Transmit receive isolation system and wavelength division multiplexed laser communication system

Abstract

The application discloses a kind of transceiving isolation systems, it is related to laser communication technical field, wherein, the circulator of transceiving isolation system includes first port, second port and third port, first port is equipped with transceiving antenna, first port to the one-way conduction of optical path of second port, the one-way conduction of optical path of third port to first port;Transceiving antenna is located at first port;Signal processing module includes receiving end and transmitting end;First isolator is located between second port and receiving end, and respectively with second port and receiving end optical fiber connection, and first isolator is used for one-way transmission remote optical signal;Second isolator is located between third port and transmitting end, and respectively with third port and transmitting end optical fiber connection, and second isolator is used for one-way transmission local optical signal;The technical scheme of the application provides a kind of transceiving isolation system not limited by space light optical path arrangement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser communication technology, in particular to a transceiver isolation system and a wavelength division multiplexing laser communication system. BACKGROUND

[0002] In the field of laser communication, the traditional transceiver isolation system mainly relies on a large number of spatial light lenses to realize the isolation and splitting of the received optical signal and the transmitted optical signal. Limited by the spatial light path arrangement, the traditional transceiver isolation system needs to be designed with complex spatial light paths, which also leads to problems such as large volume, high weight, poor reliability, and difficulty in effectively integrating the system. SUMMARY

[0003] The main purpose of the present application is to provide a transceiver isolation system and a wavelength division multiplexing laser communication system, which is not limited by the spatial light path arrangement.

[0004] To achieve the above purpose, the transceiver isolation system provided by the present application comprises:

[0005] A circulator, the circulator comprises a first port, a second port and a third port, the optical path from the first port to the second port is unidirectional, and the optical path from the third port to the first port is unidirectional;

[0006] A transceiver antenna, the transceiver antenna is arranged at the first port and is used for receiving a remote optical signal and transmitting a local optical signal;

[0007] A signal processing module, the signal processing module comprises a receiving end and a transmitting end;

[0008] A first isolator, the first isolator is arranged between the second port and the receiving end and is connected with the second port and the receiving end by optical fibers respectively, the first isolator is used for unidirectional transmission of the remote optical signal, so that the optical path from the second port to the receiving end is unidirectional; and

[0009] A second isolator, the second isolator is arranged between the third port and the transmitting end and is connected with the third port and the transmitting end by optical fibers respectively, the second isolator is used for unidirectional transmission of the local optical signal, so that the optical path from the transmitting end to the third port is unidirectional.

[0010] In an embodiment, the signal processing module comprises:

[0011] A general control processing unit;

[0012] a receiving unit, one end of the receiving unit being electrically connected with the general control processing unit, and the other end being formed with the receiving end, the receiving unit being configured to receive the remote optical signal through the receiving end, and convert the remote optical signal into a first electrical signal, so as to output the first electrical signal to the general control processing unit; and

[0013] a transmitting unit, one end of the transmitting unit being electrically connected with the general control processing unit, and the other end being formed with the transmitting end, the transmitting unit being configured to receive the second electrical signal output by the general control processing unit, and convert the second electrical signal into the local optical signal, so as to output the local optical signal to the third port.

[0014] In an embodiment, the receiving unit comprises:

[0015] a wavelength division demultiplexer, one end of the wavelength division demultiplexer being formed with the receiving end, and the other end comprising at least two first output ports, the wavelength division demultiplexer being configured to receive the remote optical signal through the receiving end, and demultiplex the remote optical signal into at least two first optical beams of different wavelengths, so as to be output through the at least two first output ports respectively; and

[0016] a communication receiver, one end of the communication receiver being electrically connected with the general control processing unit, and the other end comprising at least two first input ports, each of the first input ports being optically connected with a first output port, and being configured to input at least two first optical beams of different wavelengths respectively, so as to be converted into at least two first electrical signals of different frequencies.

[0017] In an embodiment, the receiving unit further comprises at least two filters, each of the filters being connected between an input port and an output port.

[0018] In an embodiment, the filter wavelength range of the filters is adjustable.

[0019] In an embodiment, the filters comprise:

[0020] a micrometer; and

[0021] a driving mechanism, the driving mechanism being drivingly connected with the micrometer, and being configured to drive the micrometer to rotate, so as to change the filter wavelength range of the filters.

[0022] In an embodiment, the driving mechanism is electrically connected with the general control processing unit, and is configured to drive the micrometer to rotate under the control of the general control processing unit.

[0023] In an embodiment, the transmitting unit comprises:

[0024] a communication transmitter, one end of the communication transmitter being electrically connected with the general control processing unit, and the other end including at least two second output ports, the communication transmitter being used for receiving the at least two second electrical signals of different frequencies output by the general control processing unit, and converting to obtain at least two second light beams of different wavelengths, and outputting through the at least two second output ports respectively; and

[0025] a wavelength division multiplexer, one end of the wavelength division multiplexer forming the transmitting end, and the other end including at least two second input ports, each of the second input ports being optically connected with a second output port, and being used for receiving the at least two second light beams of different wavelengths respectively, and coupling the at least two second light beams of different wavelengths as the local light signal.

[0026] In an embodiment, the first isolator and / or the second isolator is configured as a polarization-dependent magneto-optical isolator, which is used for unidirectional transmission of the optical signal, and rotates the polarization direction of the unidirectional transmission optical signal by 45°.

[0027] The application further provides a wavelength division multiplexing laser communication system, including the transceiving isolation system according to any one of the preceding embodiments, and the transceiving isolation system includes:

[0028] a circulator, the circulator including a first port, a second port and a third port, the first port being provided with the transceiving antenna, the optical path from the first port to the second port being unidirectional, and the optical path from the third port to the first port being unidirectional;

[0029] a transceiving antenna, the transceiving antenna being arranged at the first port, and being used for receiving the remote light signal and transmitting the local light signal;

[0030] a signal processing module, the signal processing module including a receiving end and a transmitting end;

[0031] a first isolator, the first isolator being arranged between the second port and the receiving end, and being optically connected with the second port and the receiving end respectively, the first isolator being used for unidirectional transmission of the remote light signal, so that the optical path from the second port to the receiving end is unidirectional; and

[0032] a second isolator, the second isolator being arranged between the third port and the transmitting end, and being optically connected with the third port and the transmitting end respectively, the second isolator being used for unidirectional transmission of the local light signal, so that the optical path from the transmitting end to the third port is unidirectional.

[0033] The transceiving isolation system of the technical scheme of the present application comprises a circulator, a transceiving antenna, a signal processing module, a first isolator and a second isolator, wherein the circulator comprises a first port, a second port and a third port, the first isolator is arranged between the second port and the receiving end of the signal processing module, and the second isolator is arranged between the second port and the transmitting end of the signal processing module. When the transceiving isolation system receives remote light, the remote light in space can be coupled into the remote light signal in the optical fiber through the transceiving antenna, the remote light signal can be unidirectionally transmitted in the circulator from the first port to the second port, and the remote light signal is unidirectionally transmitted from the second port to the receiving end of the signal processing module through the first isolator. Similarly, when the transceiving isolation system transmits remote light, the transmitting end of the signal processing module can output local light signal, and the local light signal is unidirectionally transmitted from the transmitting end of the signal processing module to the third port through the second isolator, and is unidirectionally transmitted from the third port to the first port through the circulator, so as to be coupled out from the local light signal in the optical fiber into the local light in space through the transceiving antenna. In this way, the transmitting light path of the local light signal and the receiving light path of the remote light signal can be constructed to realize the directional transmission of the local light signal and the remote light signal of the optical signal respectively. Since the transmitting light path and the receiving light path are both constructed by optical fiber devices, and do not need to use spatial light lenses, the structure of the transceiving isolation system can be more compact, and the volume of the transceiving isolation system can be reduced and the weight can be lighter. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, 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 labor on the basis of the drawings shown.

[0035] Figure 1 The structure schematic diagram of an embodiment of the transceiving isolation system provided by the present application;

[0036] Figure 2 For Figure 1 The local enlarged view of the transceiving isolation system in the embodiment;

[0037] Figure 3 For Figure 1 The structure schematic diagram of the circulator in the embodiment;

[0038] Figure 4 For Figure 1 The structure schematic diagram of the first isolator in the embodiment.

[0039] Explanation of reference numerals:

[0040] 100, transceiver isolation system; 10, circulator; 11, first port; 12, second port; 13, third port; 20, transceiver antenna; 30, signal processing module; 31, general control processing unit; 32, receiving unit; 321, wavelength division demultiplexer; 321a, receiving end; 321b, first output port; 322, communication receiver; 322a, first input port; 323, filter; 33, transmitting unit; 331, communication transmitter; 331a, second output port; 332, wavelength division multiplexer; 332a, transmitting end; 332b, second input port; 40, first isolator; 50, second isolator.

[0041] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0043] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0044] In addition, if the embodiments of the present application involve the description of “first”, “second” and the like, the description of “first”, “second” and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0045] In the field of laser communication, the traditional transceiver isolation system mainly relies on a large number of spatial optical lenses to realize the isolation and splitting of the received optical signal and the transmitted optical signal. Limited by the spatial optical path arrangement, the traditional transceiver isolation system needs to be designed with complex spatial optical paths, which also leads to problems such as large size, high weight, poor reliability, and difficulty in effectively integrating the system.

[0046] The present application provides a transceiver isolation system 100.

[0047] Please refer to Figure 1 and Figure 2 In an embodiment of the present application, the transceiver isolation system 100 comprises:

[0048] The circulator 10 comprises a first port 11, a second port 12 and a third port 13, the optical path from the first port 11 to the second port 12 is unidirectional, and the optical path from the third port 13 to the first port 11 is unidirectional.

[0049] The transceiver antenna 20 is arranged at the first port 11 and is used for receiving a remote optical signal and transmitting a local optical signal.

[0050] The signal processing module 30 comprises a receiving end 321a and a transmitting end 332a.

[0051] The first isolator 40 is arranged between the second port 12 and the receiving end 321a and is optically connected with the second port 12 and the receiving end 321a respectively, the first isolator 40 is used for unidirectional transmission of the remote optical signal, so that the optical path from the second port 12 to the receiving end 321a is unidirectional; and

[0052] The second isolator 50 is arranged between the third port 13 and the transmitting end 332a and is optically connected with the third port 13 and the transmitting end 332a respectively, the second isolator 50 is used for unidirectional transmission of the local optical signal, so that the optical path from the transmitting end 332a to the third port 13 is unidirectional.

[0053] The transceiver isolation system 100 of the technical scheme of the present application comprises a circulator 10, a transceiver antenna 20, a signal processing module 30, a first isolator 40 and a second isolator 50, wherein the circulator 10 comprises a first port 11, a second port 12 and a third port 13, the first isolator 40 is arranged between the second port 12 and the receiving end 321a of the signal processing module 30, and the second isolator 50 is arranged between the second port 12 and the transmitting end 332a of the signal processing module 30.

[0054] When the transceiving isolation system 100 receives the remote light, the remote light in the space can be coupled into the remote light signal in the optical fiber through the transceiving antenna 20, the remote light signal can be transmitted unidirectionally from the first port 11 to the second port 12 in the circulator 10, and the remote light signal is received unidirectionally from the second port 12 to the receiving end 321a of the signal processing module 30 through the first isolator 40.

[0055] Similarly, when the transceiving isolation system 100 transmits the remote light, the transmitting end 332a of the signal processing module 30 can output the local light signal, and the local light signal is transmitted unidirectionally from the transmitting end 332a of the signal processing module 30 to the third port 13 through the second isolator 50, and the local light signal is transmitted unidirectionally from the third port 13 to the first port 11 through the circulator 10, so as to be coupled out from the local light signal in the optical fiber to the local light in the space through the transceiving antenna 20.

[0056] In this way, the transmitting light path of the local light signal and the receiving light path of the remote light signal can be constructed to be isolated from each other, so as to realize the directional transmission of the local light signal and the remote light signal of the optical signal respectively, effectively suppress the reverse light interference, and realize the first-level isolation of the transceiving light beam.

[0057] It can be understood that, since the transmitting light path and the receiving light path are both constructed by the optical fiber device, and do not need to use the spatial light lens, the structure of the transceiving isolation system 100 can be more compact, which is beneficial to reduce the volume and weight of the transceiving isolation system 100.

[0058] Please refer to Figure 1 and Figure 2 In the embodiment of the present application, the signal processing module 30 comprises:

[0059] a general control processing unit 31;

[0060] a receiving unit 32, one end of the receiving unit 32 is electrically connected with the general control processing unit 31, and the other end of the receiving unit 32 is formed with the receiving end 321a, the receiving unit 32 is used for receiving the remote light signal through the receiving end 321a, converting the remote light signal into a first electric signal, and outputting the first electric signal to the general control processing unit 31; and

[0061] a transmitting unit 33, one end of the transmitting unit 33 is electrically connected with the general control processing unit 31, and the other end of the transmitting unit 33 is formed with the transmitting end 332a, the transmitting unit 33 is used for receiving a second electric signal output by the general control processing unit 31, converting the second electric signal into the local light signal, and outputting the local light signal to the third port 13.

[0062] Thus, after the transceiving antenna 20 couples the remote light in space into the remote light signal in the optical fiber, the photoelectric conversion of the remote light signal can be realized by the receiving unit 32, so that the first electric signal converted from the remote light signal can be obtained, so as to facilitate the collection and control processing of the first electric signal by the general control processing unit 31.

[0063] The general control processing unit 31 can also be used to output the second electric signal, and the electro-optical conversion of the second electric signal can be realized by the transmitting unit 33, so that the local light signal converted from the second electric signal can be obtained, and then the local light signal can be coupled out into the local light in space by the transceiving antenna 20, so as to realize the laser communication by the long-distance high-speed transmission of the space light.

[0064] Further, in addition to the first-order isolation of the transceiving isolation system 100 realized by the circulator 10, the first isolator 40 and the second isolator 50 in the foregoing embodiment, the characteristics of the wavelength division demultiplexer 321 and / or the wavelength division multiplexer 332 in the subsequent embodiment can also be used to enable the transceiving isolation system 100 to realize the separate transmission of specific wavelength beams, so as to effectively improve the isolation degree of the transceiving isolation system 100.

[0065] Specifically, please refer to Figure 2 In the embodiment of the present application, the receiving unit 32 comprises:

[0066] a wavelength division demultiplexer 321, one end of the wavelength division demultiplexer 321 forms the receiving end 321a, and the other end comprises at least two first output ports 321b, the wavelength division demultiplexer 321 is used to receive the remote light signal through the receiving end 321a, and decompose the remote light signal into at least two first light beams of different wavelengths, and output through at least two first output ports 321b respectively; and

[0067] a communication receiver 322, one end of the communication receiver 322 is electrically connected with the general control processing unit 31, and the other end comprises at least two first input ports 322a, each first input port 322a is optically connected with a first output port 321b by a fiber, and is used to input at least two first light beams of different wavelengths respectively, so as to convert at least two first electric signals of different frequencies.

[0068] Among them, the receiving end 321a of the wavelength division demultiplexer 321 can be connected to the first isolator 40 through a coupling optical fiber, and each first output port 321b and the first input port 322a of the communication receiver 322 can also be connected through a coupling optical fiber.

[0069] In some embodiments, the wavelength division demultiplexer 321 comprises N first output ports 321b, and can demultiplex the remote optical signal into a plurality of wavelength first optical beams, R1, R2, R3, R4, …, Rn, and make the plurality of wavelength first optical beams enter the N first input ports 322a of the communication receiver 322, respectively, and then convert the plurality of wavelength first optical beams into a plurality of frequency first electrical signals through the communication receiver 322.

[0070] Referring to Figure 2 In embodiments of the present application, the receiving unit 32 further comprises at least two filters 323, each of which is connected between an input port and an output port.

[0071] In this way, the receiving unit 32 can comprise a filter 323 group composed of at least two filters 323, so as to facilitate filtering of the first optical beams of specific wavelengths by different filters 323 in the filter 323 group.

[0072] In embodiments of the present application, the filter 323 can be adjusted in terms of filtering wavelength range.

[0073] In this way, the filter 323 can be configured as an adjustable filter 323, which can filter the optical beams of specific wavelengths and isolate the optical beams of other wavelengths.

[0074] Specifically, after the wavelength division demultiplexer 321 demultiplexes the remote optical signal into first optical beams of different wavelengths, each first optical beam can correspond to an adjustable filter 323, thereby achieving effective isolation between the first optical beams of different wavelengths.

[0075] In embodiments of the present application, the filter 323 comprises:

[0076] a micrometer; and

[0077] a driving mechanism, which is drivingly connected with the micrometer and used to drive the micrometer to rotate to change the filtering wavelength range of the filter 323.

[0078] The driving mechanism can drive the micrometer of the filter 323 to rotate by a specific angle to filter specific wavelengths and isolate optical beams of other wavelengths. Since the number of adjustable filters 323 in the filter 323 group is adjusted according to the number of first optical beams demultiplexed by the wavelength division demultiplexer 321, and the filtering wavelength range of each adjustable filter 323 can be adjusted individually, the receiving unit 32 can be reconfigured and is easy to reconfigure.

[0079] Referring to Figure 2In the embodiment of the present application, the driving mechanism and the general control processing unit 31 are electrically connected, for driving the micrometer rotary motion under the control of the general control processing unit 31.

[0080] In this way, the wavelength range of each filter 323 in the filter 323 group can be independently adjusted by the general control processing unit 31 in an electrically controlled manner, so as to realize the secondary isolation of the transceiving light beams, and thus the secondary isolation of the transceiving light beams can be realized by the electrically controlled adjustable filter 323 group.

[0081] Please refer to Figure 2 In the embodiment of the present application, the transmitting unit 33 comprises:

[0082] The communication transmitter 331 has one end electrically connected to the general control processing unit 31 and the other end comprising at least two second output ports 331a, and is configured to receive the second electrical signals of at least two different frequencies output by the general control processing unit 31 and convert the second electrical signals into at least two second light beams of different wavelengths for output through the at least two second output ports 331a respectively.

[0083] The wavelength division multiplexer 332 has one end forming the transmitting end 332a and the other end comprising at least two second input ports 332b, each of which is optically connected to a second output port 331a and configured to receive the at least two second light beams of different wavelengths respectively, so as to couple the at least two second light beams of different wavelengths into the local light signal.

[0084] In the embodiment of the present application, the transmitting end 332a of the wavelength division multiplexer 332 can be connected to the second isolator 50 through a coupling optical fiber, and each second output port 331a of the communication receiver 322 and each second input port 332b of the wavelength division multiplexer 332 can also be connected through a coupling optical fiber.

[0085] In some embodiments, the communication transmitter 331 comprises N second output ports 331a, which are configured to convert the second electrical signals of multiple frequencies output by the general control processing unit 31 into second light beams of multiple wavelengths, i.e. R1, R2, R3, R4, …, Rn respectively, and make the second light beams of multiple wavelengths enter the N second input ports 332b of the wavelength division multiplexer 332 respectively, so as to couple the second light beams of multiple wavelengths into the local light signal through the wavelength division multiplexer 332.

[0086] Please refer to Figure 4In the embodiments of the present application, the first isolator 40 and / or the second isolator 50 are configured as polarization-dependent magneto-optical isolators for unidirectional transmission of optical signals, and the polarization direction of the unidirectional transmission of the optical signals is rotated by 45°.

[0087] In some embodiments, the basic structure of the polarization-dependent magneto-optical isolator includes a polarizer, an analyzer, and a ring-shaped permanent magnet and magneto-optical material along the axial direction. Among them, the magneto-optical material is usually fixed at the center of the ring-shaped magnet, and the two together constitute a 45° Faraday rotator (FR), and the included angle between the light transmission directions of the polarizer and the analyzer is 45°.

[0088] Specifically, when the optical signal is incident along the magnetic field direction, the linearly polarized light emitted from the polarizer passes through the 45° Faraday rotator, and the polarization direction is rotated by 45°. The optical signal after the polarization direction is rotated can normally pass through the analyzer.

[0089] Further, due to the non-reciprocity of the magneto-optic effect, when the optical signal is incident in the opposite direction along the magnetic field direction, the linearly polarized light emitted from the analyzer continues to rotate by 45° in the same rotation direction as before after passing through the 45° Faraday rotator. At this time, the polarization direction forms an angle of 90° with the polarizer, so that the optical signal incident in the opposite direction cannot pass through the polarization-dependent magneto-optical isolator. In this way, the polarization-dependent magneto-optical isolator can realize the effect of passing the optical signal incident in the positive direction along the magnetic field direction in the positive direction, and the optical signal incident in the opposite direction along the magnetic field direction in the opposite direction.

[0090] Of course, the technical solutions of the present application are not limited to this. In some embodiments, the first isolator 40 and / or the second isolator 50 can also be configured as a polarization-independent magneto-optical isolator, which is not limited here.

[0091] It can be understood that by setting the circulator 10 and the magneto-optical isolator, the polarization state of the signal light in the transceiver isolation system 100 can be effectively adjusted, thereby facilitating efficient and bidirectional transmission isolation of the optical signal.

[0092] The present application also proposes a wavelength division multiplexing laser communication system, which comprises a transceiver isolation system 100, and the specific structure of the transceiver isolation system 100 is referred to the above-mentioned embodiments. Since the wavelength division multiplexing laser communication system adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0093] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, within the technical concept of the present application, and based on the content of the present application and the accompanying drawings, are included in the patent protection scope of the present application.

Claims

1. A transceiver isolation system, characterized in that, include: A circulator, comprising a first port, a second port, and a third port, wherein the optical path from the first port to the second port is unidirectional, and the optical path from the third port to the first port is unidirectional. A transceiver antenna is provided at the first port for receiving remote optical signals and transmitting local optical signals; The signal processing module includes a receiver and a transmitter. A first isolator is disposed between the second port and the receiving end, and is optically connected to the second port and the receiving end respectively. The first isolator is used to transmit remote optical signals in one direction so that the optical path from the second port to the receiving end is unidirectionally open. as well as The second isolator is disposed between the third port and the transmitter, and is optically connected to the third port and the transmitter respectively. The second isolator is used to transmit local optical signals in one direction so that the optical path from the transmitter to the third port is unidirectionally open. The signal processing module includes: Central control and processing unit; A receiving unit, one end of which is electrically connected to the central control processing unit, and the other end of which forms a receiving end, is used to receive the remote optical signal through the receiving end and convert the remote optical signal into a first electrical signal to output the first electrical signal to the central control processing unit; and The transmitting unit has one end electrically connected to the main control processing unit and the other end forming the transmitting end. The transmitting unit is used to receive the second electrical signal output by the main control processing unit and convert the second electrical signal into the local optical signal to output the local optical signal to the third port.

2. The transceiver isolation system as described in claim 1, characterized in that, The receiving unit includes: A wavelength demultiplexer, wherein one end of the wavelength demultiplexer forms the receiving end, and the other end includes at least two first output ports, the wavelength demultiplexer being used to receive the remote optical signal through the receiving end and decompose the remote optical signal into at least two first optical beams of different wavelengths, so as to output them respectively through the at least two first output ports; and A communication receiver, one end of which is electrically connected to the central control processing unit, and the other end of which includes at least two first input ports, each of which is optically connected to a first output port, for inputting at least two first optical beams of different wavelengths to convert them into at least two first electrical signals of different frequencies.

3. The transceiver isolation system as described in claim 2, characterized in that, The receiving unit further includes at least two filters, each of which is connected between an input port and an output port.

4. The transceiver isolation system as described in claim 3, characterized in that, The filtering wavelength range of the filter can be adjusted.

5. The transceiver isolation system as described in claim 4, characterized in that, The filter includes: micrometer; and A drive mechanism, which is connected to the micrometer drive, is used to drive the micrometer to rotate, thereby changing the filtering wavelength range of the filter.

6. The transceiver isolation system as described in claim 5, characterized in that, The drive mechanism and the central control processing unit are electrically connected, and are used to drive the micrometer to rotate under the control of the central control processing unit.

7. The transceiver isolation system as described in claim 1, characterized in that, The transmitting unit includes: A communication transmitter, one end of which is electrically connected to the central control processing unit, and the other end of which includes at least two second output ports. The communication transmitter is used to receive at least two second electrical signals of different frequencies output by the central control processing unit, and convert them into at least two second optical beams of different wavelengths, which are then output through the at least two second output ports respectively. A wavelength division multiplexer, one end of which forms the transmitter, and the other end includes at least two second input ports, each of which is optically connected to a second output port, for receiving at least two second optical beams of different wavelengths respectively, so as to couple the at least two second optical beams of different wavelengths into the local optical signal.

8. The transceiver isolation system as described in any one of claims 1 to 7, characterized in that, The first isolator and / or the second isolator are configured as polarization-dependent magneto-optical isolators, which are used for unidirectional transmission of optical signals to rotate the polarization direction of the unidirectional transmitted optical signals by 45°.

9. A wavelength division multiplexing laser communication system, characterized in that, Includes the transceiver isolation system as described in any one of claims 1 to 8.

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