Laser communication transceiving isolation device

Abstract

The invention relates to the technical field of optical transmission, in particular to a laser communication transceiving isolation device which comprises a system front end, a polarization filtering self-adaptive system and a wavelength filtering self-adaptive system. The system front end transmits the signal light after the primary isolation of the local light to a polarization filtering adaptive system; the polarization filtering adaptive system identifies a target polarization state of the signal light, and transmits first target light conforming to the target polarization state to the wavelength filtering adaptive system; and the wavelength filtering adaptive system identifies the target wavelength of the signal light, and takes second target light meeting the target wavelength in the first target light as target signal light filtered and isolated from the local light. Light signal selection is performed on local light from two dimensions of polarization and wavelength, so that any light wave matching is realized, adaptive filtering adjustment is realized according to the dynamic change of a target dimension characteristic value, and isolation of signal light and local light is realized.

Description

Technical Field

[0001] The present invention relates to the field of optical transmission technology, and in particular to a laser communication transceiver isolation device. Background Art

[0002] In the intersatellite laser communication system, after the signal light enters the array antenna, the optical splitter module isolates the transmit and receive beams to prevent local light from affecting the detection, reception and processing of the signal light. Beam transmit and receive isolation is of great significance to the laser communication networking system. It can effectively prevent signal interference and system damage, improve the quality and stability of the communication link, and increase the security and confidentiality of the communication system.

[0003] At present, traditional spectroscopic isolation is still achieved through a spectroscopic optical path composed of spectroscopic components, narrow-band filters and folding mirrors, but spatial optical lenses have disadvantages such as large size, heavy weight, high power consumption, poor isolation ability, and sensitivity to environmental factors, resulting in low system transmission efficiency and large energy loss. In addition, traditional spectroscopic isolation only filters fixed wavelengths, cannot achieve dynamic identification and rapid adjustment of the filtering wavelength, and is not adaptive. On the other hand, the degrees of freedom of light can be divided into wavelength (frequency), phase, polarization and intensity. Single-dimensional filtering cannot meet the matching of arbitrary light waves, resulting in poor system flexibility and compatibility. It is not suitable for the interconnection of heterogeneous constellations, which limits the development of laser communication networking.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a laser communication transceiver isolation device, aiming to solve the technical problem that the optical isolation in the prior art only filters fixed wavelengths and cannot meet the matching of arbitrary light waves.

[0006] To achieve the above object, the present invention proposes a laser communication transceiver isolation device, the laser communication transceiver isolation device comprising: a system front end, a polarization filter adaptive system, and a wavelength filter adaptive system; The first end of the system front end receives local light, the second end of the system front end receives signal light, the third end of the system front end is connected to the first end of the polarization filter adaptive system, and the second end of the polarization filter adaptive system is connected to the first end of the wavelength filter adaptive system; The system front end is used to transmit the signal light after preliminary isolation of the local light to the polarization filtering adaptive system; The polarization filter adaptive system is used to identify the target polarization state of the signal light and transmit the first target light that meets the target polarization state to the wavelength filter adaptive system; The wavelength filtering adaptive system is used to identify the target wavelength of the signal light, and use the second target light in the first target light that meets the target wavelength as the target signal light after being filtered and isolated from the local light.

[0007] Optionally, the laser communication transceiver isolation device further comprises: a power control adaptive system; The second end of the wavelength filtering adaptive system is connected to the first end of the power control adaptive system; The wavelength filtering adaptive system is further used to transmit the target signal light to the power control adaptive system; The power control adaptive system is used to perform power gain control on the target signal light to obtain power-matched target signal light.

[0008] Optionally, the system front end includes: an optical fiber circulator; The first end of the fiber optic circulator receives local light, the second end of the fiber optic circulator receives signal light, and the third end of the fiber optic circulator is connected to the first end of the polarization filtering adaptive system.

[0009] Optionally, the polarization filter adaptive system comprises: a first electrically adjustable polarization filter, a polarization filter controller and a first photodetector; The first end of the first electrically adjustable polarization filter is connected to the third end of the optical fiber circulator, the second end of the first electrically adjustable polarization filter is connected to the first end of the first photodetector and the first end of the wavelength filtering adaptive system, the second end of the first photodetector is connected to the first end of the polarization filter controller, and the second end of the polarization filter controller is connected to the third end of the first electrically adjustable polarization filter.

[0010] Optionally, the wavelength filtering adaptive system comprises: a first electrically tunable wavelength filter, a wavelength filtering controller and a second photodetector; The first end of the first electrically tunable wavelength filter is connected to the second end of the first photodetector, the second end of the first electrically tunable wavelength filter is connected to the first end of the second photodetector and the first end of the power control adaptive system, the second end of the second photodetector is connected to the first end of the wavelength filter controller, and the second end of the wavelength filter controller is connected to the third end of the first electrically tunable wavelength filter.

[0011] Optionally, the power control adaptive system comprises: an erbium-doped fiber amplifier, a power controller and a third photodetector; The first end of the erbium-doped fiber amplifier is connected to the second end of the first electrically tunable wavelength filter, the second end of the erbium-doped fiber amplifier is connected to the first end of the power controller, the second end of the power controller is connected to the first end of the power controller, and the second end of the power controller is connected to the third end of the erbium-doped fiber amplifier.

[0012] Optionally, the wavelength filtering adaptive system further comprises: a second electrically tunable wavelength filter; The first end of the second electrically tunable wavelength filter is connected to the second end of the erbium-doped fiber amplifier, and the second end of the second electrically tunable wavelength filter is connected to the third end of the wavelength filter controller.

[0013] Optionally, the first photodetector is used to obtain the peak power of light passing through the first electrically adjustable polarization filter to obtain the target polarization state of the signal light; The second photodetector is used to obtain the peak power of light passing through the first electrically tunable wavelength filter, and obtain the target wavelength of the signal light.

[0014] Optionally, the polarization filtering adaptive system is coupled with the wavelength filtering adaptive system to construct a dual filtering system; The dual filtering system comprises: a second electrically adjustable polarization filter, a third electrically adjustable wavelength filter, a fourth electrically adjustable wavelength filter, a fourth photodetector and an integrated controller; The first end of the second electrically adjustable polarization filter is connected to the first end of the system front end, the first end of the second electrically adjustable polarization filter is connected to the first end of the third electrically adjustable wavelength filter, the second end of the third electrically adjustable wavelength filter is connected to the first end of the fourth photodetector and the first end of the power control adaptive system, the second end of the power control adaptive system is connected to the first end of the fourth electrically adjustable wavelength filter, the second end of the fourth photodetector is connected to the first end of the integrated controller, and the integrated controller is also respectively connected to the second electrically adjustable polarization filter, the third electrically adjustable wavelength filter, the fourth electrically adjustable wavelength filter and the power control adaptive system.

[0015] Optionally, the fourth photodetector is used to obtain the peak power of light passing through the second electrically tunable polarization filter and the third electrically tunable wavelength filter, and to obtain the target polarization state and target wavelength of the signal light.

[0016] The present invention provides a laser communication transceiver isolation device, which includes: a system front end, a polarization filter adaptive system, and a wavelength filter adaptive system; the first end of the system front end receives local light, the second end of the system front end receives signal light, the third end of the system front end is connected to the first end of the polarization filter adaptive system, and the second end of the polarization filter adaptive system is connected to the first end of the wavelength filter adaptive system. The system front end is used to transmit the signal light after preliminary isolation of the local light to the polarization filter adaptive system; the polarization filter adaptive system is used to identify the target polarization state of the signal light, and transmit the first target light that meets the target polarization state to the wavelength filter adaptive system; the wavelength filter adaptive system is used to identify the target wavelength of the signal light, and the second target light that meets the target wavelength in the first target light is used as the target signal light after filtering and isolation from the local light. The local light is selected from the two dimensions of polarization and wavelength respectively, so as to realize arbitrary light wave matching, and adaptive adjustment filtering is realized according to the dynamic change of the characteristic value of the target dimension, so as to realize the isolation of the signal light and the local light, and the polarization state and wavelength of the target light can be recorded at the same time, so as to facilitate the receiving and processing of the subsequent system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a functional module diagram of the first embodiment of the laser communication transceiver isolation device of the present invention; Figure 2 It is a structural schematic diagram of the system front end in the first embodiment of the laser communication transceiver isolation device of the present invention; Figure 3 This is a functional module diagram of the second embodiment of the laser communication transceiver isolation device of the present invention; Figure 4 It is a structural schematic diagram of a second embodiment of a laser communication transceiver isolation device of the present invention; Figure 5 It is a schematic structural diagram of the third embodiment of the laser communication transceiver isolation device of the present invention.

[0019] Explanation of the accompanying drawings: 10, system front end; 20, polarization filtering adaptive system; 30, wavelength filtering adaptive system; 40, power control adaptive system; 101, optical fiber circulator; 201, first electrically adjustable polarization filter; 202, polarization filtering controller; 203, first photodetector; 301, first electrically adjustable wavelength filter; 302, wavelength filtering controller; 303, second photodetector; 304, second electrically adjustable wavelength filter; 401, erbium-doped fiber amplifier; 402, power controller; 403, third photodetector; 501, second electrically adjustable polarization filter; 502, third electrically adjustable wavelength filter; 503, fourth electrically adjustable wavelength filter; 504, fourth photodetector; 505, integrated controller.

[0020] 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

[0021] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0022] 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.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] Reference Figure 1 , Figure 1 FIG. 1 is a functional module diagram of the first embodiment of the laser communication transceiver isolation device of the present invention, as shown in FIG. Figure 1 As shown, in this embodiment, the laser communication transceiver isolation device includes: a system front end 10, a polarization filtering adaptive system 20, and a wavelength filtering adaptive system 30; the first end of the system front end 10 receives local light 1, the second end of the system front end 10 receives signal light 2, the third end of the system front end 10 is connected to the first end of the polarization filtering adaptive system 20, and the second end of the polarization filtering adaptive system 20 is connected to the first end of the wavelength filtering adaptive system 30.

[0026] It should be noted that the system front end 10 can be used to transmit the signal light after preliminary isolation of the local light to the polarization filter adaptive system 20. The polarization filter adaptive system 20 can be used to identify the target polarization state of the signal light, and transmit the first target light that meets the target polarization state to the wavelength filter adaptive system 30. The wavelength filter adaptive system 30 can be used to identify the target wavelength of the signal light, and use the second target light in the first target light that meets the target wavelength as the target signal light after filtering and isolation from the local light.

[0027] It should be understood that the system front end can receive externally transmitted signal light and input it into the system, and can also emit local light to the outside of the system. In order to prevent the local light from affecting the detection, reception and processing of the signal light, the system front end can perform preliminary isolation of the local light and the signal light through the transmission optical path.

[0028] In one possible implementation, referring to Figure 2 , Figure 2 The schematic diagram of the structure of the system front end in the first embodiment of the laser communication transceiver isolation device of the present invention. The system front end 10 can be a 3-port fiber circulator. The first end of the fiber circulator receives the local light 1, the second end of the fiber circulator receives the signal light 2, and the third end of the fiber circulator is connected to the first end of the polarization filter adaptive system 20, that is, the local light enters the fiber circulator 101 from the first end, and the signal light enters the fiber circulator 101 from the second end. Among them, the characteristics of the 3-port fiber circulator 101 are: the laser incident from the first end is only emitted from the second end, and the laser incident from the second end is only emitted from the third end. Due to the three-port characteristics of the fiber circulator 101, the signal light 2 is emitted from the third end to enter the receiving system, and most of the local light 1 is emitted from the second end, which preliminarily realizes the isolation of the transceiver light beam, but the local light power is usually much higher than the signal light, so part of the local light will leak from the third end to the receiving system.

[0029] It should be noted that the polarization filter adaptive system can monitor the power of polarized light according to the polarization angle of linear polarized light, and then obtain the corresponding peak power according to the polarization state of local light and signal light. When the polarization state of local light and signal light are different, two peak powers will appear. Since the polarization state of local light is known, the polarization state of signal light (that is, the target polarization state) can be distinguished. The polarization filter adaptive system can only allow the polarization state of signal light to pass, thereby isolating the local light by distinguishing the polarization state. The first target light can be the local light after polarization state isolation filtering.

[0030] Furthermore, similar to the above-mentioned polarization filter adaptive system, the wavelength filter adaptive system can cyclically scan the wavelength of a specified band (local light and signal light are usually within a limited band), and then obtain the corresponding peak power according to the different wavelengths of the local light and the signal light. When the wavelengths of the local light and the signal light are different, two peak powers will appear. Since the wavelength of the local light is known, the wavelength of the signal light (that is, the target wavelength) can be distinguished, and the wavelength filter adaptive system can only allow the wavelength of the signal light to pass, thereby isolating the local light by distinguishing the wavelength. The second target light can be the light after the local light has been wavelength-isolated and filtered.

[0031] It should be understood that the wavelength filter adaptive system can adaptively select the wavelength, that is, when the wavelength of the target light changes dynamically, such as the Doppler frequency shift problem that may occur during the transmission of the signal light, the wavelength filter adaptive system will filter the changed wavelength, so as not to affect the subsequent reception and processing. Both the polarization filter adaptive system and the wavelength filter adaptive system can realize adaptive adjustment filtering according to the dynamic changes of the target dimension characteristic value, realize the isolation of the signal light and the local light, and can record the polarization state and wavelength of the target light, which is convenient for the subsequent system to receive and process.

[0032] In this embodiment, the laser communication transceiver isolation device includes: a system front end, a polarization filter adaptive system, and a wavelength filter adaptive system; the first end of the system front end receives local light, the second end of the system front end receives signal light, the third end of the system front end is connected to the first end of the polarization filter adaptive system, and the second end of the polarization filter adaptive system is connected to the first end of the wavelength filter adaptive system. The system front end is used to transmit the signal light after preliminary isolation of the local light to the polarization filter adaptive system; the polarization filter adaptive system is used to identify the target polarization state of the signal light, and transmit the first target light that meets the target polarization state to the wavelength filter adaptive system; the wavelength filter adaptive system is used to identify the target wavelength of the signal light, and use the second target light that meets the target wavelength in the first target light as the target signal light after filtering and isolation from the local light. The local light is selected from the two dimensions of polarization and wavelength respectively, so as to achieve arbitrary light wave matching, and adaptive adjustment filtering is achieved according to the dynamic change of the characteristic value of the target dimension, so as to achieve the isolation of the signal light and the local light, and the polarization state and wavelength of the target light can be recorded at the same time, which is convenient for the subsequent system to receive and process.

[0033] Reference Figure 3 , Figure 3 FIG. 1 is a functional module diagram of the second embodiment of the laser communication transceiver isolation device of the present invention, as shown in FIG. Figure 3 As shown, in this embodiment, the same or similar contents as those in the first embodiment can be referred to the above description, and will not be described in detail later. The laser communication transceiver isolation device also includes: a power control adaptive system 40; the second end of the wavelength filtering adaptive system 30 is connected to the first end of the power control adaptive system 40.

[0034] It should be noted that the wavelength filtering adaptive system 30 can also be used to transmit the target signal light to the power control adaptive system 40; the power control adaptive system 40 can be used to perform power gain control on the target signal light to obtain power-matched target signal light.

[0035] It should be understood that the power control adaptive system 40 can perform power control on the signal light to achieve automatic gain control according to the signal processing requirements of the subsequent system, thereby meeting the power matching requirements.

[0036] In one possible implementation, referring to Figure 4 , Figure 4 The structure diagram of the second embodiment of the laser communication transceiver isolation device of the present invention is shown in FIG. 2. The polarization filter adaptive system 20 comprises: a first electrically adjustable polarization filter 201 , a polarization filter controller 202 and a first photodetector 203 .

[0037] Among them, the first end of the first electrically adjustable polarization filter 201 is connected to the third end of the optical fiber circulator, the second end of the first electrically adjustable polarization filter 201 is connected to the first end of the first photodetector 203 and the first end of the wavelength filtering adaptive system 30, the second end of the first photodetector 203 is connected to the first end of the polarization filter controller 202, and the second end of the polarization filter controller 202 is connected to the third end of the first electrically adjustable polarization filter 201.

[0038] It should be noted that the first electrically adjustable polarization filter 201 performs cyclic scanning according to the polarization angle (0°-180°) of the linear polarized light, and the first photodetector 203 monitors the power of the polarized light passing through the first electrically adjustable polarization filter 201. When the polarization states of the local light and the signal light are different, the first photodetector 203 will have two peak powers. Since the polarization state of the local light is known, the polarization state of the signal light can be distinguished. At this time, the first electrically adjustable polarization filter 201 is locked to the polarization state of the signal light through the polarization filter controller 202, so that the component only allows the polarization state of the signal light to pass, thereby isolating the local light by distinguishing the polarization state.

[0039] Furthermore, the wavelength filter adaptive system 30 includes: a first electrically tunable wavelength filter 301 , a wavelength filter controller 302 and a second photodetector 303 .

[0040] Among them, the first end of the first electrically tunable wavelength filter 301 is connected to the second end of the first photodetector 203, the second end of the first electrically tunable wavelength filter 301 is connected to the first end of the second photodetector 303 and the first end of the power control adaptive system 40, the second end of the second photodetector 303 is connected to the first end of the wavelength filter controller 302, and the second end of the wavelength filter controller 302 is connected to the third end of the first electrically tunable wavelength filter 301.

[0041] It should be noted that the first electrically tunable wavelength filter 301 performs a cyclic scan on the wavelength of the specified band, and the first photodetector 203 monitors the power of the optical signal passing through the first electrically tunable wavelength filter 301. When the wavelengths of the local light and the signal light are different, the first photodetector 203 will have two peak powers. Since the wavelength of the local light is a known quantity, the wavelength of the signal light can be obtained. At this time, the working wavelength of the first electrically tunable wavelength filter 301 is locked to the wavelength of the signal light through the wavelength filter controller 302, that is, only the signal light can pass.

[0042] Furthermore, the wavelength filtering adaptive system 30 also includes: a second electrically tunable wavelength filter 304; a first end of the second electrically tunable wavelength filter 304 is connected to a second end of the erbium-doped fiber amplifier, and a second end of the second electrically tunable wavelength filter 304 is connected to a third end of the wavelength filtering controller 302.

[0043] It should be understood that, compared with the first electrically tunable wavelength filter 301, the second electrically tunable wavelength filter 304 has a narrower line width filtering performance, and can select the target light more finely. The working wavelength of the second electrically tunable wavelength filter 304 is also locked to the target wavelength of the signal light, and the filter can achieve a finer selection of the target wavelength. At this time, the local light has been mostly isolated, and the signal light has been fully retained.

[0044] Furthermore, the power control adaptive system 40 includes: an erbium-doped fiber amplifier 401, a power controller 402, and a third photodetector 403. The first end of the erbium-doped fiber amplifier 401 is connected to the second end of the first electrically tunable wavelength filter 301, the second end of the erbium-doped fiber amplifier 401 is connected to the first end of the power controller 402, the second end of the power controller 402 is connected to the first end of the power controller 402, and the second end of the power controller 402 is connected to the third end of the erbium-doped fiber amplifier 401.

[0045] It should be noted that the erbium-doped fiber amplifier 401 can perform gain amplification on the signal light. At the same time, when subsequent signal processing requires power control of the signal light, the module adds a power controller 402 and a third photodetector 403. Through the real-time feedback of the third photodetector 403, the power controller 402 adjusts the gain coefficient of the erbium-doped fiber amplifier 401, thereby realizing automatic gain control and meeting the power matching requirements.

[0046] It should be understood that in order to further introduce the technical solution in detail, the workflow under different scenarios is explained. Since the polarization state and wavelength of local light and signal light cannot be the same, they are divided into three cases for discussion (the polarization state and wavelength of local light are known quantities). The polarization state of local light is p1 and the wavelength is λ1; the polarization state of signal light is p2 and the wavelength is λ2.

[0047] In the first possible case, p1=p2, λ1≠λ2, when the local light and the signal light have the same polarization state but different wavelengths, after the two beams of light are emitted from the third end of the optical fiber circulator 101, the polarization filtering adaptive system 20 can only monitor light of one polarization state, and the filtering parameter of the first electrically adjustable polarization filter 201 is fixed to p1, so the two beams of light enter the next link without distinction. During the scanning process of the first electrically adjustable wavelength filter 301, two peak powers will appear on the second photodetector 303, which are the local light and the signal light. Since the wavelength of the local light is known, the center wavelength of the two electrically adjustable wavelength filters can be adjusted to the wavelength of the signal light through the wavelength filter controller 302. After passing through the first electrically adjustable wavelength filter 301, most of the local light is isolated, and then the erbium-doped fiber amplifier 401 amplifies the power of the signal light, and the second electrically adjustable wavelength filter 304 further performs narrow-band filtering on the signal light, so that the signal light enters the next receiving and processing system as the main light beam.

[0048] In the second possible case, p1≠p2, λ1=λ2, when the local light and the signal light have the same wavelength but different polarization states, the two beams of light pass through the fiber circulator 101 and enter the polarization filter adaptive system 20, and two peak powers will appear on the first photodetector 203, corresponding to the polarization states of the local light and the signal light respectively. Since the polarization state of the local light is known, the polarization state of the signal light can be determined. At this time, the polarization filter controller 202 controls the first electrically adjustable polarization filter 201 to lock on the polarization state p2 of the target light (signal light), so that only the signal light can pass through the polarization filter adaptive system 20, and the local light is isolated. After entering the wavelength filter adaptive system 30, the main component of the light beam is the signal light, and there is only one target wavelength, so there is only one peak power on the second photodetector 303, and the two wavelength adjustable filters are adjusted to the target wavelength through the wavelength filter controller 302 to filter the signal light. In this case, the wavelength filter adaptive system 30 only retains the existence of the signal light wavelength and excludes the influence of other possible interference light.

[0049] In the third possible situation, p1≠p2, λ1≠λ2, when the local light and the signal light have different polarization states and wavelengths, according to the above description, the polarization filtering adaptive system 20 and the wavelength filtering adaptive system 30 adaptively isolate the local light from the two dimensions of polarization and wavelength respectively, and the signal light is fully retained and amplified, giving play to the dual-dimensional isolation effect of the entire system.

[0050] In this embodiment, the laser communication transceiver isolation device includes: an optical fiber circulator, a first electrically adjustable polarization filter, a polarization filter controller, a first photodetector, a first electrically adjustable wavelength filter, a wavelength filter controller, a second photodetector and a second electrically adjustable wavelength filter. The all-fiber coupling technology is adopted, which greatly reduces the energy loss of the optical signal during the transmission process and improves the overall efficiency of the system. At the same time, each control microsystem adopts closed-loop feedback control and has adaptive adjustment capabilities. This adaptability makes the isolation system very robust in complex environments. A power control module is also provided to automatically gain control the power of the optical signal so that the power of the output optical signal is maintained within a relatively stable range to meet the requirements of subsequent light wave matching. The system has active feature recognition capabilities, can dynamically perceive the wavelength and polarization characteristics of the light wave, realize automatic control of the optical signal, and improve the response speed and processing capacity of the system. At the same time, the functional modules of this scheme are relatively independent, the hardware equipment is relatively large, the algorithm complexity is low, it is easy to implement, and it is suitable for general experimental scenarios.

[0051] Reference Figure 5 , Figure 5 This is a schematic diagram of the structure of the third embodiment of the laser communication transceiver isolation device of the present invention. The third embodiment of the laser communication transceiver isolation device of the present invention is proposed based on the above embodiments. In this embodiment, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be repeated in the following. Figure 5 As shown, the polarization filter adaptive system 20 is coupled with the wavelength filter adaptive system 30 to construct a dual filtering system. The dual filtering system includes: a second electrically adjustable polarization filter 501, a third electrically adjustable wavelength filter 502, a fourth electrically adjustable wavelength filter 503, a fourth photodetector 504 and an integrated controller 505.

[0052] It should be noted that, compared with the structure in the second embodiment of the laser communication transceiver isolation device, this embodiment removes a photodetector, and only a fourth photodetector 504 is provided after the third electrically adjustable wavelength filter 502. The polarization filter controller 202, the wavelength filter controller 302, and the power controller 402 are integrated into an integrated controller 505. The integrated controller 505 needs to coordinate the two dimensions of polarization and wavelength.

[0053] It should be understood that, similar to the second embodiment, the workflow in different scenarios is described, and the polarization states and wavelengths of local light and signal light are divided into three cases for discussion (the polarization state and wavelength of local light are known quantities). The polarization state of local light is p1, and the wavelength is λ1; the polarization state of signal light is p2, and the wavelength is λ2.

[0054] In the first possible case, p1=p2, λ1≠λ2, when the local light and the signal light have the same polarization state but different wavelengths, since the polarization state of the local light is known, the polarization state of the second electrically adjustable polarization filter 501 can be locked to p1, and both light beams can pass through. During the scanning process of the third electrically adjustable wavelength filter 502, in the wavelength dimension, two peak powers will appear on the fourth photodetector 504, which are the wavelengths of the local light and the signal light respectively. Since the wavelength of the local light is known, the integrated controller 505 can further lock the working wavelength of the third electrically adjustable wavelength filter 502 to the wavelength of the signal light to achieve the filtering function. This case is similar to the second embodiment.

[0055] In the second possible case, p1≠p2, λ1=λ2, when the local light and the signal light have the same wavelength but different polarization states, since the wavelength of the local light is known, the working wavelength of the third electrically adjustable wavelength filter 502 can be locked to the wavelength of the local light, that is, in the wavelength dimension, the two beams of light are not distinguished and can both pass through the third electrically adjustable wavelength filter 502. In the polarization dimension, during the scanning process of the second electrically adjustable polarization filter 501, two peak powers will appear on the fourth photodetector 504, one for the local light and the other for the signal light. Since the polarization state of the local light is a known quantity, the integrated controller 505 can lock the polarization state of the second electrically adjustable polarization filter 501 to the signal light, thereby realizing the filtering function. This case is similar to the second embodiment.

[0056] In the third possible situation, p1≠p2, λ1≠λ2, when the polarization state and wavelength of the local light and the signal light are different, the filtering step length of the third electrically adjustable wavelength filter is first set by the integrated controller, that is, the working wavelength of the third electrically adjustable wavelength filter is cyclically scanned in unit length steps within the specified band, and at the same time, in each working wavelength scanning cycle of the third electrically adjustable wavelength filter, the second electrically adjustable polarization filter performs a cyclic scan, so that a dual-dimensional filtering function can be achieved. In the process of coordinated cyclic scanning of the second electrically adjustable polarization filter and the third electrically adjustable wavelength filter, the fourth photodetector will only have peak power when the working polarization state and wavelength of the two filters are both signal light or local light. Since the polarization state and wavelength of the local light are known, the integrated controller can lock the polarization state of the second electrically adjustable polarization filter and the wavelength of the third electrically adjustable wavelength filter as signal light, thereby achieving dual filtering of polarization and wavelength.

[0057] In this embodiment, the laser communication transceiver isolation device includes: a second electrically adjustable polarization filter, a third electrically adjustable wavelength filter, a fourth electrically adjustable wavelength filter, a fourth photodetector, and an integrated controller. Through adaptive control of wavelength, polarization, and power, arbitrary light wave matching in three dimensions is achieved. The hardware integration is high, and the algorithm complexity is also high. It is suitable for scenarios with certain requirements on the volume, weight, and power consumption of hardware equipment.

[0058] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

[0059] Obviously, the described embodiments are only some embodiments of the present invention, not all 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.

[0060] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A laser communication transceiver isolation device, characterized in that: The laser communication transceiver isolation device comprises: a system front end, a polarization filter adaptive system, and a wavelength filter adaptive system; The first end of the system front end receives local light, the second end of the system front end receives signal light, the third end of the system front end is connected to the first end of the polarization filter adaptive system, and the second end of the polarization filter adaptive system is connected to the first end of the wavelength filter adaptive system; The system front end is used to transmit the signal light after preliminary isolation of the local light to the polarization filtering adaptive system; The polarization filter adaptive system is used to identify the target polarization state of the signal light and transmit the first target light that meets the target polarization state to the wavelength filter adaptive system; The wavelength filtering adaptive system is used to identify the target wavelength of the signal light, and use the second target light in the first target light that meets the target wavelength as the target signal light after being filtered and isolated from the local light.

2. The laser communication transceiver isolation device according to claim 1, characterized in that: The laser communication transceiver isolation device further includes: a power control adaptive system; The second end of the wavelength filtering adaptive system is connected to the first end of the power control adaptive system; The wavelength filtering adaptive system is further used to transmit the target signal light to the power control adaptive system; The power control adaptive system is used to perform power gain control on the target signal light to obtain power-matched target signal light.

3. The laser communication transceiver isolation device according to claim 2, characterized in that: The system front end includes: an optical fiber circulator; The first end of the fiber optic circulator receives local light, the second end of the fiber optic circulator receives signal light, and the third end of the fiber optic circulator is connected to the first end of the polarization filtering adaptive system.

4. The laser communication transceiver isolation device according to claim 3, characterized in that: The polarization filter adaptive system comprises: a first electrically adjustable polarization filter, a polarization filter controller and a first photodetector; The first end of the first electrically adjustable polarization filter is connected to the third end of the optical fiber circulator, the second end of the first electrically adjustable polarization filter is connected to the first end of the first photodetector and the first end of the wavelength filtering adaptive system, the second end of the first photodetector is connected to the first end of the polarization filter controller, and the second end of the polarization filter controller is connected to the third end of the first electrically adjustable polarization filter.

5. The laser communication transceiver isolation device according to claim 4, characterized in that: The wavelength filtering adaptive system comprises: a first electrically adjustable wavelength filter, a wavelength filtering controller and a second photoelectric detector; The first end of the first electrically tunable wavelength filter is connected to the second end of the first photodetector, the second end of the first electrically tunable wavelength filter is connected to the first end of the second photodetector and the first end of the power control adaptive system, the second end of the second photodetector is connected to the first end of the wavelength filter controller, and the second end of the wavelength filter controller is connected to the third end of the first electrically tunable wavelength filter.

6. The laser communication transceiver isolation device according to claim 5, characterized in that: The power control adaptive system comprises: an erbium-doped fiber amplifier, a power controller and a third photodetector; The first end of the erbium-doped fiber amplifier is connected to the second end of the first electrically tunable wavelength filter, the second end of the erbium-doped fiber amplifier is connected to the first end of the power controller, the second end of the power controller is connected to the first end of the power controller, and the second end of the power controller is connected to the third end of the erbium-doped fiber amplifier.

7. The laser communication transceiver isolation device according to claim 6, characterized in that: The wavelength filtering adaptive system further comprises: a second electrically tunable wavelength filter; The first end of the second electrically tunable wavelength filter is connected to the second end of the erbium-doped fiber amplifier, and the second end of the second electrically tunable wavelength filter is connected to the third end of the wavelength filter controller.

8. The laser communication transceiver isolation device according to claim 7, characterized in that: The first photodetector is used to obtain the peak power of light passing through the first electrically adjustable polarization filter, and obtain the target polarization state of the signal light; The second photodetector is used to obtain the peak power of light passing through the first electrically tunable wavelength filter, and obtain the target wavelength of the signal light.

9. The laser communication transceiver isolation device according to claim 2, characterized in that: The polarization filter adaptive system is coupled with the wavelength filter adaptive system to construct a dual filtering system; The dual filtering system comprises: a second electrically adjustable polarization filter, a third electrically adjustable wavelength filter, a fourth electrically adjustable wavelength filter, a fourth photodetector and an integrated controller; The first end of the second electrically adjustable polarization filter is connected to the first end of the system front end, the first end of the second electrically adjustable polarization filter is connected to the first end of the third electrically adjustable wavelength filter, the second end of the third electrically adjustable wavelength filter is connected to the first end of the fourth photodetector and the first end of the power control adaptive system, the second end of the power control adaptive system is connected to the first end of the fourth electrically adjustable wavelength filter, the second end of the fourth photodetector is connected to the first end of the integrated controller, and the integrated controller is also respectively connected to the second electrically adjustable polarization filter, the third electrically adjustable wavelength filter, the fourth electrically adjustable wavelength filter and the power control adaptive system.

10. The laser communication transceiver isolation device according to claim 9, characterized in that: The fourth photodetector is used to obtain the peak power of light passing through the second electrically tunable polarization filter and the third electrically tunable wavelength filter, and to obtain the target polarization state and target wavelength of the signal light.

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