Laser communication device, method and system

Abstract

The invention discloses a laser communication device, method and system, and relates to the technical field of laser communication, and the device comprises a spatial light path adjustment module, a phase adjustment module, a photoelectric conversion module and a controller. Multiple paths of light beams transmitted from the outside are transmitted to the photoelectric conversion module through the phase adjustment module by the spatial light path adjustment module, and then the photoelectric conversion module converts the multiple paths of light beams into communication signals and transmits the communication signals to the communication receiving plate, so that optical communication is completed. Wherein the controller collects light spot information and phase information of the multiple paths of light beams through the spatial light path adjusting module and the phase adjusting module, controls the controller to adjust the transmission angle of each path of light beam according to the light spot information, and controls the controller to adjust the phase of each path of light beam according to the phase information; the phases of the light beams received by the photoelectric conversion module are kept highly consistent, so that the power of communication signals obtained by photoelectric conversion of the photoelectric conversion module is higher, and the communication quality of laser communication is improved.

Description

Technical Field

[0001] The present application relates to the field of laser communication technology, and in particular to a laser communication device, method and system. Background Art

[0002] In existing technologies, atmospheric turbulence is an important factor affecting signal quality and communication performance in Earth-satellite laser communications. Multi-aperture diversity reception can be used to encode and fuse multiple optical signals to improve the signal-to-noise ratio and reliability to cope with atmospheric turbulence interference. However, the multiple optical signals received by multi-aperture diversity reception may be out of sync due to different environmental interference, which will also lead to poor signal reception quality and unstable laser communication. Summary of the invention

[0003] The main purpose of the present application is to provide a laser communication device, method and system, aiming to solve the technical problem of how to improve the signal reception quality of multi-channel laser communication.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application provides a laser communication device, the laser communication device comprising: A spatial optical path adjustment module, used to transmit multiple light beams transmitted externally to the phase adjustment module via multiple optical paths, and to adjust the transmission angle of each light beam based on an optical path adjustment signal sent by the controller; The phase adjustment module is used to adjust the phase of each light beam after adjusting the transmission angle based on the phase adjustment signal sent by the controller, and transmit it to the photoelectric conversion module; The photoelectric conversion module is electrically connected to the communication receiving board, and is used to convert each light beam after adjusting the phase into a communication signal, and send the communication signal to the communication receiving board; The controller is electrically connected to the spatial optical path adjustment module and the phase adjustment module, respectively, and is used to collect the spot information corresponding to each light beam through the spatial optical path adjustment module, and send the corresponding optical path adjustment signal to the spatial optical path adjustment module based on the spot information, and to collect the phase information corresponding to each light beam through the phase adjustment module, and send the corresponding phase adjustment signal to the phase adjustment module based on the phase information.

[0005] In one embodiment, the phase adjustment module includes: a phase detection unit, a plurality of first beam splitters, a plurality of spatial optical couplers, and a plurality of phase shifters; The phase detection unit is electrically connected to the controller, and each of the phase shifters is electrically connected to the controller respectively; In each optical path, a spatial optical coupler, a first beam splitter and a phase shifter are provided, and the first beam splitter is connected to the spatial optical coupler, the phase detection unit and the phase shifter respectively through an optical signal line; Each of the spatial optical couplers is used to convert each light beam from spatial light to dielectric light, and transmit the light beam to each of the first beam splitters through an optical signal line; Each of the first beam splitters is used to split each light beam and transmit the light beams to the phase detection unit and each of the phase shifters respectively; The phase detection unit is used to collect the phase information corresponding to each light beam emitted by each first beam splitter, and send it to the controller; Each of the phase shifters is used to adjust the phase of each light beam using the phase adjustment signal sent by the controller and send the phase to the photoelectric conversion module.

[0006] In one embodiment, the photoelectric conversion module includes: a dielectric optical coupler and a photodetector; Each input end of the dielectric optical coupler is connected to the phase adjustment module through an optical signal line, the output end of the dielectric optical coupler is connected to the input end of the photodetector through an optical signal line, and the output end of the photodetector is electrically connected to the communication receiving board; The dielectric optical coupler is used to couple the light beams into a single light beam and transmit the single light beam to the photoelectric detector; The photoelectric detector is used to convert the single-path light beam into the communication signal and send the communication signal to the communication receiving board.

[0007] In one embodiment, the spatial optical path adjustment module includes: a plurality of galvanometers, a plurality of first beam splitters, and a plurality of CCDs; Each of the galvanometers is electrically connected to the controller, and each of the CCDs is electrically connected to the controller; In each optical path, there is one galvanometer and one first beam splitter, and the first beam splitter is equipped with one CCD; Each of the galvanometers is used to adjust the transmission angle of each light beam based on the light path adjustment signal sent by the controller and transmit the light beam to each of the first beam splitters; Each of the first beam splitters is used to split each light beam emitted by each of the galvanometers, and emit the light beams to each of the CCDs and the phase adjustment module respectively; Each CCD is used to collect the light spot information corresponding to each light beam and transmit the light spot information to the controller.

[0008] In one embodiment, the laser communication device further comprises: a correction module; The correction module is arranged on the optical path between the spatial optical path adjustment module and the phase adjustment module, and the correction module is electrically connected to the controller; The correction module is used to collect the distortion information corresponding to each light beam after adjusting the transmission angle, and send the distortion information to the controller; The controller is further used to control the correction module to correct the wavefront of each light beam based on the distortion information and transmit the corrected light beams to the phase adjustment module.

[0009] In one embodiment, the correction module includes: a plurality of second beam splitters, a plurality of Hartmann sensors, and a plurality of deformable mirrors; Each of the Hardman sensors is electrically connected to the controller, and each of the deformable mirrors is electrically connected to the controller; In each optical path, one of the second beam splitter and one of the deformable mirrors is provided, and the second beam splitter is provided with one of the Hartmann sensors; Each of the second beam splitters is used to split each light beam after adjusting the transmission angle, and transmit the light beams to each of the Hardman sensors and each of the deformable mirrors respectively; Each of the Hartmann sensors is used to collect the distortion information corresponding to each light beam and transmit the distortion information to the controller; The controller is further used to control each of the deformable mirrors to correct the light surface corresponding to each light beam transmitted by each of the second beam splitters based on the distortion information.

[0010] In one embodiment, the laser communication device further includes: a transmitting module; The transmitting module is arranged on the optical path between the spatial optical path adjustment module and the phase adjustment module, and the transmitting module is also connected to the communication transmitting board through an optical signal line; The transmitting module is used to convert the single-channel medium light emitted by the communication transmitting board into multiple-channel spatial light, and transmit each channel of spatial light to the spatial light path adjustment module via multiple light paths; The spatial optical path adjustment module is further used to adjust the transmission angle of each path of spatial light based on the optical path adjustment signal, and transmit the adjusted each path of spatial light to an external target communication device.

[0011] In one embodiment, the transmitting module includes: a second beam splitter, an EDFA, a plurality of collimating mirrors, and a plurality of third beam splitters; In each optical path, there is one third beam splitter, and one collimator is configured for the third beam splitter; The second beam splitter has a plurality of output ends, each output end is connected to a corresponding collimator through an optical signal line, the input end of the second beam splitter is connected to the output end of the EDFA through an optical signal line, and the input end of the EDFA is connected to the communication transmitting board through an optical signal line; The EDFA is used to amplify the power of the single-channel dielectric light emitted by the communication transmitting board and transmit it to the second beam splitter; The second beam splitter is used to split the single-path medium light after power amplification to obtain multiple-path medium light, and send them to each of the collimating lenses respectively; Each of the collimating mirrors is used to convert each of the split medium lights into parallel multi-path spatial lights, and transmit them to each of the third beam splitters respectively; Each of the third beam splitters is used to transmit multi-path spatial light to the spatial light path adjustment module.

[0012] In addition, to achieve the above-mentioned purpose, the present application also proposes a laser communication method, which is applied to the laser communication device as described above, and the steps of the laser communication method include: The spatial optical path adjustment module collects the spot information of the multiple light beams transmitted externally, and adjusts the transmission angle of each light beam based on the spot information; The phase adjustment module collects the phase information of each light beam after adjusting the transmission angle, and adjusts the phase of each light beam based on the phase information; Through the photoelectric conversion module, each light beam after phase adjustment is converted into a communication signal, and the communication signal is sent to the communication receiving board.

[0013] In addition, to achieve the above-mentioned purpose, the present application also provides a laser communication system, which adopts the laser communication device as described above.

[0014] The embodiments of the present application provide a laser communication device, method and system, wherein the laser communication device includes: a spatial optical path adjustment module, which is used to transmit multiple light beams transmitted externally to a phase adjustment module in multiple optical paths, and adjust the transmission angle of each light beam based on an optical path adjustment signal sent by a controller; the phase adjustment module, which is used to adjust the phase of each light beam after adjusting the transmission angle based on the phase adjustment signal sent by the controller, and transmit it to a photoelectric conversion module; the photoelectric conversion module is electrically connected to a communication receiving board, and is used to convert each light beam after the phase is adjusted into a communication signal, and send the communication signal to the communication receiving board; the controller is electrically connected to the spatial optical path adjustment module and the phase adjustment module, respectively, and is used to collect light spot information corresponding to each light beam through the spatial optical path adjustment module, and send the corresponding light path adjustment signal to the spatial optical path adjustment module based on the light spot information, and collect phase information corresponding to each light beam through the phase adjustment module, and send the corresponding phase adjustment signal to the phase adjustment module based on the phase information.

[0015] The spatial optical path adjustment module transmits the multiple light beams transmitted externally to the photoelectric conversion module through multiple optical paths through the phase adjustment module, and then the photoelectric conversion module converts the multiple light beams into electrical signals and transmits them to the communication receiving board, thereby completing optical communication. In this process, the controller can collect the spot information of the multiple light beams through the spatial optical path adjustment module, and control it to adjust the transmission angle of each light beam according to the spot information, so that the transmission direction of each light beam input to the phase adjustment module remains consistent. The controller can also collect the phase information of each light beam through the phase adjustment module, and control it to adjust the phase of each light beam according to the phase information, so that the phase of each light beam received by the photoelectric conversion module is also consistent. Since the phases of the various light beams received by the photoelectric conversion module are highly consistent, the power of the communication signal obtained by the photoelectric conversion module through photoelectric conversion is greater, which improves the communication quality of laser communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of the structure of the laser communication device embodiment 1 of the present application; Figure 2 A schematic diagram of the structure of the laser communication device embodiment 2 of the present application; Figure 3 A flowchart diagram of the first embodiment of the laser communication method of the present application is provided.

[0019] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0021] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0022] This application proposes a laser communication device of the first embodiment, please refer to Figure 1 , the laser communication device comprises: The spatial optical path adjustment module 10 is used to transmit the multiple optical beams transmitted externally to the phase adjustment module 20 in multiple optical paths, and adjust the transmission angle of each optical beam based on the optical path adjustment signal sent by the controller 40; The phase adjustment module 20 is used to adjust the phase of each light beam after adjusting the transmission angle based on the phase adjustment signal sent by the controller 40, and transmit it to the photoelectric conversion module 30; The photoelectric conversion module 30 is electrically connected to the communication receiving board 50, and is used to convert each light beam after adjusting the phase into a communication signal, and send the communication signal to the communication receiving board 50; The controller 40 is electrically connected to the spatial optical path adjustment module 10 and the phase adjustment module 20, respectively, and is used to collect the spot information corresponding to each light beam through the spatial optical path adjustment module 10, and send the corresponding optical path adjustment signal to the spatial optical path adjustment module 10 based on the spot information, and to collect the phase information corresponding to each light beam through the phase adjustment module 20, and send the corresponding phase adjustment signal to the phase adjustment module 20 based on the phase information.

[0023] It should be understood that the “light”, “light beam”, “optical signal” and the like mentioned above and below may refer to one or more lasers having communication information.

[0024] It should be noted that, in this embodiment, the multi-channel light beams transmitted externally can be multi-channel lasers for laser communication emitted by a laser communication device or equipment at a very far distance. As a scenario, for example, in a ground-to-satellite communication scenario, the laser communication device proposed in this embodiment can be used as a laser communication device used for communication between a ground station or both ends of a satellite. The ground station obtains information such as the position, attitude, orbit, etc. of the satellite, and uses a high-precision positioning system and a pointing control system, combined with orbit prediction information, to point the laser communication device in the direction of the satellite and emit lasers. The laser communication device on the satellite can search according to the approximate location of the ground station and the coverage of the communication link, and try to receive the laser emitted by the ground station. When the satellite captures the laser emitted by the ground station, it begins to keep staring at the satellite, and can scan and search for the laser signal subsequently emitted by the satellite according to the preset working mode. The laser signal can be understood as the multi-channel laser received by the laser communication device of this embodiment.

[0025] In a specific implementation, the spatial optical path adjustment module 10 may first receive the multi-path light beams transmitted from the outside, and transmit them to the phase adjustment module 20, and then the phase adjustment module 20 may transmit the received multi-path light beams to the photoelectric conversion module 30, and the photoelectric conversion module 30 may convert the multi-path light beams into a communication signal in the form of a single-path electrical signal, and transmit it to the communication receiving board 50, so as to complete the process of receiving communication information. The communication receiving board 50 refers to an electronic device that can receive electrical signals in various forms such as analog signals, digital signals, and pulse signals, and it can also convert, amplify, demodulate, and process the received electrical signals through internal circuits and processors, and finally convert the electrical signals into useful information that can be recognized by the device or system.

[0026] It should be understood that the spot information refers to the distribution of the corresponding light beam in space, and its specific parameters include the spot shape (such as circular, elliptical), spot size (i.e., the area of ​​the spot on a certain cross section), spot brightness distribution (i.e., the relative distribution of light intensity at each point in the spot, generally Gaussian distribution, with the strongest light intensity at the center and gradually weakening toward the edge), etc. The spot information can be used to obtain the transmission angle of the corresponding light beam in space (i.e., the three-dimensional spatial angle in the three-dimensional coordinate system). Phase information refers to the phase angle of the light beam at the corresponding moment, which is used to describe the position of the light wave when it vibrates. After coupling and superimposing light waves of the same phase, their actual output power will be superimposed, while after coupling and superimposing light waves of different phases, their output power cannot reach the ideal superimposed power, and may even be significantly reduced.

[0027] It should be noted that, in the present embodiment, the multiple optical paths formed by each light beam sequentially pass through the spatial optical path adjustment module 10, the phase adjustment module 20 and the photoelectric conversion module 30. In each of the above optical paths, the spatial optical path adjustment module 10 can also collect the spot information of each light beam in each optical path, and transmit the spot information of each light beam to the controller 40. At the same time, the phase adjustment module 20 can also collect the phase information of each light beam in the optical path, and transmit the phase information of each light beam to the controller 40. The controller 40 can determine the corresponding transmission angle of each light beam in three-dimensional space through the received spot information, and send the corresponding optical path adjustment signal to the spatial optical path adjustment module 10, so that the spatial optical path adjustment module 10 can adjust the transmission angle of each light beam according to the optical path adjustment signal, and finally send each light beam to the phase adjustment module 20 at the same transmission angle. The controller 40 can also determine the phase of each light beam at the corresponding moment through the received phase information, and send the corresponding phase adjustment signal to the phase adjustment module 20, so that the phase adjustment module 20 can adjust the phase of each light beam according to the phase adjustment signal, and finally send each light beam to the photoelectric conversion module 30 with the same phase. The photoelectric conversion module 30 can couple and superimpose multiple light beams with consistent phases, and convert them from the form of optical signals to the form of electrical signals to obtain high-power communication signals, and transmit the communication signals to the communication receiving board 50, finally realizing high-quality laser communication.

[0028] In the above communication process, since the spatial optical path adjustment module 10 can adjust the spatial transmission angle of each light beam to be consistent and then transmit it to the phase adjustment module 20, it can prevent the loss of optical signals or the inability of the subsequent stage to receive optical signals due to the large divergence angle of multiple light beams, and can improve the accuracy and stability of optical signal transmission, and ensure the working accuracy of the phase adjustment module 20. The phase adjustment module 20 can also adjust the phases of multiple light beams with consistent spatial transmission angles to be consistent, so that when the photoelectric conversion module 30 couples and superimposes the various light beams, the energy loss of the coupled single light beam obtained is minimized, and high-efficiency photoelectric conversion can be guaranteed, thereby obtaining high-quality, high-power communication signals and transmitting them to the signal receiving board, thereby achieving high-quality communication signal reception.

[0029] An embodiment of the present application provides a laser communication device, which includes: a spatial optical path adjustment module, which is used to transmit multiple light beams transmitted externally to a phase adjustment module in multiple optical paths, and adjust the transmission angle of each light beam based on an optical path adjustment signal sent by a controller; the phase adjustment module, which is used to adjust the phase of each light beam after adjusting the transmission angle based on the phase adjustment signal sent by the controller, and transmit it to a photoelectric conversion module; the photoelectric conversion module is electrically connected to a communication receiving board, and is used to convert each light beam after the phase is adjusted into a communication signal, and send the communication signal to the communication receiving board; the controller is electrically connected to the spatial optical path adjustment module and the phase adjustment module, respectively, and is used to collect the spot information corresponding to each light beam through the spatial optical path adjustment module, and send the corresponding optical path adjustment signal to the spatial optical path adjustment module based on the spot information, and collect the phase information corresponding to each light beam through the phase adjustment module, and send the corresponding phase adjustment signal to the phase adjustment module based on the phase information. The spatial optical path adjustment module transmits the multiple light beams transmitted externally to the photoelectric conversion module through multiple optical paths through the phase adjustment module, and then the photoelectric conversion module converts the multiple light beams into electrical signals and transmits them to the communication receiving board, thereby completing optical communication. In this process, the controller can collect the spot information of the multiple light beams through the spatial optical path adjustment module, and control it to adjust the transmission angle of each light beam according to the spot information, so that the transmission direction of each light beam input to the phase adjustment module remains consistent. The controller can also collect the phase information of each light beam through the phase adjustment module, and control it to adjust the phase of each light beam according to the phase information, so that the phase of each light beam received by the photoelectric conversion module is also consistent. Since the phases of the various light beams received by the photoelectric conversion module are highly consistent, the power of the communication signal obtained by the photoelectric conversion module through photoelectric conversion is greater, which improves the communication quality of laser communication.

[0030] Based on the first embodiment of the laser communication device of the present application, in the second embodiment of the laser communication device of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 2 , the phase adjustment module 20 includes: a phase detection unit 21, a plurality of first beam splitters 22, a plurality of spatial optical couplers 23 and a plurality of phase shifters 24; The phase detection unit 21 is electrically connected to the controller 40, and each of the phase shifters 24 is electrically connected to the controller 40 respectively; In each optical path, there is a spatial optical coupler 23, a first beam splitter 22 and a phase shifter 24, and the first beam splitter 22 is connected to the spatial optical coupler 23, the phase detection unit 21 and the phase shifter 24 through optical signal lines respectively; Each of the spatial optical couplers 23 is used to convert each light beam from spatial light to dielectric light, and transmit the light beam to each of the first beam splitters 22 through an optical signal line; Each of the first beam splitters 22 is used to split each light beam and transmit the light beams to the phase detection unit 21 and each of the phase shifters 24 respectively; The phase detection unit 21 is used to collect the phase information corresponding to each light beam emitted by each first beam splitter 22, and send it to the controller 40; Each of the phase shifters 24 is used to adjust the phase of each light beam using the phase adjustment signal sent by the controller 40 and send the phase to the photoelectric conversion module 30 .

[0031] It should be noted that the optical signal line can be an optical fiber, and the optical beam can be transmitted through the optical fiber as a medium. The phase detection unit 21 is an electronic device that can detect the phase of the light beam. In this embodiment, the above-mentioned multi-path light beam can pass through the phase adjustment module 20 in multiple optical paths. In each optical path passing through the phase adjustment module 20, a spatial optical coupler 23, a first beam splitter 22 and a phase shifter 24 can be arranged in sequence. Each first beam splitter 22 can be connected to a corresponding spatial optical coupler 23, a phase shifter 24 and a phase detection unit 21 through an optical signal line, and each phase shifter 24 is also connected to multiple input ends of the photoelectric conversion module 30 through an optical signal line.

[0032] Among them, the spatial optical coupler 23 can convert the spatial light into dielectric light, that is, convert one of the light beams transmitted in the air into a light beam transmitted in the optical signal line, and transmit it to the corresponding first beam splitter 22 through the medium provided by the optical signal line. Each first beam splitter 22 can split the received dielectric light beam into two dielectric lights with different wavelengths. For ease of understanding, the first wavelength dielectric light and the second wavelength dielectric light are used for explanation below. The first wavelength dielectric light is used for phase detection, and the second wavelength dielectric light is used to achieve optical communication. The first beam splitter 22 can transmit the first wavelength dielectric light obtained by beam splitting to the phase detection unit 21, and at the same time transmit the second wavelength dielectric light obtained by beam splitting to the phase shifter 24. The phase detection unit 21 can detect the phase characteristics of each received first wavelength medium light, and transmit the corresponding phase information to the controller 40, so that the controller 40 can send the corresponding phase adjustment signal to each corresponding phase shifter 24 in each optical path based on the phase information of each first wavelength medium light for control, so that each phase shifter 24 adjusts the phase of each second wavelength medium light beam respectively, thereby ensuring that the phase of each light beam emitted to the photoelectric conversion module 30 through each phase shifter 24 remains consistent. Therefore, in the present application, the multi-path light beams injected into the phase adjustment module 20 are not exactly the same as the multi-path light beams emitted from the phase adjustment module 20, and there will be a certain amount of energy loss.

[0033] Further, in this embodiment, the photoelectric conversion module 30 includes: a dielectric optical coupler 31 and a photodetector 32; Each input end of the dielectric optical coupler 31 is connected to the phase adjustment module 20 through an optical signal line, and the output end of the dielectric optical coupler 31 is connected to the input end of the photodetector 32 through an optical signal line, and the output end of the photodetector 32 is electrically connected to the communication receiving board 50; The dielectric optical coupler 31 is used to couple the light beams into a single light beam, and transmit the single light beam to the photodetector 32; The photoelectric detector 32 is used to convert the single-path light beam into the communication signal and send the communication signal to the communication receiving board 50 .

[0034] It should be noted that, in this embodiment, the dielectric optical coupler 31 is an optical device that can couple multiple light beams transmitted in multiple optical signal lines (medium) into a single light beam, and can also output the single light beam through another optical signal line. The photodetector 32 is an electronic device that can detect laser light, convert the laser light into an electrical signal and output it, and the power of the output electrical signal is proportional to the power of the input optical signal.

[0035] It is easy to understand that in this embodiment, the dielectric optical coupler 31 has multiple input ends, each of which can be connected to one of the phase shifters 24 of the phase adjustment module 20 described above through an optical signal line, so that multiple light beams with consistent phase adjustment can be received simultaneously, and multiple light beams with consistent phases can be coupled and superimposed into a single light beam, and the single light beam is emitted to the photodetector 32. The photodetector 32 can convert the coupled single light beam into a corresponding electrical signal, that is, a communication signal, and send the communication signal to the communication receiving board 50, thereby completing the receiving process of laser communication.

[0036] Furthermore, in this embodiment, the spatial optical path adjustment module 10 includes: a plurality of galvanometer mirrors 11, a plurality of first beam splitters 12, and a plurality of CCDs 13; Each of the galvanometers 11 is electrically connected to the controller 40, and each of the CCDs 13 is electrically connected to the controller 40; In each optical path, there is one galvanometer mirror 11 and one first beam splitter 12, and the first beam splitter 12 is equipped with one CCD 13; Each of the galvanometers 11 is used to adjust the transmission angle of each light beam based on the light path adjustment signal sent by the controller 40 and transmit the light beam to each of the first beam splitters 12; Each of the first beam splitters 12 is used to split each light beam emitted by each of the galvanometer mirrors 11, and emit the light beams to each of the CCDs 13 and the phase adjustment module 20 respectively; Each CCD 13 is used to collect the light spot information corresponding to each light beam and transmit the light spot information to the controller 40 .

[0037] It should be noted that, in this embodiment, the galvanometer 11 is an optical device that can use an electrical signal to drive the deflection angle of the light beam. The first beam splitter 12 can be an energy beam splitter, which can divide the energy of the light beam into transmitted light and reflected light according to a preset ratio, which can be achieved through optical structure design and coating technology. CCD is a semiconductor optoelectronic device, the full name of which is Charge-Coupled Device, which can convert optical images into digital electrical signals and transmit them.

[0038] It is easy to understand that in this embodiment, in each optical path, a galvanometer 11 and a first beam splitter 12 are configured, and each first beam splitter 12 is also configured with a CCD13. The light beam can continue to be transmitted to the first beam splitter 12 behind through the galvanometer 11. The first beam splitter 12 reflects the light beam with a small part of the energy to the CCD13, and transmits the light beam with most of the energy and continues to output, that is, it is emitted to the phase adjustment module 20. Among them, the reflected light beam will form a light spot on the CCD13, and the CCD13 can generate corresponding light spot information based on the image of the light spot, and transmit the light spot information to the controller 40. The controller 40 can generate a corresponding light path adjustment signal based on the light spot information of each light beam, and transmit the light path adjustment signal to the corresponding galvanometer 11, so that the corresponding galvanometer 11 adjusts the transmission angle of the light beam on the optical path, and finally adjusts the transmission angle of each light beam (each transmitted light beam) on each light path to be consistent before emitting to the phase adjustment module 20, so that the phase adjustment module 20 works more accurately. Therefore, in the present application, the multiple light beams injected into the spatial light path adjustment module 10 and the multiple light beams emitted from the spatial light path adjustment module 10 are not completely the same, and there will be a certain amount of energy loss.

[0039] Furthermore, in this embodiment, the laser communication device further includes: a correction module 60; The correction module 60 is disposed on the optical path between the spatial optical path adjustment module 10 and the phase adjustment module 20, and the correction module 60 is electrically connected to the controller 40; The correction module 60 is used to collect the distortion information corresponding to each light beam after adjusting the transmission angle, and send the distortion information to the controller 40; The controller 40 is further configured to control the correction module 60 to correct the wavefront of each light beam based on the distortion information and transmit the corrected light beams to the phase adjustment module 20 .

[0040] It should be noted that the distortion information can be understood as relevant information corresponding to the non-ideal state of the wavefront shape (or wavefront shape) and phase distribution of the light beam.

[0041] It is easy to understand that in this embodiment, a correction module 60 can also be provided in each optical path between the spatial optical path adjustment module 10 and the phase adjustment module 20. The correction module 60 can receive each light beam emitted by the spatial optical path adjustment module 10 after adjusting the transmission angle, and emit each light beam to the phase adjustment module 20. In this process, the correction module 60 can also collect the distortion information of each light beam and transmit it to the controller 40, so that the controller 40 can determine the light wave distortion caused to the light beam by optical devices such as the first beam splitter 12. The controller 40 can also send a corresponding distortion correction signal to the correction module 60 based on the distortion information received from each light beam, so that the correction module 60 performs wavefront (wave surface) correction on each light beam, reduces the wavefront (wave surface) distortion of the light beam, ensures the authenticity of the wavefront (wave surface) of the light beam, and improves the quality of the light beam.

[0042] Further, in this embodiment, the correction module 60 includes: a plurality of second beam splitters 61, a plurality of Hartmann sensors 62 and a plurality of deformable mirrors 63; Each of the Hardman sensors 62 is electrically connected to the controller 40, and each of the deformable mirrors 63 is electrically connected to the controller 40; In each optical path, there is a second beam splitter 61 and a deformable mirror 63, and the second beam splitter 61 is equipped with a Hartmann sensor 62; Each of the second beam splitters 61 is used to split each light beam after adjusting the transmission angle, and transmit the light beams to each of the Hartmann sensors 62 and each of the deformable mirrors 63 respectively; Each of the Hartmann sensors 62 is used to collect the distortion information corresponding to each light beam and transmit the distortion information to the controller 40; The controller 40 is further configured to control each of the deformable mirrors 63 to correct the light surface corresponding to each of the light beams transmitted by each of the second beam splitters 61 based on the distortion information.

[0043] It should be noted that, in this embodiment, the Hartmann sensor 62 is a sensor for measuring the surface error of optical elements such as lenses and prisms. The deformable mirror 63 is an optical element for changing the optical path of the light wave front transmission or the refractive index of the transmission medium to change the phase structure of the incident light beam wave front, thereby correcting the light wave wave front phase.

[0044] It is easy to understand that the second beam splitter 61 is similar to the first beam splitter 12 and can also be an energy beam splitter, and the specific working principle is not repeated. In this embodiment, a second beam splitter 61 and a deformable mirror 63 can be set in each optical path, and the second beam splitter 61 is also correspondingly configured with a Hartmann sensor 62. When the second beam splitter 61 receives a light beam, it can split the light beam into a reflected light beam and a transmitted light beam, and emit the reflected light beam to the corresponding Hartmann sensor 62, and emit the transmitted light beam to the corresponding deformable mirror 63. When receiving the reflected light beam, the Hardman sensor 62 can detect the optical distortion of the original light beam caused by passing through a series of optical elements such as the second beam splitter 61, generate corresponding distortion information, and transmit the distortion information to the controller 40. The controller 40 can send corresponding distortion correction signals to each deformable mirror 63 on each optical path based on the distortion information corresponding to each light beam. Each deformable mirror 63 can perform wavefront (wavefront) correction on its corresponding transmitted light beam based on its corresponding distortion correction signal, and emit each light beam after the wavefront (wavefront) correction to the phase adjustment module 20.

[0045] Furthermore, in this embodiment, the laser communication device further includes: a transmitting module 70; The transmitting module 70 is disposed on the optical path between the spatial optical path adjustment module 10 and the phase adjustment module 20, and the transmitting module 70 is also connected to the communication transmitting board 80 via an optical signal line; The transmitting module 70 is used to convert the single-channel medium light emitted by the communication transmitting board 80 into multiple-channel spatial light, and transmit each channel of spatial light to the spatial light path adjustment module 10 via multiple light paths; The spatial optical path adjustment module 10 is further used to adjust the transmission angle of each path of spatial light based on the optical path adjustment signal, and transmit the adjusted each path of spatial light to an external target communication device 90 .

[0046] It should be noted that, in this embodiment, the laser communication device can also send multiple light beams to the external target communication device 90 to realize the transmission process of laser communication. The target communication device 90 can be a communication device or device capable of receiving a laser beam or a laser signal, and its structure can be the same as the laser communication device proposed in this embodiment.

[0047] It is easy to understand that the communication transmitting board 80 is a device that can convert electronic signals into electromagnetic waves and radiate them. It can output a corresponding single-channel light beam based on the received electrical signal, and the power of the electrical signal is proportional to the power of the light beam. In this embodiment, the transmitting module 70 can be connected to the communication transmitting board 80 through an optical signal line. The communication transmitting board 80 can transmit a single-channel medium light converted from the electrical signal to the transmitting module 70. The transmitting module 70 can convert the single-channel medium light into multiple-channel spatial light and transmit it to the spatial light path adjustment module 10 through multiple optical paths. The spatial light path adjustment module 10 can receive each channel of spatial light transmitted from the transmitting module 70, and transmit each channel of spatial light to the external target communication device 90. Among them, the spatial light path adjustment module 10 can also adjust the transmission angle of each channel of spatial light based on the optical path adjustment signal, and transmit each channel of spatial light with the same adjusted transmission angle.

[0048] It is worth noting that in the present embodiment, the laser communication process includes the laser emission and the laser reception process, which are in opposite directions. The multiple optical paths corresponding to the various spatial lights emitted by the transmitting module 70 overlap with the multiple optical paths emitted from the spatial optical path adjustment module 10 to the phase adjustment module 20 as described above, and the light beam transmission direction is opposite.

[0049] Further, in this embodiment, the transmitting module 70 includes: a second beam splitter 72, an EDFA 71, a plurality of collimating mirrors 73 and a plurality of third beam splitters 74; In each optical path, there is one third beam splitter 74, and one collimator 73 is configured for the third beam splitter 74; The second beam splitter 72 has a plurality of output ends, each of which is connected to a corresponding collimator 73 via an optical signal line, the input end of the second beam splitter 72 is connected to the output end of the EDFA 71 via an optical signal line, and the input end of the EDFA 71 is connected to the communication transmitting board 80 via an optical signal line; The EDFA 71 is used to amplify the power of the single-channel medium light emitted by the communication transmitting board 80 and transmit it to the second beam splitter 72; The second beam splitter 72 is used to split the single-path medium light after power amplification to obtain multiple-path medium light, and send them to each of the collimating lenses 73 respectively; Each of the collimating lenses 73 is used to convert each of the split medium lights into parallel multi-path spatial lights, and transmit them to each of the third beam splitters 74 respectively; Each of the third beam splitters 74 is used to transmit multi-path spatial lights to the spatial light path adjustment module 10 .

[0050] It should be noted that, in this embodiment, the second beam splitter 72 is a single-input multi-output beam splitter, which can split a single light beam into multiple light beams. The full name of EDFA in English is Erbium-Doped Fiber Amplifier, which is an erbium-doped fiber amplifier, which is used to amplify the power of the optical signal by doping the rare earth element erbium, thereby reducing the attenuation of the light beam during transmission in the optical signal line. The collimator 73 is an optical element for converting a light beam into parallel light or quasi-parallel light. The third beam splitter 74 can be a wavelength beam splitter, which can reflect a light beam of a certain wavelength and transmit a light beam of another wavelength, thereby changing the transmission direction of the light beam in space.

[0051] It is easy to understand that in this embodiment, the communication transmitting board 80 first sends a single-channel dielectric light to the EDFA 71 through the optical signal line, and the EDFA 71 amplifies the power of the single-channel dielectric light and transmits it to the second beam splitter 72. The second beam splitter 72 can split the single-channel dielectric light to obtain multiple channels of dielectric light, and transmit them to each collimator 73 through the multiple channels of optical signal lines, and then each collimator 73 converts each channel of dielectric light into parallel multiple channels of spatial light and transmits them to the third beam splitter 74 corresponding to each optical path. In this embodiment, the third beam splitter 74 only reflects the multiple channels of spatial light of a specific wavelength, so that each channel of spatial light enters the multiple optical paths described above and is respectively transmitted to the spatial optical path adjustment module 10.

[0052] It is worth noting that the wavelength of the multi-path spatial light is different from that of the multi-path light beam described above. The third beam splitter 74 will reflect the multi-path spatial light (affecting the transmission direction of the multi-path spatial light) and transmit the multi-path light beam described above (without affecting the transmission direction of the multi-path light beam), so that the receiving process and the transmitting process of the optical communication do not interfere with each other.

[0053] In addition, to achieve the above purpose, the present application also proposes a laser communication method, which is applied to the laser communication device as described above. Figure 3 As shown, the steps of the laser communication method include: Step S10, collecting spot information of multiple light beams transmitted externally through a spatial light path adjustment module, and adjusting the transmission angle of each light beam based on the spot information; It should be noted that, in the present embodiment, multiple light beams can form multiple light paths in functional modules such as the spatial light path adjustment module, the phase adjustment module, and the photoelectric conversion module. When the light path adjustment module, the phase adjustment module and other functional modules transmit each light beam through each light path, they can also collect light beam information of each light beam transmitted in the multiple light paths, such as the transmission angle, distortion information, phase information, etc. of each light beam, and can control the corresponding functional modules respectively to adjust the light parameters of each light beam in each light path based on the above-mentioned collected various types of light beam information.

[0054] It is easy to understand that in this embodiment, the spatial optical path adjustment module can receive multiple light beams transmitted from the outside, and transmit each light beam to the phase adjustment module connected to the rear. In this process, the spatial optical path adjustment module can collect the spot information of the transmitted multiple light beams, and determine the transmission angles corresponding to each current light beam in three-dimensional space based on the spot information, so that the transmission angles of each light beam can be adjusted respectively according to the spot information, so that the transmission angles of each light beam received by the phase adjustment module remain consistent.

[0055] Step S20, collecting phase information of each light beam after adjusting the transmission angle through a phase adjustment module, and adjusting the phase of each light beam based on the phase information; It is easy to understand that in this embodiment, when the phase adjustment module receives each light beam with a consistent transmission angle, it can also transmit each light beam to the photoelectric conversion module. In this process, the phase information of each light beam can also be collected by the phase adjustment module, and the phase corresponding to each light beam can be determined based on the phase information, so that the phase of each light beam can be adjusted by the phase information, so that the phase of each light beam received by the photoelectric conversion module remains consistent.

[0056] Step S30, converting each phase-adjusted light beam into a communication signal through a photoelectric conversion module, and sending the communication signal to a communication receiving board.

[0057] It should be noted that, in the present embodiment, the photoelectric conversion module is electrically connected to the communication receiving board, and it also has a photoelectric coupling function. The photoelectric conversion module can couple the light beams whose phases are adjusted to be consistent to form a single light beam with high power, and perform photoelectric conversion on the single light beam to obtain a corresponding communication signal in the form of an electrical signal, and send the communication signal to the communication receiving board to complete the optical communication receiving process.

[0058] It is easy to understand that in this embodiment, since the spatial optical path adjustment module adjusts the transmission angle of each light beam to be consistent, the phase adjustment module can adjust the phase of each light beam to be consistent based on the received light beams with consistent transmission angles, so that the energy loss generated by the photoelectric conversion module when coupling the light beams is minimized. Since the input optical signal power in the photoelectric conversion process is proportional to the output electrical signal power, the signal quality of the communication signal can be improved, thereby improving the signal reception quality in the optical communication process.

[0059] Furthermore, in this embodiment, before the step of collecting the phase information of each light beam after adjusting the transmission angle through the phase adjustment module and adjusting the phase of each light beam based on the phase information, the step further includes: Step S201: Collect distortion information of each light beam after adjusting the transmission angle through a correction module, and perform wavefront adjustment on each light beam based on the distortion information.

[0060] It is easy to understand that in this embodiment, the correction module is arranged between the spatial optical path adjustment module and the phase adjustment module, and after receiving each light beam with an adjusted transmission angle, each light beam with an adjusted transmission angle can be transmitted to the phase adjustment module. In this process, the correction module can also collect distortion information of each light beam, and determine the distortion caused to each light beam by each component in each optical path based on the distortion information, so that the wavefront of each light beam can be adjusted according to the distortion information, so that the wavefront of each light beam can be as close to the original wavefront as possible, further improving the quality of optical communication.

[0061] Other embodiments of the laser communication method proposed in the embodiment of the present application can be implemented based on all the embodiments of the laser communication device described above, solving the technical problem of how to improve the signal reception quality of multi-channel laser communication. Compared with the prior art, the beneficial effects of the laser communication method provided in the embodiment of the present application are the same as the beneficial effects of the laser communication device provided in the above embodiment, which will not be described in detail here.

[0062] In addition, to achieve the above purpose, the present application also proposes a laser communication system, which uses the laser communication device described above. Since the laser communication system uses all the embodiments of the laser communication device described above, it should also have the beneficial effects brought by the embodiments of the laser communication device described above, which will not be described one by one here.

[0063] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A laser communication device, characterized in that: The laser communication device comprises: A spatial optical path adjustment module, used to transmit multiple optical beams transmitted externally to the phase adjustment module via multiple optical paths, and to adjust the transmission angle of each optical beam based on an optical path adjustment signal sent by the controller; The phase adjustment module is used to adjust the phase of each light beam after adjusting the transmission angle based on the phase adjustment signal sent by the controller, and transmit it to the photoelectric conversion module; The photoelectric conversion module is electrically connected to the communication receiving board, and is used to convert each light beam after adjusting the phase into a communication signal, and send the communication signal to the communication receiving board; The controller is electrically connected to the spatial optical path adjustment module and the phase adjustment module, respectively, and is used to collect the spot information corresponding to each light beam through the spatial optical path adjustment module, and send the corresponding optical path adjustment signal to the spatial optical path adjustment module based on the spot information, and to collect the phase information corresponding to each light beam through the phase adjustment module, and send the corresponding phase adjustment signal to the phase adjustment module based on the phase information.

2. The laser communication device according to claim 1, characterized in that: The phase adjustment module includes: a phase detection unit, a plurality of first beam splitters, a plurality of spatial optical couplers and a plurality of phase shifters; The phase detection unit is electrically connected to the controller, and each of the phase shifters is electrically connected to the controller respectively; In each optical path, a spatial optical coupler, a first beam splitter and a phase shifter are provided, and the first beam splitter is connected to the spatial optical coupler, the phase detection unit and the phase shifter respectively through an optical signal line; Each of the spatial optical couplers is used to convert each light beam from spatial light to dielectric light, and transmit the light beam to each of the first beam splitters through an optical signal line; Each of the first beam splitters is used to split each light beam and transmit the light beams to the phase detection unit and each of the phase shifters respectively; The phase detection unit is used to collect the phase information corresponding to each light beam emitted by each first beam splitter, and send it to the controller; Each of the phase shifters is used to adjust the phase of each light beam using the phase adjustment signal sent by the controller and send the phase to the photoelectric conversion module.

3. The laser communication device according to claim 1, characterized in that: The photoelectric conversion module includes: a dielectric optical coupler and a photoelectric detector; Each input end of the dielectric optical coupler is connected to the phase adjustment module through an optical signal line, the output end of the dielectric optical coupler is connected to the input end of the photodetector through an optical signal line, and the output end of the photodetector is electrically connected to the communication receiving board; The dielectric optical coupler is used to couple the light beams into a single light beam and transmit the single light beam to the photoelectric detector; The photoelectric detector is used to convert the single-path light beam into the communication signal and send the communication signal to the communication receiving board.

4. The laser communication device according to claim 1, characterized in that: The spatial optical path adjustment module includes: a plurality of galvanometers, a plurality of first beam splitters and a plurality of CCDs; Each of the galvanometers is electrically connected to the controller, and each of the CCDs is electrically connected to the controller; In each optical path, there is one galvanometer and one first beam splitter, and the first beam splitter is equipped with one CCD; Each of the galvanometers is used to adjust the transmission angle of each light beam based on the light path adjustment signal sent by the controller and transmit the light beam to each of the first beam splitters; Each of the first beam splitters is used to split each light beam emitted by each of the galvanometers, and emit the light beams to each of the CCDs and the phase adjustment module respectively; Each CCD is used to collect the light spot information corresponding to each light beam and transmit the light spot information to the controller.

5. The laser communication device according to claim 1, characterized in that: The laser communication device further includes: a correction module; The correction module is arranged on the optical path between the spatial optical path adjustment module and the phase adjustment module, and the correction module is electrically connected to the controller; The correction module is used to collect the distortion information corresponding to each light beam after adjusting the transmission angle, and send the distortion information to the controller; The controller is further used to control the correction module to correct the wavefront of each light beam based on the distortion information and transmit the corrected light beams to the phase adjustment module.

6. The laser communication device according to claim 5, characterized in that: The correction module includes: a plurality of second beam splitters, a plurality of Hartmann sensors and a plurality of deformable mirrors; Each of the Hardman sensors is electrically connected to the controller, and each of the deformable mirrors is electrically connected to the controller; In each optical path, one of the second beam splitter and one of the deformable mirrors is provided, and the second beam splitter is provided with one of the Hartmann sensors; Each of the second beam splitters is used to split each light beam after adjusting the transmission angle, and transmit the light beams to each of the Hardman sensors and each of the deformable mirrors respectively; Each of the Hartmann sensors is used to collect the distortion information corresponding to each light beam and transmit the distortion information to the controller; The controller is further used to control each of the deformable mirrors to correct the light surface corresponding to each light beam transmitted by each of the second beam splitters based on the distortion information.

7. The laser communication device according to any one of claims 1 to 6, characterized in that: The laser communication device further includes: a transmitting module; The transmitting module is arranged on the optical path between the spatial optical path adjustment module and the phase adjustment module, and the transmitting module is also connected to the communication transmitting board through an optical signal line; The transmitting module is used to convert the single-channel medium light emitted by the communication transmitting board into multiple-channel spatial light, and transmit each channel of spatial light to the spatial light path adjustment module via multiple light paths; The spatial optical path adjustment module is further used to adjust the transmission angle of each path of spatial light based on the optical path adjustment signal, and transmit the adjusted each path of spatial light to an external target communication device.

8. The laser communication device according to claim 7, characterized in that: The transmitting module comprises: a second beam splitter, an EDFA, a plurality of collimating mirrors and a plurality of third beam splitters; In each optical path, there is one third beam splitter, and one collimator is configured for the third beam splitter; The second beam splitter has a plurality of output ends, each output end is connected to a corresponding collimator through an optical signal line, the input end of the second beam splitter is connected to the output end of the EDFA through an optical signal line, and the input end of the EDFA is connected to the communication transmitting board through an optical signal line; The EDFA is used to amplify the power of the single-channel dielectric light emitted by the communication transmitting board and transmit it to the second beam splitter; The second beam splitter is used to split the single-path medium light after power amplification to obtain multiple-path medium light, and send them to each of the collimating lenses respectively; Each of the collimating mirrors is used to convert each of the split medium lights into parallel multi-path spatial lights, and transmit them to each of the third beam splitters respectively; Each of the third beam splitters is used to transmit multi-path spatial light to the spatial light path adjustment module.

9. A laser communication method, characterized in that: Applied to the laser communication device according to any one of claims 1 to 8, the steps of the laser communication method include: The spatial optical path adjustment module collects the spot information of the multiple light beams transmitted externally, and adjusts the transmission angle of each light beam based on the spot information; The phase adjustment module collects the phase information of each light beam after adjusting the transmission angle, and adjusts the phase of each light beam based on the phase information; Through the photoelectric conversion module, each light beam after phase adjustment is converted into a communication signal, and the communication signal is sent to the communication receiving board.

10. A laser communication system, characterized in that: The laser communication system adopts the laser communication device as described in any one of claims 1-8.

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