A laser communication transceiver isolation device

Abstract

The present invention relates to the field of optical transmission technology, and particularly to a laser communication transceiver isolation device. The laser communication transceiver isolation device includes: a system front end, a polarization filtering adaptive system, and a wavelength filtering adaptive system. The system front end transmits the signal light after preliminary isolation of the local light to the polarization filtering adaptive system; the polarization filtering adaptive system identifies the target polarization state of the signal light and transmits the first target light that conforms to the target polarization state to the wavelength filtering adaptive system; the wavelength filtering adaptive system identifies the target wavelength of the signal light and uses the second target light that conforms to the target wavelength in the first target light as the target signal light that is filtered and isolated from the local light. Optical signal selection is performed on the local light from two dimensions of polarization and wavelength respectively, thereby achieving arbitrary optical wave matching, and adaptive adjustment filtering is achieved according to the dynamic change of the target dimension feature value, so as to realize the isolation of the signal light and the local light.

Description

Technical Field

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

[0002] In an inter-satellite laser communication system, after the signal light enters the array antenna, the beam splitting module is used to isolate the received and transmitted light beams to prevent the local light from affecting the detection, reception, and processing of the signal light. Beam transceiver isolation is of great significance for a laser communication networking system. Beam transceiver isolation can effectively prevent signal interference and system damage, improve the quality and stability of the communication link, and enhance the security and confidentiality of the communication system.

[0003] Currently, traditional beam splitting isolation is still achieved through a beam splitting optical path composed of beam splitting components, narrowband filters, and an anastigmat. However, spatial light lenses have disadvantages such as large volume, 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 beam splitting isolation only filters for a fixed wavelength, unable to achieve dynamic identification and rapid adjustment of the filtering wavelength, lacking self-adaptability. 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, not being applicable to the interconnection and interoperability of heterogeneous constellations, and restricting the development of laser communication networking.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

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

[0006] To achieve the above objective, the present invention proposes a laser communication transceiver isolation device, which includes: a system front end, a polarization filtering adaptive system, and a wavelength filtering adaptive system;

[0007] 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 filtering adaptive system, and the second end of the polarization filtering adaptive system is connected to the first end of the wavelength filtering adaptive system;

[0008] The system front end is used to transmit the signal light after initially isolating the local light to the polarization filtering adaptive system;

[0009] The polarization filtering adaptive system is used to identify the target polarization state of the signal light and transmit the first target light that conforms to the target polarization state to the wavelength filtering adaptive system;

[0010] The wavelength filtering adaptive system is used to identify the target wavelength of the signal light and use the second target light that conforms to the target wavelength in the first target light as the target signal light after filtering and isolating from the local light.

[0011] Optionally, the laser communication transceiver isolation device further includes: a power control adaptive system;

[0012] The second end of the wavelength filtering adaptive system is connected to the first end of the power control adaptive system;

[0013] The wavelength filtering adaptive system is further used to transmit the target signal light to the power control adaptive system;

[0014] The power control adaptive system is used to perform power gain regulation on the target signal light to obtain a target signal light with power matching.

[0015] Optionally, the front end of the system includes: an optical fiber circulator;

[0016] The first end of the optical fiber circulator receives the local light, the second end of the optical fiber circulator receives the signal light, and the third end of the optical fiber circulator is connected to the first end of the polarization filtering adaptive system.

[0017] Optionally, the polarization filtering adaptive system includes: a first electrically tunable polarization filter, a polarization filtering controller, and a first photodetector;

[0018] The first end of the first electrically tunable polarization filter is connected to the third end of the optical fiber circulator, the second end of the first electrically tunable 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 filtering controller, and the second end of the polarization filtering controller is connected to the third end of the first electrically tunable polarization filter.

[0019] Optionally, the wavelength filtering adaptive system includes: a first electrically tunable wavelength filter, a wavelength filtering controller, and a second photodetector;

[0020] 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 filtering controller. The second end of the wavelength filtering controller is connected to the third end of the first electrically tunable wavelength filter.

[0021] Optionally, the power control adaptive system includes: an erbium-doped fiber amplifier, a power controller, and a third photodetector;

[0022] 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. The second end of the power controller is connected to the third end of the erbium-doped fiber amplifier.

[0023] Optionally, the wavelength filtering adaptive system further includes: a second electrically tunable wavelength filter;

[0024] The first end of the second electrically tunable wavelength filter is connected to the second end of the erbium-doped fiber amplifier. The second end of the second electrically tunable wavelength filter is connected to the third end of the wavelength filtering controller.

[0025] Optionally, the first photodetector is used to obtain the peak power of the light passing through the first electrically tunable polarization filter and obtain the target polarization state of the signal light;

[0026] The second photodetector is used to obtain the peak power of the light passing through the first electrically tunable wavelength filter and obtain the target wavelength of the signal light.

[0027] Optionally, the polarization filtering adaptive system and the wavelength filtering adaptive system are coupled to construct a dual filtering system;

[0028] The dual filtering system includes: a second electrically tunable polarization filter, a third electrically tunable wavelength filter, a fourth electrically tunable wavelength filter, a fourth photodetector, and an integrated controller;

[0029] The first end of the second electrically tunable polarization filter is connected to the first end of the front end of the system. The first end of the second electrically tunable polarization filter is connected to the first end of the third electrically tunable wavelength filter. The second end of the third electrically tunable 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 tunable wavelength filter. The second end of the fourth photodetector is connected to the first end of the integrated controller. The integrated controller is also respectively connected to the second electrically tunable polarization filter, the third electrically tunable wavelength filter, the fourth electrically tunable wavelength filter, and the power control adaptive system.

[0030] Optionally, the fourth photodetector is configured to obtain the peak power of the light passing through the second electrically tunable polarization filter and the third electrically tunable wavelength filter, and obtain the target polarization state and the target wavelength of the signal light.

[0031] The present invention provides a laser communication transceiver isolation device, which includes: a front end of the system, a polarization filtering adaptive system, and a wavelength filtering adaptive system. The first end of the front end of the system receives local light, the second end of the front end of the system receives signal light, and the third end of the front end of the system is connected to the first end of the polarization filtering adaptive system. The second end of the polarization filtering adaptive system is connected to the first end of the wavelength filtering adaptive system. The front end of the system is configured to transmit the signal light after initially isolating the local light to the polarization filtering adaptive system. The polarization filtering adaptive system is configured to identify the target polarization state of the signal light and transmit the first target light that conforms to the target polarization state to the wavelength filtering adaptive system. The wavelength filtering adaptive system is configured to identify the target wavelength of the signal light and use the second target light that conforms to the target wavelength in the first target light as the target signal light that is filtered and isolated from the local light. The optical signal selection of the local light is performed from two dimensions of polarization and wavelength respectively, so as to realize arbitrary optical wave matching, and the adaptive adjustment filtering is realized according to the dynamic change of the target dimension characteristic value, so as to realize the isolation between the signal light and the local light. At the same time, the polarization state and wavelength of the target light can be recorded, which is convenient for the subsequent reception and processing of the system. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0033] Figure 1 This is the functional block diagram of the first embodiment of the laser communication transceiver isolation device of the present invention;

[0034] Figure 2 This is the structural schematic diagram of the front end of the system in the first embodiment of the laser communication transceiver isolation device of the present invention;

[0035] Figure 3 This is the functional block diagram of the second embodiment of the laser communication transceiver isolation device of the present invention;

[0036] Figure 4 This is the structural schematic diagram of the second embodiment of the laser communication transceiver isolation device of the present invention;

[0037] Figure 5 This is the structural schematic diagram of the third embodiment of the laser communication transceiver isolation device of the present invention.

[0038] Explanation of the reference numerals in the drawings: 10, front end of the system; 20, polarization filtering adaptive system; 30, wavelength filtering adaptive system; 40, power control adaptive system; 101, fiber optic circulator; 201, first electrically tunable polarization filter; 202, polarization filtering controller; 203, first photodetector; 301, first electrically tunable wavelength filter; 302, wavelength filtering controller; 303, second photodetector; 304, second electrically tunable wavelength filter; 401, erbium-doped fiber amplifier; 402, power controller; 403, third photodetector; 501, second electrically tunable polarization filter; 502, third electrically tunable wavelength filter; 503, fourth electrically tunable wavelength filter; 504, fourth photodetector; 505, integrated controller.

[0039] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0040] 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.

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0044] Referring to Figure 1 , Figure 1 is a functional block diagram of the first embodiment of the laser communication transceiver isolation device of the present invention. As Figure 1 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.

[0045] It should be noted that the system front end 10 can be used to transmit the signal light after preliminarily isolating the local light to the polarization filtering adaptive system 20. The polarization filtering adaptive system 20 can be used to identify the target polarization state of the signal light and transmit the first target light that conforms to the target polarization state to the wavelength filtering adaptive system 30. The wavelength filtering adaptive system 30 can be used to identify the target wavelength of the signal light and use the second target light that conforms to the target wavelength in the first target light as the target signal light after filtering and isolating from the local light.

[0046] It should be understood that the system front end can receive the signal light transmitted externally and input it into the system, or can emit the local light to the outside of the system. To prevent the local light from affecting the detection, reception, and processing of the signal light, the system front end can preliminarily isolate the local light and the signal light through the transmission optical path.

[0047] In a possible implementation manner, referring to Figure 2 , Figure 2This is a schematic diagram of the front end of the system in the first embodiment of the laser communication transceiver isolation device of the present invention. The front end 10 of the system can be a 3-port fiber optic circulator. The first end of the fiber optic circulator receives the local light 1, the second end of the fiber optic circulator receives the signal light 2, and the third end of the fiber optic circulator is connected to the first end of the polarization filtering adaptive system 20, that is, the local light enters the fiber optic circulator 101 from the first end, and the signal light enters the fiber optic circulator 101 from the second end. Among them, the characteristics of the 3-port fiber optic circulator 101 are: the laser incident from the first end only exits from the second end, and the laser incident from the second end only exits from the third end. Due to the three-port characteristics of the fiber optic circulator 101, the signal light 2 exits through the third end and enters the receiving system, while most of the local light 1 exits from the second end, initially achieving the isolation of the received and transmitted light beams. However, 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.

[0048] It should be noted that the polarization filtering adaptive system can monitor the power of polarized light according to the polarization angle of linearly polarized light, and then obtain the corresponding peak power according to the polarization states of the local light and the signal light. When the polarization states of the local light and the signal light are different, two peak powers will appear. Since the polarization state of the local light is known, the polarization state of the signal light (i.e., the target polarization state) can be distinguished. The polarization filtering adaptive system can only allow the polarization state of the signal light to pass through, so as to isolate the local light by distinguishing the polarization states. The first target light can be the light after the local light is isolated and filtered by the polarization state.

[0049] Furthermore, similar to the above polarization filtering adaptive system, the wavelength filtering adaptive system can cyclically scan the wavelengths of a specified band (the local light and the 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 (i.e., the target wavelength) can be distinguished. The wavelength filtering adaptive system can only allow the wavelength of the signal light to pass through, so as to isolate the local light by distinguishing the wavelengths. The second target light can be the light after the local light is isolated and filtered by the wavelength.

[0050] It should be understood that the wavelength filtering adaptive system can adaptively select the wavelength, that is, when the target light wavelength changes dynamically, such as the Doppler frequency shift problem that may occur during the transmission of the signal light, the wavelength filtering adaptive system will filter the changed wavelength, so as not to affect the subsequent reception and processing. Both the polarization filtering adaptive system and the wavelength filtering adaptive system can achieve adaptive adjustment filtering according to the dynamic changes of the target dimension eigenvalue, 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 reception and processing of the system.

[0051] In this embodiment, the laser communication transceiver isolation device includes: a system front end, a polarization filtering adaptive system, and a wavelength filtering adaptive system; a first end of the system front end receives local light, a second end of the system front end receives signal light, a third end of the system front end is connected to a first end of the polarization filtering adaptive system, and a second end of the polarization filtering adaptive system is connected to a first end of the wavelength filtering adaptive system. The system front end is configured to transmit the signal light after preliminarily isolating the local light to the polarization filtering adaptive system; the polarization filtering adaptive system is configured to identify the target polarization state of the signal light and transmit the first target light that conforms to the target polarization state to the wavelength filtering adaptive system; the wavelength filtering adaptive system is configured to identify the target wavelength of the signal light and use the second target light that conforms to the target wavelength in the first target light as the target signal light that is filtered and isolated from the local light. The optical signal selection of the local light is performed from two dimensions of polarization and wavelength respectively, so as to realize arbitrary optical wave matching, and the adaptive adjustment filtering is realized according to the dynamic change of the target dimension feature value, so as to realize the isolation of the signal light and the local light. At the same time, the polarization state and wavelength of the target light can be recorded, which is convenient for the subsequent system to receive and process.

[0052] Refer to Figure 3 , Figure 3 which is the functional module diagram of the second embodiment of the laser communication transceiver isolation device of the present invention. As Figure 3 shown, in this embodiment, the content that is the same as or similar to the above first embodiment can be referred to the above introduction and will not be repeated hereinafter. The laser communication transceiver isolation device further includes: a power control adaptive system 40; a second end of the wavelength filtering adaptive system 30 is connected to a first end of the power control adaptive system 40.

[0053] It should be noted that the wavelength filtering adaptive system 30 can also be configured to transmit the target signal light to the power control adaptive system 40; the power control adaptive system 40 can be configured to perform power gain regulation on the target signal light to obtain the target signal light with power matching.

[0054] It should be understood that the power control adaptive system 40 can perform power control on the signal light according to the signal processing requirements of the subsequent system to achieve automatic gain control and meet the requirements of power matching.

[0055] In a possible implementation manner, refer to Figure 4 , Figure 4 which is the structural schematic diagram of the second embodiment of the laser communication transceiver isolation device of the present invention. The polarization filtering adaptive system 20 includes: a first electrically tunable polarization filter 201, a polarization filtering controller 202, and a first photodetector 203.

[0056] Among them, the first end of the first electrically tunable polarization filter 201 is connected to the third end of the optical fiber circulator, the second end of the first electrically tunable 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 filtering controller 202, and the second end of the polarization filtering controller 202 is connected to the third end of the first electrically tunable polarization filter 201.

[0057] It should be noted that the first electrically tunable polarization filter 201 performs a cyclic scan according to the polarization angle (0° - 180°) of linearly polarized light. The first photodetector 203 monitors the power of the polarized light passing through the first electrically tunable polarization filter 201. When the polarization states of the local light and the signal light are different, two peak powers will appear in the first photodetector 203. 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 tunable polarization filter 201 is locked to the polarization state of the signal light through the polarization filtering controller 202, so that this component only allows the polarization state of the signal light to pass through. Thus, through the discrimination of the polarization state, the local light is isolated.

[0058] Furthermore, the wavelength filtering adaptive system 30 includes: a first electrically tunable wavelength filter 301, a wavelength filtering controller 302, and a second photodetector 303.

[0059] 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 filtering controller 302, and the second end of the wavelength filtering controller 302 is connected to the third end of the first electrically tunable wavelength filter 301.

[0060] It should be noted that the first electrically tunable wavelength filter 301 performs a cyclic scan on the wavelengths of a specified band. 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, two peak powers will appear in the first photodetector 203. Since the wavelength of the local light is a known quantity, the wavelength of the signal light can be obtained. At this time, the operating wavelength of the first electrically tunable wavelength filter 301 is locked to the wavelength of the signal light through the wavelength filtering controller 302, that is, only the signal light can pass through.

[0061] Further, the wavelength filtering adaptive system 30 further 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.

[0062] It should be understood that, compared with the first electrically tunable wavelength filter 301, the second electrically tunable wavelength filter 304 has a filtering performance with a narrower line width and can make a more refined selection of the target light. The operating wavelength of the second electrically tunable wavelength filter 304 is also locked to the target wavelength of the signal light. This filter can achieve a more refined selection of the target wavelength. At this time, most of the local light has been isolated and the signal light has been fully retained.

[0063] Further, the power control adaptive system 40 includes: an erbium-doped fiber amplifier 401, a power controller 402, and a third photodetector 403. Among them, a first end of the erbium-doped fiber amplifier 401 is connected to a second end of the first electrically tunable wavelength filter 301, a second end of the erbium-doped fiber amplifier 401 is connected to a first end of the power controller 402, a second end of the power controller 402 is connected to a first end of the power controller 402, and a second end of the power controller 402 is connected to a third end of the erbium-doped fiber amplifier 401.

[0064] It should be noted that the erbium-doped fiber amplifier 401 can amplify the signal light in terms of gain. At the same time, when subsequent signal processing requires power control of the signal light, this 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 regulates the gain coefficient of the erbium-doped fiber amplifier 401, so that automatic gain control can be achieved to meet the requirements of power matching.

[0065] It should be understood that, to further introduce the technical solution in detail, the working processes in different scenarios are specifically described. Since the polarization states and wavelengths of the local light and the signal light cannot be the same at the same time, three cases are discussed (the polarization state and wavelength of the local light are known quantities). Denote the polarization state of the local light as p1 and the wavelength as λ1; the polarization state of the signal light as p2 and the wavelength as λ2.

[0066] In the first possible scenario, p1 = p2 and λ1 ≠ λ2. When the polarization states of the local light and the signal light are the same but the wavelengths are different, after the two beams of light exit from the third port of the fiber optic circulator 101, the polarization filtering adaptive system 20 can only detect light of one polarization state. The filtering parameter of the first electrically tunable polarization filter 201 is fixed at p1, so the two beams of light enter the next stage without difference. During the scanning process of the first electrically tunable wavelength filter 301, two peak powers will appear in the second photodetector 303, corresponding to the local light and the signal light respectively. Since the wavelength of the local light is known, the center wavelengths of the two electrically tunable wavelength filters can be adjusted to the wavelength of the signal light through the wavelength filtering controller 302. After passing through the first electrically tunable wavelength filter 301, most of the local light is isolated. Subsequently, the erbium-doped fiber amplifier 401 amplifies the power of the signal light, and the second electrically tunable wavelength filter 304 further performs narrowband filtering on the signal light. In this way, the signal light enters the next receiving and processing system as the main beam.

[0067] In the second possible scenario, p1 ≠ p2 and λ1 = λ2. When the wavelengths of the local light and the signal light are the same but the polarization states are different, after the two beams of light pass through the fiber optic circulator 101 and enter the polarization filtering adaptive system 20, two peak powers will appear in 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 filtering controller 202 controls the first electrically tunable polarization filter 201 to lock onto the polarization state p2 of the target light (signal light). In this way, only the signal light can pass through the polarization filtering adaptive system 20, while the local light is isolated. After entering the wavelength filtering adaptive system 30, the main component of the light beam is the signal light, and there is only one target wavelength. Therefore, only one peak power appears in the second photodetector 303. The two wavelength tunable filters are adjusted to the target wavelength through the wavelength filtering controller 302 to filter the signal light. In this case, the wavelength filtering adaptive system 30 only retains the existence of the signal light wavelength and excludes the influence of other possible interfering lights.

[0068] In the third possible scenario, p1 ≠ p2 and λ1 ≠ λ2. When the polarization states and wavelengths of the local light and the signal light are different, according to the above description, the polarization filtering adaptive system 20 and the wavelength filtering adaptive system 30 respectively perform adaptive isolation on the local light from the two dimensions of polarization and wavelength, and the signal light is fully retained and amplified, giving full play to the two-dimensional isolation function of the entire system.

[0069] In this embodiment, the laser communication transceiver isolation device includes: an optical fiber circulator, a first electrically tunable polarization filter, a polarization filtering controller, a first photodetector, a first electrically tunable wavelength filter, a wavelength filtering controller, a second photodetector, and a second electrically tunable wavelength filter. The all-fiber coupling technology is adopted, which greatly reduces the energy loss of the optical signal during transmission and improves the overall efficiency of the system. At the same time, each regulation microsystem adopts closed-loop feedback control and has the ability of adaptive adjustment. This adaptability enables the isolation system to have strong robustness in complex environments. A power control module is also provided to perform automatic gain control on 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 optical wave matching. The system has the ability of active feature recognition, can dynamically sense the wavelength and polarization characteristics of the optical wave in two dimensions, realize the automatic control of the optical signal, and improve the response speed and processing ability of the system. At the same time, each functional module of this solution is relatively independent, there are more hardware devices, and the algorithm complexity is relatively low, which is easy to implement and suitable for general experimental scenarios.

[0070] Refer to Figure 5 , Figure 5 FIG. is a schematic structural diagram of the third embodiment of the laser communication transceiver isolation device of the present invention. Based on the above embodiments, the third embodiment of the laser communication transceiver isolation device of the present invention is proposed. In this embodiment, the same or similar content as in the above embodiments can be referred to the above introduction and will not be repeated hereinafter. As Figure 5 shown, the polarization filtering adaptive system 20 and the wavelength filtering adaptive system 30 are coupled to construct a dual filtering system. The dual filtering system includes: a second electrically tunable polarization filter 501, a third electrically tunable wavelength filter 502, a fourth electrically tunable wavelength filter 503, a fourth photodetector 504, and an integrated controller 505.

[0071] It should be noted that compared with the structure in the second embodiment of the above laser communication transceiver isolation device, one photodetector is removed in this embodiment, and only a fourth photodetector 504 is provided after the third electrically tunable wavelength filter 502. The polarization filtering controller 202, the wavelength filtering controller 302, and the power controller 402 are integrated into an integrated controller 505. The integrated controller 505 needs to perform coordinated control on the polarization and wavelength in two dimensions.

[0072] It should be understood that, similar to the second embodiment, the working processes in different scenarios are specifically described, and the polarization states and wavelengths of the local light and the signal light are discussed in three cases (the polarization state and wavelength of the local light are known quantities). Denote the polarization state of the local light as p1 and the wavelength as λ1; the polarization state of the signal light as p2 and the wavelength as λ2.

[0073] In the first possible case, p1 = p2 and λ1 ≠ λ2. When the polarization states of the local light and the signal light are the same but the wavelengths are different, since the polarization state of the local light is known, the polarization state of the second electrically tunable polarization filter 501 can be locked to p1, and both beams of light can pass through. During the scanning process of the third electrically tunable wavelength filter 502, in the wavelength dimension, the fourth photodetector 504 will have two peak powers, 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 operating wavelength of the third electrically tunable wavelength filter 502 to the wavelength of the signal light to achieve the filtering function. This case is similar to the second embodiment.

[0074] In the second possible case, p1 ≠ p2 and λ1 = λ2. When the wavelengths of the local light and the signal light are the same but the polarization states are different, since the wavelength of the local light is known, the operating wavelength of the third electrically tunable 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 both can pass through the third electrically tunable wavelength filter 502. In the polarization dimension, during the scanning process of the second electrically tunable polarization filter 501, the fourth photodetector 504 will have two peak powers, one is the local light and the other is 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 tunable polarization filter 501 to the signal light, thus achieving the filtering function. This case is similar to the second embodiment.

[0075] In the third possible case, p1 ≠ p2 and λ1 ≠ λ2. When the polarization states and wavelengths of the local light and the signal light are both different, first, the integrated controller sets the filtering step size of the third electrically tunable wavelength filter, that is, the operating wavelength of the third electrically tunable wavelength filter performs a cyclic scan in a specified band with a unit length step. At the same time, within each operating wavelength scan period of the third electrically tunable wavelength filter, the second electrically tunable polarization filter performs a cyclic scan, so that the filtering function in two dimensions can be achieved. During the collaborative cyclic scan of the second electrically tunable polarization filter and the third electrically tunable wavelength filter, only when the operating polarization states and wavelengths of the two filters are both the signal light or the local light at the same time, the fourth photodetector will have a peak power. Since the polarization state and wavelength of the local light are known, the integrated controller can lock the polarization state of the second electrically tunable polarization filter and the wavelength of the third electrically tunable wavelength filter to the signal light, thus achieving dual filtering of polarization and wavelength.

[0076] In this embodiment, the laser communication transceiver isolation device includes: a second electrically tunable polarization filter, a third electrically tunable wavelength filter, a fourth electrically tunable wavelength filter, a fourth photodetector, and an integrated controller. Through the adaptive control of wavelength, polarization, and power, arbitrary optical wave matching in three dimensions is achieved. It has a relatively high hardware integration level, and at the same time, the algorithm complexity is also relatively high, and it is suitable for scenarios with certain requirements for the volume, weight, and power consumption of hardware devices.

[0077] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

[0078] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.

[0079] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0080] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A laser communication transceiver isolation device, characterized in that, The laser communication transceiver isolation device includes: a system front end, a polarization filtering adaptive system, and a wavelength filtering 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 filtering adaptive system, and the second end of the polarization filtering adaptive system is connected to the first end of the wavelength filtering adaptive system; The system front end is used to transmit the signal light after initially isolating the local light to the polarization filtering adaptive system; The polarization filtering adaptive system is used to identify the target polarization state of the signal light and transmit the first target light that conforms to the target polarization state to the wavelength filtering adaptive system; The wavelength filtering adaptive system is used to identify the target wavelength of the signal light and use the second target light that conforms to the target wavelength in the first target light as the target signal light that is filtered and isolated from the local light; Among them, the polarization filtering adaptive system includes: a first electrically tunable polarization filter, a polarization filtering controller, and a first photodetector; The first photodetector performs power detection on the polarization angle of the signal light through cyclic scanning by the first electrically tunable polarization filter, determines the target polarization state of the signal light according to the peak power, and locks the first electrically tunable polarization filter to the target polarization state through the polarization filtering controller.

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 regulation on the target signal light to obtain a target signal light with power matching.

3. The laser communication transceiver isolation device according to claim 2, wherein, The system front end includes: an optical fiber circulator; The first end of the optical fiber circulator receives local light, the second end of the optical fiber circulator receives signal light, and the third end of the optical fiber 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 first end of the first electrically tunable polarization filter is connected to the third end of the optical fiber circulator, the second end of the first electrically tunable 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 filtering controller, and the second end of the polarization filtering controller is connected to the third end of the first electrically tunable polarization filter.

5. The laser communication transceiver isolation device according to claim 4, characterized in that, The wavelength filtering adaptive system includes: 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 filtering controller. The second end of the wavelength filtering 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, wherein, The power control adaptive system includes: 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. 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 includes: 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. The second end of the second electrically tunable wavelength filter is connected to the third end of the wavelength filtering controller.

8. The laser communication transceiver isolation device according to claim 7, wherein, The second photodetector is used to obtain the peak power of the 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 filtering adaptive system and the wavelength filtering adaptive system are coupled to construct a dual filtering system; The dual filtering system includes: a second electrically tunable polarization filter, a third electrically tunable wavelength filter, a fourth electrically tunable wavelength filter, a fourth photodetector, and an integrated controller; The first end of the second electrically tunable polarization filter is connected to the first end of the front end of the system. The first end of the second electrically tunable polarization filter is connected to the first end of the third electrically tunable wavelength filter. The second end of the third electrically tunable 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 tunable wavelength filter. The second end of the fourth photodetector is connected to the first end of the integrated controller. The integrated controller is also respectively connected to the second electrically tunable polarization filter, the third electrically tunable wavelength filter, the fourth electrically tunable 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 the light passing through the second electrically tunable polarization filter and the third electrically tunable wavelength filter and obtain the target polarization state and target wavelength of the signal light.

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