A laser communication device, method and system

Abstract

The application discloses a kind of laser communication device, method and system, it relates to laser communication technical field, the device includes spatial light path adjustment module, phase adjustment module, photoelectric conversion module and controller;Through spatial light path adjustment module, the multiple light beams transmitted by external transmission are emitted to photoelectric conversion module by phase adjustment module, then multiple light beams are converted into communication signals by photoelectric conversion module and are transmitted to communication receiving board, to complete optical communication.Wherein, controller collects the light spot information and phase information of multiple light beams by spatial light path adjustment module and phase adjustment module respectively, and according to light spot information, it controls the transmission angle of each light beam to be adjusted, and according to phase information, it controls the phase of each light beam to be adjusted, so that the phase of each light beam received by photoelectric conversion module remains highly consistent, so that the power of communication signal obtained by photoelectric conversion of photoelectric conversion module is greater, and the communication quality of laser communication is improved.

Description

TECHNICAL FIELD

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

[0002] In the prior art, in ground-based laser communication, atmospheric turbulence is an important factor affecting signal quality and communication performance. Multiple aperture diversity reception can be used to encode and fuse multiple optical signals to improve signal-to-noise ratio and reliability to cope with atmospheric turbulence interference. However, the multiple optical signals of the multiple aperture diversity reception may be subjected to different environmental interference, resulting in signal out-of-sync, which also leads to poor signal reception quality and unstable laser communication. SUMMARY

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

[0004] To achieve the above purpose, the present application provides a laser communication device, which comprises:

[0005] A spatial light path adjustment module is configured to emit multiple optical beams transmitted from outside to a phase adjustment module via multiple light paths, and adjust the transmission angles of the optical beams based on light path adjustment signals sent by a controller.

[0006] The phase adjustment module is configured to adjust the phases of the optical beams after the transmission angles are adjusted based on phase adjustment signals sent by the controller, and emit the optical beams to a photoelectric conversion module.

[0007] The photoelectric conversion module is electrically connected to a communication receiving board, configured to convert the optical beams after the phases are adjusted into communication signals, and send the communication signals to the communication receiving board.

[0008] The controller is electrically connected to the spatial light path adjustment module and the phase adjustment module, configured to collect spot information corresponding to the optical beams by the spatial light path adjustment module, send corresponding light path adjustment signals to the spatial light path adjustment module based on the spot information, and collect phase information corresponding to the optical beams by the phase adjustment module, and send corresponding phase adjustment signals to the phase adjustment module based on the phase information.

[0009] In an embodiment, the phase adjustment module comprises a phase detection unit, a plurality of first beam splitters, a plurality of spatial light couplers and a plurality of phase shifters.

[0010] The phase detection unit is electrically connected with the controller, and each of the phase shifters is electrically connected with the controller;

[0011] In each light path, a spatial light coupler, a first beam splitter and a phase shifter are arranged, and the first beam splitter is connected with the spatial light coupler, the phase detection unit and the phase shifter through optical signal lines respectively;

[0012] Each spatial light coupler is used for converting each light beam from spatial light into medium light and transmitting the medium light to each first beam splitter through an optical signal line;

[0013] Each first beam splitter is used for splitting each light beam and emitting the light beams to the phase detection unit and each phase shifter respectively;

[0014] The phase detection unit is used for collecting the phase information corresponding to each light beam emitted by each first beam splitter and sending the phase information to the controller;

[0015] Each phase shifter is used for adjusting the phase of each light beam according to the phase adjustment signal sent by the controller and sending the light beam to the photoelectric conversion module.

[0016] In an embodiment, the photoelectric conversion module comprises a medium light coupler and a photodetector.

[0017] Each input end of the medium light coupler is connected with the phase adjustment module through an optical signal line, an output end of the medium light coupler is connected with an input end of the photodetector through an optical signal line, and an output end of the photodetector is electrically connected with the communication receiving board.

[0018] The medium light coupler is used for coupling each light beam into a single light beam and emitting the single light beam to the photodetector.

[0019] The photodetector is used for converting the single light beam into the communication signal and sending the communication signal to the communication receiving board.

[0020] In an embodiment, the spatial light path adjustment module comprises a plurality of galvanometer mirrors, a plurality of first light splitters and a plurality of CCDs.

[0021] Each galvanometer mirror is electrically connected with the controller, and each CCD is electrically connected with the controller.

[0022] In each light path, one galvanometer mirror and one first light splitter are arranged, and the first light splitter is configured with one CCD.

[0023] Each of the galvanometer mirrors is configured to adjust a transmission angle of each of the light beams based on the optical path adjustment signal sent by the controller and emit the light beam to each of the first beam splitters;

[0024] Each of the first beam splitters is configured to split each of the light beams emitted by each of the galvanometer mirrors and emit the light beam to each of the CCDs and the phase adjustment module respectively;

[0025] Each of the CCDs is configured to collect the spot information corresponding to each of the light beams and transmit the spot information to the controller.

[0026] In an embodiment, the laser communication device further comprises a correction module;

[0027] The correction module is arranged on an optical path between the spatial optical path adjustment module and the phase adjustment module, and the correction module is electrically connected to the controller;

[0028] The correction module is configured to collect distortion information corresponding to each of the light beams after the transmission angle is adjusted and send the distortion information to the controller;

[0029] The controller is further configured to control the correction module to correct a wave surface of each of the light beams and emit the corrected light beam to the phase adjustment module based on the distortion information.

[0030] In an embodiment, the correction module comprises a plurality of second beam splitters, a plurality of Hartmann sensors and a plurality of deformable mirrors;

[0031] Each of the Hartmann sensors is electrically connected to the controller, and each of the deformable mirrors is electrically connected to the controller;

[0032] In each optical path, one of the second beam splitters and one of the deformable mirrors are arranged, and the second beam splitter is configured with one of the Hartmann sensors;

[0033] Each of the second beam splitters is configured to split each of the light beams after the transmission angle is adjusted and emit the light beam to each of the Hartmann sensors and each of the deformable mirrors respectively;

[0034] Each of the Hartmann sensors is configured to collect the distortion information corresponding to each of the light beams and transmit the distortion information to the controller;

[0035] The controller is further configured to control each of the deformable mirrors to correct a light surface of each of the light beams transmitted by each of the second beam splitters based on the distortion information.

[0036] In an embodiment, the laser communication device further comprises a transmitting module;

[0037] The emission module is arranged on the optical path between the spatial light path adjustment module and the phase adjustment module, and the emission module is further connected to a communication emission board through an optical signal line;

[0038] The emission module is configured to convert single-channel medium light emitted by the communication emission board into multiple-channel spatial light, and emit each channel of spatial light to the spatial light path adjustment module through multiple optical paths.

[0039] The spatial light path adjustment module is further configured to adjust the transmission angle of each channel of spatial light based on the optical path adjustment signal, and emit the adjusted spatial light to an external target communication device.

[0040] In an embodiment, the emission module includes a second beam splitter, an EDFA, a plurality of collimating mirrors, and a plurality of third beam splitters.

[0041] In each optical path, one third beam splitter is arranged, and the third beam splitter is configured with one collimating mirror.

[0042] The second beam splitter has a plurality of output ends, each of which is connected to one collimating mirror 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 emission board through an optical signal line.

[0043] The EDFA is configured to amplify the power of the single-channel medium light emitted by the communication emission board and transmit it to the second beam splitter.

[0044] The second beam splitter is configured to split the single-channel medium light after power amplification to obtain multiple-channel medium light and send it to each collimating mirror.

[0045] Each collimating mirror is configured to convert each channel of medium light after splitting into parallel multiple-channel spatial light and emit it to each third beam splitter.

[0046] Each third beam splitter is configured to emit multiple-channel spatial light to the spatial light path adjustment module.

[0047] In addition, to achieve the above-mentioned purpose, the present application further provides a laser communication method applied to the laser communication device as described above, and the steps of the laser communication method include:

[0048] The spatial light path adjustment module is configured to collect the spot information of the multiple-channel light beams transmitted externally, and adjust the transmission angle of each channel of light beam based on the spot information.

[0049] The phase adjustment module collects phase information of each light beam after the transmission angle is adjusted, and adjusts the phase of each light beam based on the phase information.

[0050] The photoelectric conversion module converts each light beam after the phase is adjusted into a communication signal, and sends the communication signal to a communication receiving board.

[0051] In addition, to achieve the above-mentioned purpose, the application also provides a laser communication system which adopts the laser communication device as described above.

[0052] The laser communication device, method and system provided by the embodiments of the application comprise a spatial light path adjustment module which is configured to emit a plurality of light beams transmitted from outside to a phase adjustment module in a plurality of light paths, and adjust the transmission angle of each light beam based on a light path adjustment signal sent by a controller; the phase adjustment module is configured to adjust the phase of each light beam after the transmission angle is adjusted based on a phase adjustment signal sent by the controller, and emit to a photoelectric conversion module; the photoelectric conversion module is electrically connected to a communication receiving board, and is configured to convert each light beam after the phase is adjusted into a communication signal, and send the communication signal to the communication receiving board; and the controller is electrically connected to the spatial light path adjustment module and the phase adjustment module respectively, and is configured to collect the corresponding spot information of each light beam by the spatial light path adjustment module, and send the corresponding light path adjustment signal to the spatial light path adjustment module based on the spot information, and collect the corresponding phase information of each light beam by the phase adjustment module, and send the corresponding phase adjustment signal to the phase adjustment module based on the phase information.

[0053] The plurality of light beams transmitted from outside are transmitted to the photoelectric conversion module by the spatial light path adjustment module through the phase adjustment module in a plurality of light paths, and then the plurality of light beams are converted into electrical signals by the photoelectric conversion module and transmitted to the communication receiving board, so that optical communication is completed. In this process, the controller can collect the spot information of the plurality of light beams by the spatial light path adjustment module, and control the transmission angle of each light beam to be adjusted according to the spot information, so that the transmission direction of each light beam input into the phase adjustment module remains consistent. The controller can also collect the phase information of each light beam by the phase adjustment module, and control the phase of each light beam to be adjusted according to the phase information, so that the phase of each light beam received by the photoelectric conversion module also remains consistent. Since the phase of each light beam received by the photoelectric conversion module is highly consistent, the power of the communication signal obtained by the photoelectric conversion module is greater, and the communication quality of the laser communication is improved. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application.

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings required to be used in the embodiments or prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0056] Figure 1 The structural schematic diagram provided for the first embodiment of the laser communication device of the present application is shown in the figure.

[0057] Figure 2 The structural schematic diagram provided for the second embodiment of the laser communication device of the present application is shown in the figure.

[0058] Figure 3 The flowchart provided for the first embodiment of the laser communication method of the present application is shown in the figure.

[0059] The purpose realization, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0060] 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.

[0061] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the drawings and specific embodiments of the present application.

[0062] The first embodiment of the laser communication device of the present application is proposed, please refer to Figure 1 The laser communication device comprises:

[0063] The spatial light path adjusting module 10 is used to emit the multiple light beams transmitted from outside to the phase adjusting module 20 through multiple light paths, and adjust the transmission angle of each light beam based on the light path adjusting signal sent by the controller 40;

[0064] The phase adjusting module 20 is used to adjust the phase of each light beam after adjusting the transmission angle based on the phase adjusting signal sent by the controller 40, and emit to the photoelectric conversion module 30;

[0065] The photoelectric conversion module 30 is electrically connected with 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;

[0066] The controller 40 is electrically connected with the spatial light path adjustment module 10 and the phase adjustment module 20 respectively, for collecting the light spot information corresponding to each light beam by the spatial light path adjustment module 10, and sending the corresponding light path adjustment signal to the spatial light path adjustment module 10 based on the light spot information, and collecting the phase information corresponding to each light beam by the phase adjustment module 20, and sending the corresponding phase adjustment signal to the phase adjustment module 20 based on the phase information.

[0067] It should be understood that the "light", "light beam", "light signal" and the like mentioned in the context can be one or more lasers with communication information.

[0068] It should be noted that in the present embodiment, the externally transmitted multi-channel light beam can be a multi-channel laser for laser communication emitted by a laser communication device or equipment far away. As a case, for example, in the scenario of ground-satellite communication, the laser communication device proposed in the present embodiment can be used as a laser communication device for communication between the ground station and the satellite. The ground station obtains the position, attitude, orbit and the like of the satellite, and uses a high-precision positioning system and a pointing control system to combine the orbit prediction information to make the laser communication device point to the direction where the satellite is located, and emit laser. The laser communication device on the satellite can search according to the approximate position of the ground station and the coverage range 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 starts to maintain the gaze with the satellite, and can scan and search 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 in the present embodiment.

[0069] In specific implementation, the spatial light path adjustment module 10 can first receive the externally transmitted multi-channel light beam, and emit it to the phase adjustment module 20, and then the phase adjustment module 20 emits the received multi-channel light beam to the photoelectric conversion module 30, converts the multi-channel light beam into a single-channel electrical signal form of communication signal by the photoelectric conversion module 30, and transmits it to the communication receiving board 50 to complete the process of receiving communication information. The communication receiving board 50 refers to an electronic device that can receive various forms of electrical signals such as analog signals, digital signals and pulse signals. It can also convert, amplify, demodulate and process the received electrical signals through the internal circuit and processor, and finally convert the electrical signals into useful information that can be recognized by the device or system.

[0070] It should be understood that the spot information refers to the distribution of the corresponding light beam in space, and specific parameters thereof include a spot shape (for example, a circular shape, an elliptical shape), a spot size (that is, an area of the spot on a certain cross section), a spot brightness distribution (that is, a relative distribution of light intensities of points in the spot, which is generally a Gaussian distribution, with the strongest light intensity at the center and gradually decreasing towards the edge), and the like, and the transmission angle (that is, a three-dimensional space angle in a three-dimensional coordinate system) of the corresponding light beam in space can be obtained through the spot information. The phase information refers to the phase angle of the light beam at the corresponding moment, and is used to describe the position of the light wave vibration. After coupling and superposition of light waves with the same phase, the actual output power is superposed, while after coupling and superposition of light waves with different phases, the output power cannot reach the ideal superposed power, and can even be significantly reduced.

[0071] It should be noted that in the embodiment, the plurality of light paths formed by the light beams pass through the spatial light path adjustment module 10, the phase adjustment module 20 and the photoelectric conversion module 30 in turn. In the above light paths, the spatial light path adjustment module 10 can also collect the spot information of the light beams in each light path, and transmit the spot information of the light beams to the controller 40. At the same time, the phase adjustment module 20 can also collect the phase information of the light beams in the light path, and transmit the phase information of the light beams to the controller 40. The controller 40 can determine the respective transmission angles of each light beam in the three-dimensional space through the received spot information, and send corresponding light path adjustment signals to the spatial light path adjustment module 10, so that the spatial light path adjustment module 10 can adjust the transmission angles of each light beam according to the light path adjustment signals, and finally make the light beams be transmitted to the phase adjustment module 20 with 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 corresponding phase adjustment signals 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 signals, and finally make the light beams be transmitted to the photoelectric conversion module 30 with the same phase. The photoelectric conversion module 30 can couple and superimpose the light beams with the same phase, and convert the light signals into electrical signals, obtain a communication signal with high power, and transmit the communication signal to the communication receiving board 50, so as to finally realize high-quality laser communication.

[0072] In the above communication process, since the spatial light path adjustment module 10 can adjust the spatial transmission angles of the light beams to be consistent and then transmit them to the phase adjustment module 20, the loss of optical signals caused by the large divergence angles of the multiple light beams or the failure of the rear stage to receive the optical signals can be prevented, the accuracy and stability of the optical signal transmission can be improved, and the accuracy of the operation of the phase adjustment module 20 can be ensured. The phase adjustment module 20 can also adjust the phases of the multiple light beams with consistent spatial transmission angles to be consistent, so that the energy loss of the coupled single light beam obtained by the optoelectronic conversion module 30 when coupling and superimposing the multiple light beams is minimized, the efficient optoelectronic conversion can be ensured, and thus the high-quality and high-power communication signals can be obtained and transmitted to the signal receiving board, and then the high-quality communication signal receiving can be achieved.

[0073] The embodiment of the present application provides a laser communication device, which comprises: a spatial light path adjustment module, configured to emit multiple light beams transmitted from outside to a phase adjustment module in multiple light paths, and adjust the transmission angles of the light beams based on a light path adjustment signal transmitted by a controller; the phase adjustment module, configured to adjust the phases of the light beams after the transmission angles are adjusted based on a phase adjustment signal transmitted by the controller, and emit the light beams to an optoelectronic conversion module; the optoelectronic conversion module, electrically connected with a communication receiving board, configured to convert the light beams after the phases are adjusted into communication signals, and transmit the communication signals to the communication receiving board; and the controller, electrically connected with the spatial light path adjustment module and the phase adjustment module respectively, configured to collect the spot information corresponding to the light beams by the spatial light path adjustment module, transmit the corresponding light path adjustment signal to the spatial light path adjustment module based on the spot information, collect the phase information corresponding to the light beams by the phase adjustment module, and transmit the corresponding phase adjustment signal to the phase adjustment module based on the phase information. The multiple light beams transmitted from outside are transmitted to the optoelectronic conversion module by the spatial light path adjustment module through the phase adjustment module in multiple light paths, and then the multiple light beams are converted into electrical signals by the optoelectronic conversion module and transmitted to the communication receiving board, so as to complete the optical communication. In the process, the controller can collect the spot information of the multiple light beams by the spatial light path adjustment module, and control the transmission angles of the light beams to be adjusted based on the spot information, so that the transmission directions of the light beams input into the phase adjustment module remain consistent. The controller can also collect the phase information of the light beams by the phase adjustment module, and control the phases of the light beams to be adjusted based on the phase information, so that the phases of the light beams received by the optoelectronic conversion module also remain consistent. Since the phases of the light beams received by the optoelectronic conversion module are highly consistent, the power of the communication signals obtained by the optoelectronic conversion module is larger, and the communication quality of the laser communication is improved.

[0074] Based on the first embodiment of the laser communication device, in the second embodiment of the laser communication device, the same or similar contents as the above embodiment one can be referred to the above introduction, and the subsequent will not be described. On this basis, please refer to Figure 2 The phase adjusting module 20 comprises a phase detection unit 21, a plurality of first beam splitters 22, a plurality of spatial light couplers 23 and a plurality of phase shifters 24.

[0075] The phase detection unit 21 is electrically connected with the controller 40, and each phase shifter 24 is electrically connected with the controller 40.

[0076] In each optical path, a spatial light coupler 23, a first beam splitter 22 and a phase shifter 24 are arranged, and the first beam splitter 22 is connected with the spatial light coupler 23, the phase detection unit 21 and the phase shifter 24 through optical signal lines.

[0077] Each spatial light coupler 23 is used for converting each light beam from spatial light to medium light and transmitting to each first beam splitter 22 through an optical signal line.

[0078] Each first beam splitter 22 is used for splitting each light beam and emitting to the phase detection unit 21 and each phase shifter 24.

[0079] The phase detection unit 21 is used for collecting the phase information corresponding to each light beam emitted by each first beam splitter 22 and sending to the controller 40.

[0080] Each phase shifter 24 is used for adjusting the phase of each light beam according to the phase adjusting signal sent by the controller 40 and sending to the photoelectric conversion module 30.

[0081] It should be noted that the optical signal line can be an optical fiber, and the light 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 multiple light beams can pass through the phase adjusting module 20 through multiple optical paths, and in each optical path passing through the phase adjusting module 20, a spatial light 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 with a corresponding spatial light coupler 23, a phase shifter 24 and a phase detection unit 21 through optical signal lines, and each phase shifter 24 is further connected to multiple input ends of the photoelectric conversion module 30 through optical signal lines.

[0082] The spatial light coupler 23 can convert spatial light into medium light, that is, convert one light beam transmitted in air into one light beam transmitted in an optical signal line, and transmit the light beam to a corresponding first beam splitter 22 through the medium provided by the optical signal line. Each first beam splitter 22 can divide the received one light beam into two light beams with different wavelengths. For the convenience of understanding, the first wavelength medium light is used for phase detection, and the second wavelength medium light is used for optical communication. The first beam splitter 22 can emit the first wavelength medium light obtained by beam splitting to the phase detection unit 21, and emit the second wavelength medium light obtained by beam splitting to the phase shifter 24. The phase detection unit 21 can detect the phase characteristics of each first wavelength medium light, and transmit the corresponding phase information to the controller 40, so that the controller 40 can send corresponding phase adjustment signals to each phase shifter 24 in each optical path based on the phase information of each first wavelength medium light, so that each phase shifter 24 adjusts the phase of each second wavelength medium light beam, thereby ensuring that the phases of each light beam emitted by each phase shifter 24 to the photoelectric conversion module 30 are consistent. Therefore, the multiple light beams entering the phase adjustment module 20 in the present application are not exactly the same as the multiple light beams emitted from the phase adjustment module 20, and there is a certain energy loss.

[0083] Further, in the present embodiment, the photoelectric conversion module 30 comprises a medium light coupler 31 and a photodetector 32.

[0084] The input end of the medium light coupler 31 is connected to the phase adjustment module 20 through an optical signal line, and the output end of the medium light coupler 31 is connected to the input end of the photodetector 32 through an optical signal line. The output end of the photodetector 32 is electrically connected to the communication receiving board 50.

[0085] The medium light coupler 31 is used for coupling each light beam into a single light beam, and emitting the single light beam to the photodetector 32.

[0086] The photodetector 32 is used for converting the single light beam into a communication signal, and sending the communication signal to the communication receiving board 50.

[0087] It should be noted that, in the present embodiment, the medium light 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 and convert the laser into an electrical signal and output the electrical signal. The power of the output electrical signal is proportional to the power of the input optical signal.

[0088] It is easy to understand that in the embodiment, the medium optical coupler 31 has a plurality of input ends, each of which can be connected with one of the phase shifters 24 of the phase adjustment module 20 described above through an optical signal line, so that a plurality of light beams with consistent phases can be received simultaneously, and the plurality of light beams with consistent phases can be coupled and superimposed into a single light beam, and the single light beam can be emitted to the photodetector 32. The photodetector 32 can convert the coupled single light beam into a corresponding electrical signal, i.e., a communication signal, and send the communication signal to the communication receiving board 50, thereby completing the receiving process of the laser communication.

[0089] Further, in the embodiment, the spatial light path adjustment module 10 includes a plurality of galvanometers 11, a plurality of first light splitters 12, and a plurality of CCDs 13.

[0090] Each of the galvanometers 11 is electrically connected with the controller 40, and each of the CCDs 13 is electrically connected with the controller 40.

[0091] In each light path, one of the galvanometers 11 and one of the first light splitters 12 are arranged, and the first light splitter 12 is configured with one of the CCDs 13.

[0092] Each of the galvanometers 11 is configured to adjust the transmission angle of each light beam based on the light path adjustment signal sent by the controller 40 and emit the light beam to each of the first light splitters 12.

[0093] Each of the first light splitters 12 is configured to split each light beam emitted by each of the galvanometers 11 and emit the light beam to each of the CCDs 13 and the phase adjustment module 20, respectively.

[0094] Each of the CCDs 13 is configured to collect the spot information corresponding to each light beam and transmit the spot information to the controller 40.

[0095] It should be noted that in the embodiment, the galvanometer 11 is an optical device that can use an electrical signal to drive the deflection angle of a light beam. The first light splitter 12 can be an energy light splitter that can split the energy of a light beam into transmitted light and reflected light according to a predetermined ratio, which can be achieved by optical structure design and coating technology. The CCD is a semiconductor photoelectric device, and its full name in English is Charge-Coupled Device, i.e., an electric charge-coupled device, which can convert an optical image into a digital electrical signal and transmit it.

[0096] It is easy to understand that in the embodiment, a galvanometer 11 and a first beam splitter 12 are arranged in each light path, each first beam splitter 12 is further provided with a CCD 13, the light beam can continue to transmit to the rear first beam splitter 12 through the galvanometer 11, the first beam splitter 12 reflects a small part of the energy of the light beam into the CCD 13, and transmits the most of the energy of the light beam to continue to output, that is, to emit to the phase adjustment module 20. Among them, the reflected light beam will form a light spot on the CCD 13, the CCD 13 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 corresponding light path adjustment signals based on the light spot information of each light beam, and transmit the light path adjustment signals to the corresponding galvanometer 11, so that the corresponding galvanometer 11 adjusts the transmission angle of the light beam on the light path. Finally, the transmission angles of each light beam (each transmitted light beam) on each light path are adjusted to be consistent before being emitted to the phase adjustment module 20, so that the phase adjustment module 20 works more accurately. Therefore, the multiple light beams entering the spatial light path adjustment module 10 in the application are not completely the same as the multiple light beams emitted from the spatial light path adjustment module 10, and there is a certain energy loss.

[0097] Further, in the embodiment, the laser communication device further comprises a correction module 60;

[0098] The correction module 60 is arranged on the light path between the spatial light path adjustment module 10 and the phase adjustment module 20, and the correction module 60 is electrically connected with the controller 40;

[0099] The correction module 60 is configured to collect distortion information corresponding to each light beam after adjusting the transmission angle, and send the distortion information to the controller 40.

[0100] The controller 40 is further configured to control the correction module 60 to correct the wave surface of each light beam based on the distortion information and emit the corrected each light beam to the phase adjustment module 20.

[0101] It should be noted that the distortion information can be understood as related information corresponding to the non-ideal state of the wavefront shape (or wave surface shape) and phase distribution of the light beam.

[0102] It is easy to understand that in the embodiment, a correction module 60 can also be arranged in each light path between the spatial light path adjustment module 10 and the phase adjustment module 20. The correction module 60 can receive each light beam emitted by the spatial light path adjustment module 10 after the transmission angle is adjusted, and emit each light beam to the phase adjustment module 20. In the process, the correction module 60 can also collect 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 by the optical device such as the first beam splitter 12 to the light beam. Based on the received distortion information of each light beam, the controller 40 can also send a corresponding distortion correction signal to the correction module 60 to make the correction module 60 correct the wavefront (wave surface) of each light beam, reduce the wavefront (wave surface) distortion of the light beam, and ensure the authenticity of the wavefront (wave surface) of the light beam. The quality of the light beam can be improved.

[0103] Further, in the 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.

[0104] Each of the Hartmann sensors 62 is electrically connected to the controller 40, and each of the deformable mirrors 63 is electrically connected to the controller 40.

[0105] In each light path, one of the second beam splitters 61 and one of the deformable mirrors 63 are arranged, and the second beam splitter 61 is arranged with one of the Hartmann sensors 62.

[0106] Each of the second beam splitters 61 is used to split each light beam after the transmission angle is adjusted and emit each light beam to each of the Hartmann sensors 62 and each of the deformable mirrors 63, respectively.

[0107] 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.

[0108] The controller 40 is also used to control each of the deformable mirrors 63 to correct the light surface corresponding to each light beam transmitted by each of the second beam splitters 61 based on the distortion information.

[0109] It should be noted that in the embodiment, the Hartmann sensor 62 is a sensor for measuring the surface error of a lens, a prism or the like. The deformable mirror 63 is an optical element for changing the optical path of the light wave wavefront transmission or changing the refractive index of the transmission medium to change the phase structure of the incident light beam wavefront, thereby correcting the phase of the light wave surface.

[0110] 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 described again. In the embodiment, a second beam splitter 61 and a deformable mirror 63 can be arranged in each light path, and the second beam splitter 61 is also correspondingly provided with a Hartmann sensor 62. When the second beam splitter 61 receives the light beam, the light beam can be split to form a reflected light beam and a transmitted light beam, and the reflected light beam is emitted to the corresponding Hartmann sensor 62, and the transmitted light beam is emitted to the corresponding deformable mirror 63. When the Hartmann sensor 62 receives the reflected light beam, the Hartmann sensor 62 can detect the optical distortion of the original light beam passing through the second beam splitter 61 and the like series of optical elements, and 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 in each light path based on the distortion information corresponding to each light beam, and each deformable mirror 63 can correct the wavefront (wave surface) of the corresponding transmitted light beam based on the corresponding distortion correction signal, and emit each light beam after the wavefront (wave surface) correction to the phase adjustment module 20.

[0111] Further, in the embodiment, the laser communication device further comprises a transmitting module 70;

[0112] The transmitting module 70 is arranged on the light path between the spatial light path adjustment module 10 and the phase adjustment module 20, and the transmitting module 70 is also connected to a communication transmitting board 80 through an optical signal line;

[0113] The transmitting module 70 is configured to convert single-channel medium light emitted by the communication transmitting board 80 into multiple-channel spatial light, and emit each channel of spatial light to the spatial light path adjustment module 10 in multiple light paths;

[0114] The spatial light path adjustment module 10 is further configured to adjust the transmission angle of each channel of spatial light based on the light path adjustment signal, and emit the adjusted each channel of spatial light to an external target communication device 90.

[0115] It should be noted that in the embodiment, the laser communication device can also send multiple light beams to the external target communication device 90 to realize the transmitting process of laser communication. The target communication device 90 can be a communication device or equipment capable of receiving laser light beams or laser signals, and the structure thereof can be the same as that of the laser communication device proposed in the embodiment.

[0116] It is easy to understand that the communication transmitting board 80 is a device capable of converting electronic signals into electromagnetic waves and radiating them out, which can output corresponding single-channel light beams based on received electrical signals, and the power of the electrical signals is proportional to the power of the light beams. In the embodiment, the transmitting module 70 can be connected with the communication transmitting board 80 through an optical signal line, the communication transmitting board 80 can transmit single-channel medium light converted by electrical signals to the transmitting module 70, the transmitting module 70 can convert the single-channel medium light into multi-channel spatial light and transmit it to the spatial light path adjusting module 10 in multiple light paths, and the spatial light path adjusting module 10 can receive each channel of spatial light transmitted from the transmitting module 70 and transmit it to the external target communication device 90. Wherein, the spatial light path adjusting module 10 can also adjust the transmission angle of each channel of spatial light based on the light path adjusting signal, and transmit each channel of spatial light with the adjusted transmission angle.

[0117] It is worth noting that in the embodiment, the laser communication process includes the emission of laser and the reception of laser, and the directions are opposite. The multiple light paths corresponding to each channel of spatial light emitted by the transmitting module 70 overlap with the multiple light paths emitted by the spatial light path adjusting module 10 to the phase adjusting module 20 described above, and the directions of the light beams are opposite.

[0118] Further, in the embodiment, the transmitting module 70 comprises: a second beam splitter 72, an EDFA 71, a plurality of collimating mirrors 73, and a plurality of third beam splitters 74.

[0119] In each light path, one of the third beam splitters 74 is arranged, and the third beam splitter 74 is configured with one of the collimating mirrors 73.

[0120] The second beam splitter 72 has a plurality of output ends, each of which is connected with one of the collimating mirrors 73 through an optical signal line respectively, the input end of the second beam splitter 72 is connected with the output end of the EDFA 71 through an optical signal line, and the input end of the EDFA 71 is connected with the communication transmitting board 80 through an optical signal line.

[0121] The EDFA 71 is configured to amplify the power of the single-channel medium light transmitted by the communication transmitting board 80 and transmit it to the second beam splitter 72.

[0122] The second beam splitter 72 is configured to split the single-channel medium light after power amplification to obtain multi-channel medium light and transmit it to each of the collimating mirrors 73 respectively.

[0123] Each of the collimating mirrors 73 is configured to convert each channel of medium light after splitting into parallel multi-channel spatial light and transmit it to each of the third beam splitters 74 respectively.

[0124] Each of the third beam splitters 74 is configured to emit the multiple spatial light beams to the spatial light path adjustment module 10.

[0125] It should be noted that in the embodiment, the second beam splitter 72 is a single-input multiple-output beam splitter, which can split a single light beam into multiple light beams. The EDFA is an English full name of Erbium-Doped Fiber Amplifier, i.e., 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 in the optical signal line. The collimating mirror 73 is an optical element for converting the 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.

[0126] It is easy to understand that in the embodiment, the communication transmitting board 80 first sends a single medium light to the EDFA 71 through the optical signal line, and the EDFA 71 amplifies the power of the single medium light and transmits it to the second beam splitter 72. The second beam splitter 72 can split the single medium light to obtain multiple medium light beams, and emit them to the collimating mirrors 73 through multiple optical signal lines, respectively. Each collimating mirror 73 converts each medium light beam into a parallel multiple spatial light beam and emits it to the corresponding third beam splitter 74 of each light path. In the embodiment, the third beam splitter 74 only reflects the multiple spatial light beams of a specific wavelength, so that each spatial light beam enters the multiple light paths described above and is emitted to the spatial light path adjustment module 10, respectively.

[0127] It is worth noting that the multiple spatial light beams have different wavelengths from the multiple light beams described above. The third beam splitter 74 reflects the multiple spatial light beams (affects the transmission direction of the multiple spatial light beams), and transmits the multiple light beams described above (does not affect the transmission direction of the multiple light beams), so that the receiving process of the optical communication does not interfere with the transmitting process.

[0128] In addition, in order to achieve the above-mentioned purpose, the application further provides a laser communication method applied to the laser communication device as described above, such as Figure 3 As shown in the figure, the steps of the laser communication method include:

[0129] In step S10, the spatial light path adjustment module is used to collect the spot information of the multiple light beams transmitted from the outside, and the transmission angle of each light beam is adjusted based on the spot information.

[0130] It should be noted that in the embodiment, the multiple light beams can form multiple light paths in the spatial light path adjustment module, the phase adjustment module, the photoelectric conversion module and the like, and the light path adjustment module, the phase adjustment module and the like can also collect the light beam information of each light beam transmitted in the multiple light paths when transmitting each light beam through each light path, such as the transmission angle, distortion information, phase information and the like of each light beam, and can control the corresponding functional module to adjust the light parameters of each light beam in each light path based on the above-mentioned collected light beam information.

[0131] It is easy to understand that in the embodiment, the spatial light path adjustment module can receive the externally transmitted multiple light beams and emit each light beam to the rear connected phase adjustment module. In this process, the spatial light path adjustment module can collect the spot information of the transmitted multiple light beams, and determine the respective transmission angles of each light beam in the three-dimensional space based on the spot information, so that the transmission angles of each light beam received by the phase adjustment module can be adjusted respectively based on the spot information.

[0132] In step S20, 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.

[0133] It is easy to understand that in the embodiment, when the phase adjustment module receives each light beam with consistent transmission angle, the phase adjustment module can also emit each light beam to the photoelectric conversion module. In this process, the phase adjustment module can also collect the phase information of each light beam, and determine the respective phases of each light beam based on the phase information, so that the phases of each light beam received by the photoelectric conversion module can be adjusted based on the phase information.

[0134] In step S30, the photoelectric conversion module converts each light beam after adjusting the phase into a communication signal, and sends the communication signal to the communication receiving board.

[0135] It should be noted that in the embodiment, the photoelectric conversion module is electrically connected with the communication receiving board, and has a photoelectric coupling function. The photoelectric conversion module can couple each light beam with consistent phase to form a single light beam with high power, and can photoelectrically convert 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 receiving process of optical communication.

[0136] It is easy to understand that, in the embodiment, since the spatial light path adjustment module adjusts the transmission angles of the light beams to be consistent, the phase adjustment module can further adjust the phases of the light beams to be consistent based on the received light beams with consistent transmission angles, so that the energy loss of the optoelectronic conversion module is minimized when coupling the light beams, and since the input light signal power in the optoelectronic conversion process is proportional to the output electric signal power, the signal quality of the communication signal can be improved, thereby improving the signal receiving quality in the optical communication process.

[0137] Further, in the embodiment, before the step of collecting, by the phase adjustment module, the phase information of the light beams after the transmission angle adjustment and adjusting the phases of the light beams based on the phase information, the method further comprises:

[0138] In step S201, the distortion information of the light beams after the transmission angle adjustment is collected by the correction module, and the wave surface of the light beams is adjusted based on the distortion information.

[0139] It is easy to understand that, in the embodiment, the correction module is arranged between the spatial light path adjustment module and the phase adjustment module, and can emit the light beams after the transmission angle adjustment to the phase adjustment module after receiving the light beams after the transmission angle adjustment. In this process, the correction module can also collect the distortion information of the light beams, and determine the distortion of the light beams caused by each element in each light path based on the distortion information, so that the wave surface of the light beams can be adjusted based on the distortion information to make the wave surface of the light beams as close to the original wave surface as possible, thereby further improving the optical communication quality.

[0140] Other embodiments of the laser communication method provided by the present application can be implemented based on all the embodiments of the laser communication device described above, and solve the technical problem of how to improve the signal receiving quality of multi-channel laser communication. Compared with the prior art, the laser communication method provided by the embodiments of the present application has the same beneficial effects as the laser communication device provided by the above-mentioned embodiments, and will not be described here.

[0141] In addition, in order to achieve the above-mentioned purpose, the present application also provides a laser communication system which adopts the laser communication device as described above. Since the laser communication system adopts all the embodiments of the laser communication device as described above, it should also have the beneficial effects brought by each embodiment of the laser communication device, which will not be described here.

[0142] The above merely preferred embodiments of the present application, and not therefore limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the content 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 by, The laser communication device, used for Earth-to-space communication, includes: The spatial optical path adjustment module is used to transmit multiple externally transmitted beams to the phase adjustment module through multiple optical paths, and adjust the transmission angle of each beam based on the optical path adjustment signal sent by the controller. The phase adjustment module is used to adjust the phase of each beam after adjusting the transmission angle based on the phase adjustment signal sent by the controller, and then transmit it to the photoelectric conversion module. The photoelectric conversion module is electrically connected to the communication receiving board and is used to couple the phase-adjusted beams of light and then convert them into communication signals, and send the communication signals to the communication receiving board. The controller is electrically connected to the spatial optical path adjustment module and the phase adjustment module, respectively. It is used to collect the spot information corresponding to each 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. It also collects the phase information corresponding to each beam through the phase adjustment module and sends the corresponding phase adjustment signal to the phase adjustment module based on the phase information. The laser communication device further includes: a calibration module; The correction module is disposed 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 distortion information corresponding to each beam after adjusting the transmission angle, and send the distortion information to the controller; The controller is also used to control the correction module to correct the wavefront of each beam based on the distortion information and to transmit the corrected beams to the phase adjustment module. The correction module includes: several second beam splitters, several Hardmann sensors, and several deformable mirrors; Each of the Hartmann sensors is electrically connected to the controller, and each of the deformable mirrors is electrically connected to the controller. In each optical path, there is a second beam splitter and a deformable mirror, and the second beam splitter is equipped with a Hardman sensor; Each of the second beam splitters is used to split the beams after the transmission angle is adjusted, and to transmit them to each of the Hartmann sensors and each of the deformable mirrors respectively; Each of the aforementioned Hardmann sensors is used to collect the distortion information corresponding to each beam and transmit the distortion information to the controller; The controller is also configured to, based on the distortion information, control each of the deformable mirrors to correct the optical surfaces corresponding to each beam transmitted by each of the second beam splitters; The phase adjustment module includes: a phase detection unit, several first beam splitters, several spatial optical couplers, and several phase shifters; The phase detection unit is electrically connected to the controller, and each of the phase shifters is electrically connected to the controller. In each optical path, there is a spatial optical coupler, a first beam splitter, and a phase shifter. The first beam splitter is connected to the spatial optical coupler, the phase detection unit, and the phase shifter through optical signal lines, respectively. Each of the spatial light couplers is configured to convert each of the light beams from spatial light to medium light and transmit the medium light to each of the first beam splitters through an optical signal line; Each of the first beam splitters is configured to split each of the light beams and transmit the light beams to the phase detection unit and each of the phase shifters, respectively; The phase detection unit is configured to collect the phase information corresponding to each of the light beams transmitted by each of the first beam splitters and transmit the phase information to the controller; Each of the phase shifters is configured to adjust the phase of each of the light beams based on the phase adjustment signal transmitted by the controller and transmit the light beams to the photoelectric conversion module; The spatial light path adjustment module comprises a plurality of galvanometer mirrors, a plurality of first light splitters and a plurality of CCDs; Each of the galvanometer mirrors is electrically connected to the controller, and each of the CCDs is electrically connected to the controller; In each light path, one of the galvanometer mirrors and one of the first light splitters are arranged, and the first light splitter is configured with one of the CCDs; Each of the galvanometer mirrors is configured to adjust the transmission angle of each of the light beams based on the light path adjustment signal transmitted by the controller and transmit the light beams to each of the first light splitters; Each of the first light splitters is configured to split each of the light beams transmitted by each of the galvanometer mirrors and transmit the light beams to each of the CCDs and the phase adjustment module, respectively; Each of the CCDs is configured to collect the spot information corresponding to each of the light beams and transmit the spot information to the controller.

2. The laser communication device of claim 1, wherein, The photoelectric conversion module comprises a medium light coupler and a photodetector; Each input end of the medium light coupler is connected to the phase adjustment module through an optical signal line, an output end of the medium light coupler is connected to an input end of the photodetector through an optical signal line, and an output end of the photodetector is electrically connected to the communication receiving board; The medium light coupler is configured to couple each of the light beams into a single light beam and transmit the single light beam to the photodetector; The photodetector is configured to convert the single light beam into the communication signal and transmit the communication signal to the communication receiving board.

3. The laser communication device of any one of claims 1-2, wherein, The laser communication device further comprises a transmitting module; The transmitting module is arranged on a light path between the spatial light path adjustment module and the phase adjustment module, and the transmitting module is further connected to a communication transmitting board through an optical signal line; The transmitting module is configured to convert single medium light transmitted by the communication transmitting board into multiple spatial light beams and transmit the spatial light beams to the spatial light path adjustment module through multiple light paths; The spatial light path adjustment module is further configured to adjust the transmission angle of each of the spatial light beams based on the light path adjustment signal and transmit the adjusted spatial light beams to an external target communication device.

4. The laser communication device of claim 3, wherein, The transmitting module comprises a second beam splitter, an EDFA, a plurality of collimating mirrors and a plurality of third light splitters; In each light path, one of the third light splitters is arranged, and the third light splitter is configured with one of the collimating mirrors; The second beam splitter has a plurality of outputs, each of which is connected to a corresponding collimating mirror through an optical signal line, and the input of the second beam splitter is connected to the output of the EDFA through an optical signal line, and the input 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 medium light transmitted by the communication transmitting board and transmit it to the second beam splitter; The second beam splitter is used to split the single-channel medium light after power amplification to obtain multi-channel medium light and transmit it to each collimating mirror respectively; Each collimating mirror is used to convert each channel of medium light after splitting into parallel multi-channel spatial light and transmit it to each third beam splitter respectively; Each third beam splitter is used to transmit multi-channel spatial light to the spatial light path adjustment module.

5. A laser communication method, characterized by, The laser communication method is applied to the laser communication device of any one of claims 1-4, and the steps of the laser communication method comprise: Through the spatial light path adjustment module, the spot information of the multi-channel light beams transmitted externally is collected, and the transmission angle of each channel of light beam is adjusted based on the spot information; Through the correction module, the distortion information corresponding to each channel of light beam after adjusting the transmission angle is collected, and the wave surface of each channel of light beam is adjusted based on the distortion information; Through the phase adjustment module, the phase information of each channel of light beam after adjusting the transmission angle and adjusting the wave surface is collected, and the phase of each channel of light beam is adjusted based on the phase information; Through the photoelectric conversion module, each channel of light beam after adjusting the phase is converted into a communication signal, and the communication signal is transmitted to the communication receiving board.

6. A laser communication system, characterized by The laser communication system adopts the laser communication device of any one of claims 1-4.

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