阅读说明：本技术 一种自适应分时传输双向对称光放大装置 (Self-adaptive time-sharing transmission bidirectional symmetrical light amplification device ) 是由 林平卫 宋振飞 于 2020-12-10 设计创作，主要内容包括：本发明提供了一种自适应分时传输双向对称光放大装置及其控制方法,该装置包括第一磁光开关(1)、第二磁光开关((2))、第一光放大器((3))、第二光放大器((4))和检测控制单元((6)),通过检测第一光放大器((3))、第二光放大器((4))输入端是否有光控制第一磁光开关((1))和第二磁光开关((2))的状态,实现根据光传输方向自适应选择单向光放大器的效果,解决了单光纤信号传递过程中背向散射光严重、多级光放大后信号不稳、噪声大的诸多问题。(The invention provides an adaptive time-sharing transmission bidirectional symmetrical light amplification device and a control method thereof, the device comprises a first magneto-optical switch (1), a second magneto-optical switch ((2)), a first optical amplifier ((3)), a second optical amplifier ((4)) and a detection control unit ((6)), and the effect of adaptively selecting a unidirectional optical amplifier according to the light transmission direction is realized by detecting whether the input ends of the first optical amplifier ((3)) and the second optical amplifier ((4)) optically control the states of the first magneto-optical switch ((1)) and the second magneto-optical switch ((2)), so that the problems of serious back scattering light, unstable signals after multi-stage light amplification and large noise in the single-optical-fiber signal transmission process are solved.)

1. A self-adaptive time-sharing transmission bidirectional symmetrical light amplification device is characterized by comprising a first magneto-optical switch (1), a second magneto-optical switch (2), a first optical amplifier (3), a second optical amplifier (4) and a detection control unit (6).

2. The adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 1,

the first magneto-optical switch (1) and the second magneto-optical switch (2) are two-way magneto-optical switches, the input end and the output end can be interchanged, and pins are arranged on the two-way magneto-optical switches to control the two-way magneto-optical switches to be in a forward input state or a reverse output state.

3. The adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 1,

the first optical amplifier (3) and the second optical amplifier (4) are unidirectional optical amplifiers,

4. the adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 1,

the optical transmission amplifying directions of the first optical amplifier (3) and the second optical amplifier (4) are opposite,

the input end of the first optical amplifier (3) is connected with one output end of the first magneto-optical switch (1), and the output end of the second optical amplifier (4) is connected with the other output end of the first magneto-optical switch (1); the output end of the first optical amplifier (3) is connected with one output end of the second magneto-optical switch (2); the input end of the second optical amplifier (4) is connected with the other output end of the second magneto-optical switch (2).

5. The adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 1,

the adaptive time-sharing transmission bidirectional symmetrical optical amplification device is provided with an optical fiber (5) with a replaceable length, and the optical fiber (5) with the replaceable length is connected with the first optical amplifier (3) or the second optical amplifier (4).

6. The adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 1,

the detection control unit (6) has a photoelectric sensor (61) and a control module (62),

the photoelectric sensors (61) are at least 2 and are positioned at the input ends of the first optical amplifier (3) and the second optical amplifier (4), and the photoelectric sensors (61) detect the optical power in the optical path and transmit the detection result to the control module (62);

the control module (62) is connected with pins of the first magneto-optical switch (1) and the second magneto-optical switch (2), and controls the on-off states of the first magneto-optical switch (1) and the second magneto-optical switch (2) according to the detection result of the photoelectric sensor (61).

7. The adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 6,

the amplification factor of the unidirectional optical amplifier is adjustable, and the output ends of the first optical amplifier (3) and the second optical amplifier (4) are respectively provided with a photoelectric sensor (61) for detecting the optical power amplified by the optical amplifiers.

8. A control method of a self-adaptive time-sharing transmission bidirectional symmetrical optical amplification device is characterized in that whether light exists at the input ends of a first optical amplifier (3) and a second optical amplifier (4) or not is detected to control the states of a first magneto-optical switch (1) and a second magneto-optical switch (2).

9. The method for controlling an adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 8,

in an initial state, the first magneto-optical switch (1) and the second magneto-optical switch (2) are switched to a forward input state;

when the input end of the first optical amplifier (3) detects light, the second magneto-optical switch (2) is switched to a reverse output state, and at the moment, the optical signal sequentially passes through the first magneto-optical switch (1), the first optical amplifier (3) and the second magneto-optical switch (2);

when the input end of the second optical amplifier (4) detects light, the first magneto-optical switch (1) is switched to a reverse output state, and at the moment, the optical signal sequentially passes through the second magneto-optical switch (2), the second optical amplifier (4) and the first magneto-optical switch (1);

when the input ends of the first optical amplifier (3) and the second optical amplifier (4) do not detect light, the first magneto-optical switch (1) and the second magneto-optical switch (2) are switched to a forward input state.

10. The method for controlling an adaptive time-sharing transmission bi-directional symmetric optical amplification apparatus according to claim 8,

the amplification factor of the optical amplifier is controlled so that the detected optical power of the output ends of the first optical amplifier (3) and the second optical amplifier (4) is consistent with a set target value_。

Technical Field

The invention relates to an optical amplification device, in particular to a self-adaptive time-sharing transmission bidirectional symmetrical optical amplification device, and belongs to the technical field of time frequency.

Background

In the optical fiber time frequency signal transmission, an optical amplifier is required to amplify an optical signal because the optical signal is seriously attenuated after being transmitted in the optical fiber for a certain distance.

When optical fiber frequency signals are transmitted, because bidirectional symmetry of time delay is not particularly considered, a signal transmission mode that one channel goes back to the other channel can be adopted, and two directional optical amplifiers separated according to wavelength are correspondingly adopted to amplify the signals. However, for time transfer synchronization, the two-way symmetry of signal transmission delay is very important, so that the optical signals are transferred in two directions by using the same wavelength light in a time-division manner, and the corresponding optical amplifier needs to perform optimal amplification on both-way optical signals.

Most of the prior art directly adopts a bidirectional optical amplifier which can amplify bidirectional light, and the prior art has the following serious defects: because the actual optical fiber has more joints, the back scattering light is serious, and the signal is unstable and has large noise after the multistage optical amplification. In addition, because the loss of each section of optical fiber is different, the optical amplification factors required by forward light and backward light are different, and the traditional optical amplifier is difficult to adjust, so that the stability and symmetry of optical fiber signals are reduced, and the precision of time transmission is influenced.

Therefore, there is a need to develop an optical amplifier device that is stable in signal, has low noise, and can cope with optical fibers of different lengths.

Disclosure of Invention

In order to solve the above problems, the present inventors have conducted intensive studies, and in one aspect, provide an adaptive time-division transmission bidirectional symmetric optical amplification apparatus including a first magneto-optical switch 1, a second magneto-optical switch 2, a first optical amplifier 3, a second optical amplifier 4, and a detection control unit 6.

The first magneto-optical switch 1 and the second magneto-optical switch 2 are two-way magneto-optical switches, input and output ends can be interchanged, and pins are arranged on the two-way magneto-optical switches to control the two-way magneto-optical switches to be in a forward input state or a reverse output state.

The first optical amplifier 3 and the second optical amplifier 4 are unidirectional optical amplifiers,

the optical transmission amplification directions of the first optical amplifier 3 and the second optical amplifier 4 are opposite,

the input end of the first optical amplifier 3 is connected with one output end of the first magneto-optical switch 1, and the output end of the second optical amplifier 4 is connected with the other output end (used as optical signal input) of the first magneto-optical switch 1; the output of the first optical amplifier 3 is connected to an output (for optical signal input) of the second magneto-optical switch 2; an input of the second optical amplifier 4 is connected to the other output of the second magneto-optical switch 2.

The adaptive time-sharing transmission bidirectional symmetrical optical amplification device is provided with an optical fiber 5 with a replaceable length, and the optical fiber 5 with the replaceable length is connected with the first optical amplifier 3 or the second optical amplifier 4.

The detection control unit 6 has a photosensor 61 and a control module 62,

the photoelectric sensor 61 is at least 2 and is positioned at the input ends of the first optical amplifier 3 and the second optical amplifier 4, and the photoelectric sensor 61 detects the optical power in the optical path and transmits the detection result to the control module 62;

the control module 62 is connected to pins of the first magneto-optical switch 1 and the second magneto-optical switch 2, and controls the switching states of the first magneto-optical switch 1 and the second magneto-optical switch 2 according to the detection result of the photoelectric sensor 61.

The amplification factor of the unidirectional optical amplifier is adjustable, and the output ends of the first optical amplifier 3 and the second optical amplifier 4 are respectively provided with a photoelectric sensor 61 for detecting the optical power amplified by the optical amplifiers.

On the other hand, the invention also provides a control method of the adaptive time-sharing transmission bidirectional symmetrical optical amplification device, which controls the states of the first magneto-optical switch 1 and the second magneto-optical switch 2 by detecting whether light exists at the input ends of the first optical amplifier 3 and the second optical amplifier 4.

In an initial state, the first magneto-optical switch 1 and the second magneto-optical switch 2 are switched to a forward input state;

when the input end of the first optical amplifier 3 detects light, the second magneto-optical switch 2 is switched to a reverse output state, and at the moment, an optical signal sequentially passes through the first magneto-optical switch 1, the first optical amplifier 3 and the second magneto-optical switch 2;

when the input end of the second optical amplifier 4 detects light, the first magneto-optical switch 1 is switched to a reverse output state, and at the moment, an optical signal sequentially passes through the second magneto-optical switch 2, the second optical amplifier 4 and the first magneto-optical switch 1;

when the input ends of the first optical amplifier 3 and the second optical amplifier 4 do not detect light, the first magneto-optical switch 1 and the second magneto-optical switch 2 are switched to a forward input state.

The detected optical power at the output ends of the first optical amplifier 3 and the second optical amplifier 4 is made to coincide with a set target value by controlling the amplification factor of the optical amplifiers.

Through testing and adjustment of the optical fiber with the replaceable length, the bidirectional symmetry of the optical path is ensured.

The self-adaptive time-sharing transmission bidirectional symmetrical light amplification device provided by the invention has the following beneficial effects:

(1) the effect of the unidirectional optical amplifier is selected in a self-adaptive manner according to the optical transmission direction;

(2) the optical power amplification self-adaption is realized;

(3) and the unidirectional amplifier is adopted for amplification, so that the amplified optical signal has low noise.

(4) The problems of serious backscattering and unstable signals after multi-stage light amplification are solved.

(5) The bidirectional symmetry of the optical path is solved.

Drawings

Fig. 1 shows a schematic structural diagram of an adaptive time-sharing transmission bidirectional symmetric optical amplification device according to a preferred embodiment.

The reference numbers illustrate:

1-a first magneto-optical switch;

2-a second magneto-optical switch;

3-a first optical amplifier;

4-a second optical amplifier;

5-a replaceable length of optical fiber;

6-a detection control unit;

61-a photosensor;

62-control module.

Detailed Description

The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention, as illustrated in the accompanying drawings.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The invention provides a self-adaptive time-sharing transmission bidirectional symmetrical optical amplification device, which comprises a first magneto-optical switch 1, a second magneto-optical switch 2, a first optical amplifier 3, a second optical amplifier 4 and a detection control unit 6, as shown in figure 1.

The first magneto-optical switch 1 and the second magneto-optical switch 2 are two-way magneto-optical switches, and the two-way magneto-optical switch is an all-solid-state switch and is provided with one path of optical fiber input end and two paths of optical fiber output ends, and the optical signals are switched by utilizing a Faraday optical rotation effect. The interior of the linear polarization light source is provided with a changeable magnetic field, and the linear polarization light is enabled to rotate by changing the magnetic field acting on the linear polarization light, so that the controllable selection of the polarized light outlet is realized. The two-way magneto-optical switch has a pin, and the input and output of the two-way magneto-optical switch can be controlled by changing an electric control signal applied to the pin, wherein the control includes controlling the two-way magneto-optical switch to be in a forward input state or a reverse output state. Furthermore, the optical path of the bidirectional magneto-optical switch is bidirectional light which can be input from the input end of the alternative magneto-optical switch and output from one output end; light may also be input from one output and output from the input.

The optical fiber input ends of the first magneto-optical switch 1 and the second magneto-optical switch 2 are connected with optical fibers.

The first optical amplifier 3 and the second optical amplifier 4 are unidirectional optical amplifiers, and optical signals to be amplified are input from the input end of the unidirectional optical amplifier, amplified by the optical amplifier and output from the output end of the unidirectional optical amplifier.

In the invention, two unidirectional optical amplifiers are adopted, and the problem of back scattering in a single optical fiber is solved through the unidirectional amplification effect, so that the multistage optical amplification is realized, and the optical signals can still keep the characteristics of stable signals and low noise after the multistage optical amplification.

Preferably, the amplification factor of the unidirectional optical amplifier is adjustable, an adjusting pin is arranged on the unidirectional optical amplifier, and the amplification factor of the unidirectional optical amplifier is changed by changing the current connected with the adjusting pin.

In the invention, the optical transmission amplification directions of the first optical amplifier 3 and the second optical amplifier 4 are opposite, specifically, the input end of the first optical amplifier 3 is connected with one output end of the first magneto-optical switch 1, and the output end of the second optical amplifier 4 is connected with the other output end of the first magneto-optical switch 1; the output end of the first optical amplifier 3 is connected with one output end of the second magneto-optical switch 2; the input end of the second optical amplifier 4 is connected with the other output end of the second magneto-optical switch 2;

further, the other output terminal of the first magneto-optical switch 1 connected to the output terminal of the second optical amplifier 4 and the output terminal of the first optical amplifier 3 connected to the output terminal of the first optical amplifier 3 are used for inputting optical signals to determine the propagation direction of the optical path.

In a preferred embodiment, the adaptive time-sharing transmission bidirectional symmetrical optical amplification device further comprises a replaceable length optical fiber 5, and the replaceable length optical fiber 5 is connected with the first optical amplifier 3 or the second optical amplifier 4.

The inventor finds that the two-way symmetry is reduced when the optical signal is transmitted in two ways due to slight difference of the time when the optical signal passes through the first optical amplifier 3 and the second optical amplifier 4, and the two-way symmetry requirement is achieved by adjusting the transmission time of the optical signal after passing through the first optical amplifier 3 or the second optical amplifier 4 by adding the optical fiber 5 with changeable length.

Preferably, said replaceable length of optical fibre 5 is obtained by cutting the optical fibre.

Further, the optical fiber 5 of replaceable length may be arranged between the first optical amplifier 3 and the first magneto-optical switch 1; or between the first optical amplifier 3 and the second magneto-optical switch 2; or between the second optical amplifier 4 and the first magneto-optical switch 1; or between the second optical amplifier 4 and the second magneto-optical switch 2.

The detection control unit 6 has a photosensor 61 and a control module 62.

The photo sensors 61 have 2, respectively located at the input of the first optical amplifier 3 and the second optical amplifier 4, and are capable of detecting the optical power in the optical path and transmitting the detection result to the control module 62.

The control module 62 is connected to pins of the first magneto-optical switch 1 and the second magneto-optical switch 2, and can control the on-off states of the first magneto-optical switch 1 and the second magneto-optical switch 2 according to the detection result of the photoelectric sensor 61.

Further, the control module 62 switches the first magneto-optical switch 1 and the second magneto-optical switch 2 to a forward input state, at this time, the photosensor 61 at the input end of the first optical amplifier 3 and the second optical amplifier 4 starts to detect whether light is present in the optical path, and when the photosensor 61 at the input end of the first optical amplifier 3 detects that light is present in the optical path, the second magneto-optical switch 2 is switched to a reverse output state, so that the optical signal can sequentially pass through the first magneto-optical switch 1, the first optical amplifier 3 and the second magneto-optical switch 2; when the photoelectric sensor 61 at the input end of the second optical amplifier 4 detects that light exists in the light path, the first magneto-optical switch 1 is switched to a reverse output state, so that an optical signal can sequentially pass through the second magneto-optical switch 2, the second optical amplifier 4 and the first magneto-optical switch 1; when the photosensors 61 at the input ends of the first optical amplifier 3 and the second optical amplifier 4 do not detect light in the optical path, the first magneto-optical switch 1 and the second magneto-optical switch 2 are switched to the forward input state. The above process is repeated, so that the device realizes the effect of self-adaptively selecting the unidirectional optical amplifier according to the optical transmission direction.

According to the present invention, the presence of light in the optical path means that the optical power detected by the photosensor 61 is greater than-35 dBm.

Through the switching of the first magneto-optical switch 1 and the second magneto-optical switch 2, the effect that optical signals do not interfere with each other in two directions during amplification under a single optical fiber is achieved, so that the optical signals with the same wavelength can only be transmitted in the optical fiber in a single direction at a certain moment, back scattering light brought by an optical fiber port is effectively eliminated, noise after optical amplification is low, and meanwhile, due to the effective reduction of the back scattering light, the possibility that multi-stage amplification obtains stable signals is achieved.

In a preferred embodiment, a photosensor 61 is further disposed at the output end of each of the first optical amplifier 3 and the second optical amplifier 4, and is used for detecting the optical power amplified by the optical amplifiers.

Further, the control module 62 is further connected to the first optical amplifier 3 and the second optical amplifier 4 to adjust the optical amplification factor, an optical power target value is set in the control module 62, and the control module 62 achieves an optical power amplification self-adapting effect by comparing the difference between the output power of the optical amplifier and the target value and by adjusting the optical amplification factor of the first optical amplifier 3 and the second optical amplifier 4.

According to a preferred embodiment of the present invention, the optical amplification of the first optical amplifier 3 and the second optical amplifier 4 is adjusted once every certain period of time, preferably every 10s to 1h according to actual needs.

On the other hand, the invention also provides a control method of the adaptive time-sharing transmission bidirectional symmetrical optical amplification device, which realizes the effect of adaptively selecting the unidirectional optical amplifier according to the optical transmission direction by detecting whether the input ends of the first optical amplifier 3 and the second optical amplifier 4 have the state of the optical control first magneto-optical switch 1 and the second magneto-optical switch 2.

In an initial state, the first magneto-optical switch 1 and the second magneto-optical switch 2 are switched to a forward input state;

when the input end of the first optical amplifier 3 detects light, the second magneto-optical switch 2 is switched to a reverse output state, and at the moment, an optical signal sequentially passes through the first magneto-optical switch 1, the first optical amplifier 3 and the second magneto-optical switch 2;

when the input end of the second optical amplifier 4 detects light, the first magneto-optical switch 1 is switched to a reverse output state, and at the moment, an optical signal sequentially passes through the second magneto-optical switch 2, the second optical amplifier 4 and the first magneto-optical switch 1;

when the input ends of the first optical amplifier 3 and the second optical amplifier 4 do not detect light, the first magneto-optical switch 1 and the second magneto-optical switch 2 are switched to a forward input state.

In a preferred embodiment, the detected optical powers at the output ends of the first optical amplifier 3 and the second optical amplifier 4 are made to coincide with the set target values by controlling the amplification of the optical amplifiers.

Specifically, when the detected optical power at the output end of the first optical amplifier 3 or the second optical amplifier 4 is smaller than the set target value, the first optical amplifier 3 or the second optical amplifier 4 is controlled to increase the amplification factor; when the detected optical power of the output end of the first optical amplifier 3 or the second optical amplifier 4 is larger than the set target value, the first optical amplifier 3 or the second optical amplifier 4 is controlled to reduce the amplification factor, and the effect of optical power amplification self-adaption is achieved.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on operational states of the present invention, and are only used for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.