Transmit-receive isolation system and wavelength division multiplexing laser communication system

Abstract

The invention discloses a transmit-receive isolation system, and relates to the technical field of laser communication, a circulator of the transmit-receive isolation system comprises a first port, a second port and a third port, the first port is provided with a transmit-receive antenna, a light path from the first port to the second port is unidirectionally conducted, and a light path from the third port to the first port is unidirectionally conducted; the transceiving antenna is arranged at the first port; the signal processing module comprises a receiving end and a transmitting end; the first isolator is arranged between the second port and the receiving end, is in optical fiber connection with the second port and the receiving end, and is used for transmitting a remote optical signal in a one-way manner; the second isolator is arranged between the third port and the transmitting end, is in optical fiber connection with the third port and the transmitting end, and is used for transmitting a local optical signal in a one-way manner; according to the technical scheme of the invention, the invention provides the transmit-receive isolation system which is not limited by spatial light path arrangement.

Description

Technical Field

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

[0002] In the field of laser communication, the traditional transceiver isolation system mainly relies on a large number of spatial optical lenses to achieve the isolation and splitting between the received optical signal and the transmitted optical signal. Limited by the arrangement of the spatial optical path, the traditional transceiver isolation system requires complex spatial optical path design, which also leads to problems such as large size, high weight, and poor reliability of the transceiver isolation system, making it difficult to effectively integrate the system. Summary of the invention

[0003] The main purpose of the present invention is to propose a transceiver isolation system and a wavelength division multiplexing laser communication system, aiming to provide a transceiver isolation system that is not restricted by the spatial optical path arrangement.

[0004] To achieve the above object, the transmitting and receiving isolation system proposed in the present invention comprises:

[0005] A circulator, the circulator comprising 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 being disposed at the first port and being used for receiving a remote optical signal and transmitting a local optical signal;

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

[0008] a first isolator, the first isolator being disposed between the second port and the receiving end and being connected to the second port and the receiving end optical fiber respectively, the first isolator being used for unidirectionally transmitting a remote optical signal so that an optical path from the second port to the receiving end is unidirectionally conductive; and

[0009] The second isolator is arranged between the third port and the transmitting end and is respectively connected to the third port and the transmitting end optical fiber, and the second isolator is used for unidirectionally transmitting the local optical signal so that the optical path from the transmitting end to the third port is unidirectionally conductive.

[0010] In one embodiment, the signal processing module includes:

[0011] Master control processing unit;

[0012] a receiving unit, one end of which is electrically connected to the master control processing unit and the other end of which is formed with the receiving end, the receiving unit being used 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 master control processing unit; and

[0013] A transmitting unit, one end of which is electrically connected to the master control processing unit, and the other end of which is provided with the transmitting end, wherein the receiving unit is used to receive a second electrical signal output by the master 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 one embodiment, the receiving unit includes:

[0015] A wavelength division multiplexer, wherein one end of the wavelength division multiplexer is formed with the receiving end, and the other end includes at least two first output ports, the wavelength division multiplexer is used to receive the remote optical signal through the receiving end, and decompose the remote optical signal into at least two first optical beams with different wavelengths, so as to output them respectively through at least two first output ports; and

[0016] A communication receiver, one end of which is electrically connected to the master control processing unit, and the other end of which includes at least two first input ports, each of which is optically connected to one of the first output ports, and is used to input at least two first light beams of different wavelengths respectively, so as to convert the first electrical signals of at least two different frequencies.

[0017] In one embodiment, the receiving unit further includes at least two filters, each of which is connected between one of the input ports and one of the output ports.

[0018] In one embodiment, the filtering wavelength range of the filter is adjustable.

[0019] In one embodiment, the filter comprises:

[0020] Micrometer; and

[0021] A driving mechanism is connected to the micrometer in a driving manner and is used to drive the micrometer to rotate so as to change the filtering wavelength range of the filter.

[0022] In one embodiment, the driving mechanism is electrically connected to the master control processing unit, and is used to drive the micrometer to rotate under the control of the master control processing unit.

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

[0024] A communication transmitter, wherein one end of the communication receiver is electrically connected to the master control processing unit, and the other end includes at least two second output ports, the communication receiver is used to receive at least two second electrical signals of different frequencies output by the master control processing unit, and convert them into at least two second optical beams of different wavelengths, so as to be outputted respectively through at least two second output ports; and

[0025] A wavelength division multiplexer, one end of which forms the transmitting end, and the other end of which includes at least two second input ports, each of which is connected to a second output port by an optical fiber, and is used to respectively receive at least two second optical beams of different wavelengths, so as to couple at least two second optical beams of different wavelengths into the local optical signal.

[0026] In one embodiment, the first isolator and / or the second isolator is configured as a polarization-dependent magneto-optical isolator, which is used for unidirectionally transmitting an optical signal so that the polarization direction of the unidirectionally transmitted optical signal is rotated by 45°.

[0027] The present invention further provides a wavelength division multiplexing laser communication system, comprising any one of the aforementioned transceiver isolation systems, wherein the transceiver isolation system comprises:

[0028] A circulator, the circulator comprising a first port, a second port and a third port, the first port being provided with the transceiver antenna, an optical path from the first port to the second port being unidirectional, and an optical path from the third port to the first port being unidirectional;

[0029] a transceiver antenna, the transceiver antenna being disposed at the first port and being used for receiving a remote optical signal and transmitting a local optical signal;

[0030] A signal processing module, wherein the signal processing module includes a receiving end and a transmitting end;

[0031] a first isolator, the first isolator being disposed between the second port and the receiving end and being connected to the second port and the receiving end optical fiber respectively, the first isolator being used for unidirectionally transmitting a remote optical signal so that an optical path from the second port to the receiving end is unidirectionally conductive; and

[0032] The second isolator is arranged between the third port and the transmitting end and is respectively connected to the third port and the transmitting end optical fiber, and the second isolator is used for unidirectionally transmitting the local optical signal so that the optical path from the transmitting end to the third port is unidirectionally conductive.

[0033] The transceiver isolation system of the technical solution of the present invention includes a circulator, a transceiver antenna, a signal processing module, a first isolator and a second isolator, wherein the circulator includes 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 transceiver isolation system receives remote light, the remote light in the space can be coupled to a remote light signal in the optical fiber through the transceiver antenna, and the remote light signal can be transmitted unidirectionally from the first port to the second port in the circulator, and the remote light signal can be transmitted unidirectionally from the second port to the receiving end of the signal processing module through the first isolator; similarly, when the transceiver isolation system transmits remote light, the transmitting end of the signal processing module can output a local light signal, and transmit unidirectionally from the transmitting end of the signal processing module to the third port through the second isolator, and transmit unidirectionally from the third port to the first port through the circulator, so as to couple the local light signal in the optical fiber into the local light in the space through the transceiver antenna. In this way, a mutually isolated local optical signal transmission optical path and a remote optical signal receiving optical path can be constructed to respectively realize the directional transmission of the local optical signal and the remote optical signal. Since both the transmission optical path and the receiving optical path are constructed by optical fiber devices without the need for spatial optical lenses, they are not restricted by the arrangement of spatial optical paths, thereby making the structure of the transceiver isolation system more compact, which is conducive to reducing the volume and weight of the transceiver isolation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 A schematic structural diagram of an embodiment of a transceiver isolation system provided by the present invention;

[0036] Figure 2 for Figure 1 A partial enlarged view of the transceiver isolation system;

[0037] Figure 3 for Figure 1 Schematic diagram of the structure of the circulator;

[0038] Figure 4 for Figure 1 Schematic diagram of the structure of the first isolator.

[0039] Description of Figure Numbers:

[0040] 100, transceiver isolation system; 10, circulator; 11, first port; 12, second port; 13, third port; 20, transceiver antenna; 30, signal processing module; 31, master control processing unit; 32, receiving unit; 321, wavelength division multiplexer; 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 realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] In the field of laser communication, the traditional transceiver isolation system mainly relies on a large number of spatial optical lenses to achieve the isolation and splitting between the received optical signal and the transmitted optical signal. Limited by the arrangement of the spatial optical path, the traditional transceiver isolation system requires complex spatial optical path design, which also leads to problems such as large size, high weight, and poor reliability of the transceiver isolation system, making it difficult to effectively integrate the system.

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

[0047] See also Figure 1 and Figure 2 In one embodiment of the present invention, the transceiver isolation system 100 includes:

[0048] A circulator 10, wherein the circulator 10 comprises a first port 11, a second port 12 and a third port 13, wherein an optical path from the first port 11 to the second port 12 is unidirectional, and an optical path from the third port 13 to the first port 11 is unidirectional;

[0049] a transceiver antenna 20, the transceiver antenna 20 being disposed at the first port 11 and configured to receive remote optical signals and transmit local optical signals;

[0050] A signal processing module 30, wherein the signal processing module 30 includes a receiving end 321a and a transmitting end 332a;

[0051] a first isolator 40, which is disposed between the second port 12 and the receiving end 321a and is optically connected to the second port 12 and the receiving end 321a, respectively, and is used for unidirectionally transmitting a remote optical signal so that the optical path from the second port 12 to the receiving end 321a is unidirectionally conductive; and

[0052] The second isolator 50 is arranged between the third port 13 and the transmitting end 332a, and is respectively connected to the third port 13 and the transmitting end 332a by optical fiber. The second isolator 50 is used for unidirectionally transmitting local optical signals 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 solution of the present invention includes 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 includes 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 transceiver isolation system 100 receives remote light, the remote light in the space can be coupled into a remote optical signal in the optical fiber through the transceiver antenna 20, and the remote optical signal can be transmitted unidirectionally from the first port 11 to the second port 12 in the circulator 10, and the remote optical signal can be transmitted 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 transceiver isolation system 100 transmits remote light, the transmitting end 332a of the signal processing module 30 can output a local optical signal, and transmit it unidirectionally from the transmitting end 332a of the signal processing module 30 to the third port 13 through the second isolator 50, and transmit it unidirectionally from the third port 13 to the first port 11 through the circulator 10, so as to couple the local optical signal in the optical fiber into local light in space through the transceiver antenna 20.

[0056] With such an arrangement, a mutually isolated local optical signal transmitting optical path and a remote optical signal receiving optical path can be constructed to respectively realize the directional transmission of the local optical signal and the remote optical signal, and effectively suppress reverse optical interference to realize the first-level isolation of the transmitting and receiving light beams.

[0057] It can be understood that since both the transmitting optical path and the receiving optical path are constructed by optical fiber devices without the need for spatial optical lenses, they are not restricted by the arrangement of the spatial optical paths, thereby making the structure of the transceiver isolation system 100 more compact, which is beneficial to reducing the volume and weight of the transceiver isolation system 100.

[0058] See also Figure 1 and Figure 2 In an embodiment of the present invention, the signal processing module 30 includes:

[0059] A master control processing unit 31;

[0060] a receiving unit 32, one end of which is electrically connected to the master control processing unit 31, and the other end of which is formed with the receiving end 321a, the receiving unit 32 is used to receive the remote optical signal through the receiving end 321a, and convert the remote optical signal into a first electrical signal, so as to output the first electrical signal to the master control processing unit 31; and

[0061] The transmitting unit 33 has one end electrically connected to the master control processing unit 31, and the other end forms the transmitting end 332a. The receiving unit 32 is used to receive the second electrical signal output by the master control processing unit 31, and convert the second electrical signal into the local optical signal to output the local optical signal to the third port 13.

[0062] With such a configuration, when the transceiver antenna 20 couples the remote light in the space into a remote optical signal in the optical fiber, the photoelectric conversion of the remote optical signal can be realized through the receiving unit 32, so that the first electrical signal converted from the remote optical signal can be obtained, so that the master control processing unit 31 can collect, control and process the first electrical signal.

[0063] The master control processing unit 31 can also be used to output a second electrical signal, and can realize electrical-optical conversion of the second electrical signal through the transmitting unit 33, so as to obtain a local optical signal converted from the second electrical signal, and then the local optical signal can be coupled out into local light in space through the transceiver antenna 20, so as to realize laser communication through long-distance and high-speed transmission of spatial light.

[0064] Furthermore, the technical solution of the present invention, in addition to realizing the primary isolation of the transceiver isolation system 100 through the circulator 10, the first isolator 40 and the second isolator 50 in the aforementioned embodiment, can also utilize the characteristics of the wavelength division multiplexer 321 and / or the wavelength division multiplexer 332 in the subsequent embodiments to enable the transceiver isolation system 100 to realize the separate transmission of light beams of specific wavelengths, thereby effectively improving the isolation degree of the transceiver isolation system 100.

[0065] Specifically, see Figure 2 In an embodiment of the present invention, the receiving unit 32 includes:

[0066] a wavelength division multiplexer 321, wherein one end of the wavelength division multiplexer 321 is formed with the receiving end 321a, and the other end includes at least two first output ports 321b, and the wavelength division multiplexer 332 is used to receive the remote optical signal through the receiving end 321a, and decompose the remote optical signal into at least two first optical beams with different wavelengths, so as to output them respectively through at least two first output ports 321b; and

[0067] A communication receiver 322, one end of which is electrically connected to the master control processing unit 31, and the other end of which includes at least two first input ports 322a, each of which is connected to a first output port 321b by an optical fiber, and is used to respectively input at least two first light beams of different wavelengths to convert into at least two first electrical signals of different frequencies.

[0068] The receiving end 321a of the WDM 321 can be connected to the first isolator 40 via 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 via a coupling optical fiber.

[0069] In some embodiments, the wavelength division multiplexer 321 includes N first output ports 321b, which can decompose the remote optical signal into first optical beams of multiple wavelengths, namely: R1, R2, R3, R4...Rn, and make the first optical beams of multiple wavelengths enter the N first input ports 322a of the communication receiver 322 respectively, and then convert the first optical beams of multiple wavelengths into first electrical signals of multiple frequencies through optoelectronic conversion by the communication receiver 322.

[0070] See also Figure 2 In an embodiment of the present invention, the receiving unit 32 further includes at least two filters 323, each of the filters 323 is connected between one of the input ports and one of the output ports.

[0071] In this way, the receiving unit 32 may include a filter group 323 consisting of at least two filters 323 , thereby facilitating filtering the first light beam of a specific wavelength through filters 323 with different calibrations in the filter group 323 .

[0072] In the embodiment of the present invention, the filtering wavelength range of the filter 323 can be adjusted.

[0073] In this way, the filter 323 can be configured as a tunable filter 323 that can filter a light beam of a specific wavelength and isolate light beams of other wavelengths.

[0074] Specifically, after the wavelength division multiplexer 321 decomposes the remote optical signal into first optical beams of different wavelengths, each first optical beam may enter a corresponding tunable filter 323, thereby achieving effective isolation between the first optical beams of different wavelengths.

[0075] In an embodiment of the present invention, the filter 323 includes:

[0076] Micrometer; and

[0077] A driving mechanism is connected to the micrometer and is used to drive the micrometer to rotate so as to change the filtering wavelength range of the filter 323.

[0078] The driving mechanism can drive the micrometer of the filter 323 to rotate a specific angle to filter a specific wavelength and isolate other wavelength beams. Since the number of adjustable filters 323 in the filter 323 group is set and adjusted according to the number of first light beams decomposed by the wavelength division multiplexer 321, and the filtering wavelength range of each adjustable filter 323 can be adjusted separately, the receiving unit 32 can be reconfigured and easily reconfigured.

[0079] See also Figure 2In an embodiment of the present invention, the driving mechanism is electrically connected to the master control processing unit 31 and is used to drive the micrometer to rotate under the control of the master control processing unit 31.

[0080] In this way, the filtering wavelength range of each filter 323 in the filter group 323 can be independently adjusted by the master control processing unit 31 in an electrically controlled manner to achieve secondary isolation of the transmitted and received light beams, thereby achieving secondary isolation of the transmitted and received light beams by the electrically controlled adjustable filter group 323.

[0081] See also Figure 2 In an embodiment of the present invention, the transmitting unit 33 includes:

[0082] a communication transmitter 331, wherein one end of the communication receiver 322 is electrically connected to the master control processing unit 31, and the other end includes at least two second output ports 331a, wherein the communication receiver 322 is used to receive at least two second electrical signals of different frequencies output by the master control processing unit 31, and convert them into at least two second optical beams of different wavelengths, so as to be outputted respectively through at least two second output ports 331a; and

[0083] A wavelength division multiplexer 332, one end of which forms the transmitting end 332a, and the other end includes at least two second input ports 332b, each of which is connected to a second output port 331a by an optical fiber, and is used to respectively receive at least two second optical beams of different wavelengths, so as to couple at least two second optical beams of different wavelengths into the local optical signal.

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

[0085] In some embodiments, the communication transmitter 331 includes N second output ports 331a, which are used to convert the second electrical signals of multiple frequencies emitted by the master control processing unit 31 into second optical beams of multiple wavelengths, namely: R1, R2, R3, R4...Rn, and make the second optical beams of multiple wavelengths enter the N second input ports 332b of the wavelength division multiplexer 332 respectively, and then couple the second optical beams of multiple wavelengths into local optical signals through the wavelength division multiplexer 332.

[0086] See also Figure 4In an embodiment of the present invention, the first isolator 40 and / or the second isolator 50 is configured as a polarization-dependent magneto-optical isolator, which is used for unidirectionally transmitting optical signals so that the polarization direction of the unidirectionally transmitted 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, an annular permanent magnet and a magneto-optical material along the axial direction. The magneto-optical material is usually fixed at the center of the annular magnet, and the two together form a 45° Faraday rotator (FR), and the light transmission direction angle between the polarizer and the analyzer is 45°.

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

[0089] Furthermore, due to the non-reciprocity of the magneto-optical effect, when the optical signal is incident in the reverse direction along the magnetic field, the linear polarized light emitted from the analyzer passes through the 45° Faraday rotator, and its polarization direction continues to rotate 45° along the same rotation direction as before. At this time, the angle between the polarization direction and the polarizer is 90°, so that the optical signal incident in the reverse direction cannot pass through the polarization-dependent magneto-optical isolator. In this way, the polarization-dependent magneto-optical isolator can achieve the effect of forward transmission of optical signals incident in the forward direction along the magnetic field direction, and reverse isolation of optical signals incident in the reverse direction along the magnetic field direction.

[0090] Of course, the technical solution of the present invention is not limited thereto. In some embodiments, the first isolator 40 and / or the second isolator 50 may also be configured as a polarization-independent magneto-optical isolator, which is not limited here.

[0091] It can be understood that by providing 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, bidirectional transmission isolation of the optical signal.

[0092] The present invention also proposes a wavelength division multiplexing laser communication system, which includes a transceiver isolation system 100. The specific structure of the transceiver isolation system 100 refers to the above embodiment. Since the wavelength division multiplexing laser communication system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0093] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention and the drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transceiver isolation system, characterized in that: include: A circulator, the circulator comprising 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; a transceiver antenna, the transceiver antenna being disposed at the first port and being used for receiving a remote optical signal and transmitting a local optical signal; A signal processing module, wherein the signal processing module includes a receiving end and a transmitting end; a first isolator, the first isolator being disposed between the second port and the receiving end and being connected to the second port and the receiving end optical fiber respectively, the first isolator being used for unidirectional transmission of remote optical signals so that the optical path from the second port to the receiving end is unidirectionally conductive; as well as The second isolator is arranged between the third port and the transmitting end and is respectively connected to the third port and the transmitting end optical fiber, and the second isolator is used for unidirectionally transmitting the local optical signal so that the optical path from the transmitting end to the third port is unidirectionally conductive.

2. The transceiver isolation system according to claim 1, characterized in that: The signal processing module comprises: Master control processing unit; a receiving unit, one end of which is electrically connected to the master control processing unit and the other end of which is formed with the receiving end, the receiving unit being used 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 master control processing unit; and A transmitting unit, one end of which is electrically connected to the master control processing unit, and the other end of which is provided with the transmitting end, wherein the receiving unit is used to receive a second electrical signal output by the master 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.

3. The transceiver isolation system according to claim 2, characterized in that: The receiving unit comprises: a wavelength division multiplexer, wherein one end of the wavelength division multiplexer is formed with the receiving end, and the other end includes at least two first output ports, the wavelength division multiplexer is 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 at least two first output ports; and A communication receiver, one end of which is electrically connected to the master control processing unit, and the other end of which includes at least two first input ports, each of which is optically connected to one of the first output ports, and is used to input at least two first light beams of different wavelengths respectively, so as to convert the first electrical signals of at least two different frequencies.

4. The transceiver isolation system according to claim 3, characterized in that: The receiving unit further includes at least two filters, each of which is connected between one of the input ports and one of the output ports.

5. The transceiver isolation system according to claim 4, characterized in that: The filtering wavelength range of the filter can be adjusted.

6. The transceiver isolation system according to claim 5, characterized in that: The filter comprises: Micrometer; and A driving mechanism is connected to the micrometer in a driving manner and is used to drive the micrometer to rotate so as to change the filtering wavelength range of the filter.

7. The transceiver isolation system according to claim 6, characterized in that: The driving mechanism is electrically connected to the master control processing unit and is used to drive the micrometer to rotate under the control of the master control processing unit.

8. The transceiver isolation system according to claim 2, characterized in that: The transmitting unit comprises: A communication transmitter, wherein one end of the communication receiver is electrically connected to the master control processing unit, and the other end includes at least two second output ports, the communication receiver is used to receive at least two second electrical signals of different frequencies output by the master control processing unit, and convert them into at least two second optical beams of different wavelengths, so as to be outputted respectively through at least two second output ports; and A wavelength division multiplexer, one end of which forms the transmitting end, and the other end of which includes at least two second input ports, each of which is connected to a second output port by an optical fiber, and is used to respectively receive at least two second optical beams of different wavelengths, so as to couple at least two second optical beams of different wavelengths into the local optical signal.

9. The transmitting and receiving isolation system according to any one of claims 1 to 8, characterized in that: The first isolator and / or the second isolator is configured as a polarization-dependent magneto-optical isolator, and the polarization-dependent magneto-optical isolator is used for unidirectionally transmitting an optical signal so that the polarization direction of the unidirectionally transmitted optical signal is rotated by 45°.

10. A wavelength division multiplexing laser communication system, characterized in that: The invention comprises a transceiver isolation system as claimed in any one of claims 1 to 9.

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