical signal containing the second user data.
As can be seen from the foregoing embodiments of the present application, the signal generating apparatus and method, and the communication apparatus and method provided by the present application generate frequency shift keying signals with complementary wavelengths on two branches by using multiple intensity modulators, where the distribution of the wavelengths of the signals between the two branches is controlled by a preset pseudorandom sequence, so as to implement random hopping of user data between channels corresponding to different wavelengths, and effectively prevent information leakage and illegal eavesdropping.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a signal generating device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a signal generating method according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a communication method according to an embodiment of the present application;
FIG. 5 is a diagram of complementary wavelength-shift-keyed optical waves generated under the control of a predetermined pseudo-random sequence according to an embodiment of the present application;
fig. 6 is a schematic diagram of random data hopping according to an embodiment of the present application.
Detailed Description
In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a signal generating device according to an embodiment of the present application, the device mainly includes:
the optical fiber Bragg grating light source comprises a laser, a Mach-Zehnder modulator, a first optical fiber Bragg grating, a second optical fiber Bragg grating and three groups of intensity modulators;
the laser is used for generating an optical carrier;
the Mach-Zehnder modulator is used for modulating the optical carrier under the modulation of a fixed frequency signal to obtain a modulation signal, and the modulation signal comprises a first optical signal and a second optical signal;
the first fiber Bragg grating is used for filtering the modulation signal to obtain a first optical signal;
the second fiber Bragg grating is used for filtering the modulation signal to obtain a second optical signal;
two groups of intensity modulators in the three groups of intensity modulators are respectively used for generating frequency shift keying light waves with complementary wavelengths under the control of a preset pseudorandom sequence based on the first optical signal and the second optical signal, and the other group of intensity modulators in the three groups of intensity modulators is used for modulating user data onto the frequency shift keying light waves with complementary wavelengths to obtain an optical carrier containing the user data.
In the present disclosure, the optical carrier generated by the laser may be a continuous optical carrier.
In the present disclosure, the fixed frequency signal may be a sine wave signal or a cosine wave signal.
In the disclosure, the first optical signal and the second optical signal have different wavelengths, and the wavelength of the optical carrier emitted by the laser is λ0At a fixed frequency f0Generates a first optical signal and a second optical signal under the modulation of the sine wave signal, wherein the wavelength lambda of the first optical signal1With the wavelength lambda of the second optical signal2In a difference that
In the present disclosure, the type of intensity modulator may be an electro-absorption modulator, an electro-optical phase modulator, or other types, which are not limited by the present disclosure.
In the present disclosure, the preset pseudo-random sequence may be a random sequence, generated by a pseudo-random sequence generator (PRBS), or may be set manually, which is not limited in the present disclosure.
According to the embodiment of the disclosure, a plurality of intensity modulators are utilized to generate frequency shift keying signals with complementary wavelengths on two branches, the distribution of the wavelengths of the signals between the two branches is controlled by a preset pseudorandom sequence, and by the scheme, the random hopping of user data among channels corresponding to different wavelengths is realized, and information leakage and illegal eavesdropping are effectively prevented.
In an embodiment of the present application, as shown in fig. 1, the input end of a first intensity modulator of the two sets of intensity modulators is connected to the output end of the first fiber bragg grating, and the input end of a second intensity modulator of the two sets of intensity modulators is connected to the output end of the second fiber bragg grating;
the first set of intensity modulators comprises a first intensity modulator and a second intensity modulator, the first intensity modulator and the second intensity modulator connected in parallel, the second set of intensity modulators comprises a third intensity modulator and a fourth intensity modulator, the third intensity modulator and the fourth intensity modulator connected in parallel;
the output end of the first intensity modulator is connected in parallel with the output end of the third intensity modulator, and the output end of the second intensity modulator is connected in parallel with the output end of the fourth intensity modulator.
In an embodiment of the present application, as shown in fig. 1, the output of the second intensity modulator is connected to the input of the fifth intensity modulator, and the output of the third intensity modulator is connected to the input of the sixth intensity modulator.
In one embodiment of the present application, as shown in fig. 1, the optical carrier includes a first optical carrier and a second optical carrier, and the other of the three sets of intensity modulators includes a fifth intensity modulator and a sixth intensity modulator;
the fifth intensity modulator is configured to modulate the first user data onto one of the frequency shift keying optical waves with complementary wavelengths, so as to obtain a first optical carrier containing the first user data;
and the sixth intensity modulator is configured to modulate the second user data onto another one of the frequency shift keying optical waves with complementary wavelengths, so as to obtain a second optical carrier containing the second user data.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the communication device mainly includes:
the signal generating device and the signal receiving device as described in figure 1;
the signal receiving device comprises an array waveguide grating, two groups of intensity modulators, a first photoelectric detector and a second photoelectric detector;
the arrayed waveguide grating is used for demultiplexing the optical carrier containing the user data to obtain a first optical carrier containing first user data and a second optical carrier containing second user data;
one of the two sets of intensity modulators is configured to enable the first optical carrier to generate a frequency shift keying optical wave containing first user data under the control of a preset pseudorandom sequence, and the other of the two sets of intensity modulators is configured to enable the second optical carrier to generate a frequency shift keying optical wave containing second user data under the control of the preset pseudorandom sequence, wherein the frequency shift keying optical wave containing the first user data and the frequency shift keying optical wave containing the second user data are complementary in wavelength;
the first photodetector is used for converting the frequency shift keying light wave containing the first user data into a first electric signal containing the first user data;
the second photodetector is configured to convert the frequency shift keyed light wave containing the second user data into a second electrical signal containing the second user data.
In an embodiment of the present application, as shown in fig. 2, the output end of the arrayed waveguide grating is connected to the two sets of intensity modulators, and the two sets of intensity modulators are connected in parallel;
one of the two sets of intensity modulators comprises a seventh intensity modulator and an eighth intensity modulator, the other of the two sets of intensity modulators comprises a ninth intensity modulator and a tenth intensity modulator, the output end of the seventh intensity modulator is connected in parallel with the output end of the ninth intensity modulator, the output end of the tenth intensity modulator is connected in parallel with the output end of the eighth intensity modulator, the output end of the eighth intensity modulator is connected with the first photoelectric detector, and the output end of the ninth intensity modulator is connected with the second photoelectric detector.
In an embodiment of the present application, as shown in fig. 2, a fiber amplifier is further included;
the optical fiber amplifier is connected with the signal generating device and the signal receiving device.
Referring to fig. 3, fig. 3 is a schematic flow chart of a signal generating method according to an embodiment of the present application, where the method is implemented by using the signal generating apparatus shown in fig. 1, and the method mainly includes:
s101, generating an optical carrier.
S102, under the modulation of the fixed frequency signal, modulating the optical carrier to obtain a modulation signal, wherein the modulation signal comprises a first optical signal and a second optical signal.
S103, filtering the modulation signal to obtain a first optical signal, and filtering the modulation signal to obtain a second optical signal.
And S104, generating frequency shift keying light waves with complementary wavelengths under the control of a preset pseudorandom sequence based on the first optical signal and the second optical signal.
And S105, modulating the user data to the frequency shift keying light wave with the complementary wavelength to obtain an optical carrier containing the user data.
Referring to fig. 4, fig. 4 is a schematic flowchart of a communication method according to an embodiment of the present application, where the method is implemented by using the communication device shown in fig. 2, and the method mainly includes:
s201, demultiplexing the optical carrier containing the user data to obtain a first optical carrier containing the first user data and a second optical carrier containing the second user data.
S202, enabling the first optical carrier to generate a frequency shift keying optical wave containing first user data under the control of a preset pseudorandom sequence, and enabling the first optical carrier to generate a frequency shift keying optical wave containing second user data under the control of the preset pseudorandom sequence, where the frequency shift keying optical wave containing the first user data and the frequency shift keying optical wave containing the second user data are complementary in wavelength.
S203, converting the frequency shift keyed optical wave containing the first user data into a first electrical signal containing the first user data, and converting the frequency shift keyed optical wave containing the second user data into a second electrical signal containing the second user data.
Referring to fig. 5, fig. 5 is a schematic diagram of frequency shift keying optical waves with complementary wavelengths generated under the control of a predetermined pseudo-random sequence according to an embodiment of the present application. The predetermined pseudo-random sequence is 01001011101001, for example.
Referring to fig. 6, fig. 6 is a schematic diagram of random data hopping according to an embodiment of the present application. The predetermined pseudo-random sequence is 01001011101001, for example.
It should be noted that each functional module in each embodiment of the present disclosure may be integrated into one processing module, or each module may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module 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 invention may be substantially or partially embodied in the form of a software product, or all or part of the technical solution that contributes to the prior art.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no acts or modules are necessarily required of the invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In view of the above description of the signal generating device and method, the communication device and method, and the application scope of the present invention, it will be apparent to those skilled in the art that the present invention is not limited to the signal generating device and method, and the embodiments and application scope of the present invention can be changed.