Two-way beacon-free laser communication device and method compatible with two states

Abstract

The invention provides a two-way beacon-free laser communication device and method compatible with two states, and relates to the technical field of laser communication, and the device comprises a laser receiving and transmitting assembly which is used for carrying out beam shrinkage on laser carrying signals, and emitting a laser beam transmitted along a first emergent light path after beam shrinkage; the light transmission assembly is arranged on the first emergent light path, receives the laser beam and outputs the laser beam in two paths; one path of output is transmitted along a second emergent light path, and the other path of output is transmitted along a third emergent light path; the first signal receiving and transmitting unit and the second signal receiving and transmitting unit are arranged on a two-path output transmission light path; the control unit is used for controlling the current state to be a first state or a second state; the first signal transceiving unit is a signal receiving end and the second signal transceiving unit is a signal transmitting end in the first state, and the first signal transceiving unit is a signal transmitting end and the second signal transceiving unit is a signal receiving end in the second state. The size of the bidirectional beacon-free laser communication device can be reduced, and the production cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser communication, and particularly to a bidirectional beaconless laser communication device and method compatible with dual states. Background Art

[0002] A laser communication device is an integrated device of an optical fiber collimation system, an optical beam expander system, and a tracking and execution system. It is a coupling device that uses an optical fiber for free-space laser communication reception and can achieve the function of coupling and collecting free-space light.

[0003] With the increasing demand for the Internet, higher requirements are put forward for the data transmission volume and transmission speed of laser communication. At present, most laser communications are realized based on optical fiber networks. Since optical cables need to be laid out in optical fiber networks and the cost of optical cables is relatively high, the cost of realizing laser communication based on optical fiber networks is relatively high, and there is also a risk of optical cable damage. In order to meet the demand for laser communication, a bidirectional beaconless laser communication device with multiple channels has emerged. However, at present, the integration degree of the bidirectional beaconless laser communication device with multiple channels is relatively low, resulting in a relatively large volume and high production cost. Summary of the Invention

[0004] The present invention provides a bidirectional beaconless laser communication device and method compatible with dual states, aiming to solve the defect that the integration degree of the existing bidirectional beaconless laser communication device with multiple channels is relatively low, resulting in a relatively large volume and high cost, and to achieve the purpose of improving the integration degree of the bidirectional beaconless laser communication device, reducing the volume of the bidirectional beaconless laser communication device, and lowering the production cost.

[0005] The present invention provides a bidirectional beaconless laser communication device compatible with dual states, including a laser transceiver assembly, an optical transmission assembly, a first signal transceiver unit, a second signal transceiver unit, and a control unit.

[0006] The laser transceiver assembly is used for beam shrinking the laser carrying a signal and emitting the beam-shrunk laser beam; the laser beam is transmitted along a first emission optical path.

[0007] The optical transmission assembly is arranged on the first emission optical path and is used for receiving the laser beam and outputting it in two paths; wherein, one output is transmitted along a second emission optical path, and the other output is transmitted along a third emission optical path.

[0008] The first signal transceiver unit is arranged on the second emission optical path and is used for forming a first optical reception path or a first optical emission path with the optical transmission assembly.

[0009] The second signal transceiver unit is arranged on the third emission optical path and is used for forming a second optical reception path or a second optical emission path with the optical transmission assembly.

[0010] A control unit, coupled to the first signal transceiver unit and the second signal transceiver unit, is configured to control the current state to be the first state or the second state; in the first state, the control unit controls the first signal transceiver unit to be a signal receiving end and controls the second signal transceiver unit to be a signal transmitting end, so that the first signal transceiver unit and the optical transmission component form a first optical receiving path, and the second signal transceiver unit and the optical transmission component form a second optical transmitting path; in the second state, the control unit controls the first signal transceiver unit to be a signal transmitting end and controls the second signal transceiver unit to be a signal receiving end, so that the first signal transceiver unit and the optical transmission component form a first optical transmitting path, and the second signal transceiver unit and the optical transmission component form a second optical receiving path; the working wavelengths of the first signal transceiver unit and the second signal transceiver unit are different.

[0011] According to a bidirectional beaconless laser communication device compatible with dual states provided by the present invention, the optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector; the first fast steering mirror is disposed on the first outgoing optical path, the first beam splitter is disposed on the reflected optical path of the first fast steering mirror, the dichroic mirror is disposed on the transmitted optical path of the first beam splitter, and the second fast steering mirror is disposed on the reflected optical path of the dichroic mirror; the tracking detector is disposed on the reflected optical path of the first beam splitter, the tracking lens group is disposed at the focal position of the tracking detector, and the narrowband switch is disposed between the first beam splitter and the tracking lens group.

[0012] According to a bidirectional beaconless laser communication device compatible with dual states provided by the present invention, it further includes an optical axis alignment component; the optical axis alignment component includes an optical axis monitoring camera and a second beam splitter; the second beam splitter is disposed between the first fast steering mirror and the laser transceiver component, the first fast steering mirror is located on the transmitted optical path of the second beam splitter, and the optical axis monitoring camera is disposed on the reflected optical path of the second beam splitter.

[0013] According to a bidirectional beaconless laser communication device compatible with dual states provided by the present invention, the transmittance ratio of the second beam splitter is 99:1.

[0014] According to a dual-state compatible bidirectional beacon-free laser communication device provided by the present invention, a first signal transceiver unit includes a first transceiver end, a second transceiver end, a first collimating lens and a first optical fiber circulator; the first collimating lens is arranged between the first transceiver end and the first optical fiber circulator; the optical fiber end of the first optical fiber circulator is arranged at the focal position of the first collimating lens, the transmitting end of the first optical fiber circulator is used to transmit a first collimated light beam of a first wavelength, the receiving end of the first optical fiber circulator is coupled with the second transceiver end, and the receiving end of the first optical fiber circulator is used to receive a laser beam of a first wavelength; the second signal transceiver unit includes a third transceiver end, a fourth transceiver end, a second collimating lens and a second optical fiber circulator; the second collimating lens is arranged between the third transceiver end and the second optical fiber circulator; the optical fiber end of the second optical fiber circulator is arranged at the focal position of the second collimating lens, the transmitting end of the second optical fiber circulator is used to transmit a second collimated light beam of a second wavelength, the receiving end of the second optical fiber circulator is coupled with the fourth transceiver end, and the receiving end of the second optical fiber circulator is used to receive a laser beam of a second wavelength.

[0015] According to a dual-state compatible bidirectional beacon-free laser communication device provided by the present invention, the first signal receiver also includes: a first filter, the first filter is connected to the receiving end and the second transceiver end of the first optical fiber circulator; the second signal receiver also includes: a second filter, the second filter is connected to the receiving end and the fourth transceiver end of the second optical fiber circulator.

[0016] According to a dual-state compatible bidirectional beacon-free laser communication device provided by the present invention, the laser transceiver assembly includes a primary mirror, a secondary mirror and an eyepiece; the primary mirror and the secondary mirror are arranged opposite to each other, the secondary mirror is arranged on the reflected light path of the primary mirror, and the eyepiece is arranged on the reflected light path of the secondary mirror.

[0017] The present invention also provides a dual-state compatible bidirectional beacon-free laser communication, which is applied to any of the above-mentioned dual-state compatible bidirectional beacon-free laser communication devices, and the method includes the following steps.

[0018] The laser is emitted to the laser transceiver component, the laser is beam-contracted by the laser transceiver component to obtain a beam-contracted laser beam, and the laser beam is emitted to the optical transmission component by the laser transceiver component; the current state is set to the first state; in the first state, a first optical receiving path is established based on the optical transmission component and the first signal transceiver unit; and a second optical transmitting path is established based on the optical transmission component and the second signal transceiver unit; or, the current state is set to the second state; in the second state, a second optical receiving path is established based on the optical transmission component and the second signal transceiver unit; and a first optical transmitting path is established based on the optical transmission component and the first signal transceiver unit.

[0019] A bidirectional beaconless laser communication method compatible with dual states according to the present invention. The optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector. Based on the optical transmission component and the first signal transceiver unit, a first optical receiving path is established, including: reflecting a laser beam through the first beam splitter into the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; the first laser beam is reflected by the first beam splitter into the narrowband switch, enters the tracking lens group through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis; the second laser beam is transmitted through the first beam splitter into the dichroic mirror, and is transmitted through the dichroic mirror into the first signal transceiver unit to complete the establishment of the first optical receiving path. Based on the optical transmission component and the second signal transceiver unit, a second optical transmitting path is established, including: the second signal transceiver unit emits a first collimated beam carrying a signal, the first collimated beam is reflected by the second fast steering mirror and then enters the dichroic mirror, is transmitted through the dichroic mirror and then enters the first beam splitter, is transmitted through the first beam splitter and then enters the first fast steering mirror, and is reflected by the first fast steering mirror and then enters the laser transceiver component to complete the establishment of the second optical transmitting path.

[0020] A bidirectional beaconless laser communication method compatible with dual states according to the present invention. The optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector. Based on the optical transmission component and the second signal transceiver unit, a second optical receiving path is established, including: reflecting a laser beam through the first beam splitter into the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; the first laser beam is reflected by the first beam splitter into the narrowband switch, enters the tracking lens group through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis; the second laser beam is transmitted through the first beam splitter into the dichroic mirror, is reflected by the dichroic mirror and then enters the second fast steering mirror, and is reflected by the second fast steering mirror and then enters the second signal transceiver unit to complete the establishment of the second optical receiving path. Based on the optical transmission component and the first signal transceiver unit, a first optical transmitting path is established, including: the first signal transceiver unit emits a second collimated beam carrying a signal, the second collimated beam is transmitted through the dichroic mirror and then enters the first beam splitter, is transmitted through the first beam splitter and then enters the first fast steering mirror, and is reflected by the first fast steering mirror and then enters the laser transceiver component to complete the establishment of the first optical transmitting path.

[0021] The compatible dual-state two-way beaconless laser communication device and method provided by the present invention include a laser transceiver assembly, an optical transmission assembly, a first signal transceiver unit, a second signal transceiver unit, and a control unit. The laser transceiver assembly is used to reduce the beam of the laser carrying the signal and emit the reduced laser beam; the laser beam is transmitted along a first emission optical path; the optical transmission assembly is arranged on the first emission optical path and is used to receive the laser beam and output it in two paths; wherein, one output is transmitted along a second emission optical path, and the other output is transmitted along a third emission optical path; the first signal transceiver unit is arranged on the second emission optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission assembly; the second signal transceiver unit is arranged on the third emission optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission assembly; the control unit is coupled to the first signal transceiver unit and the second signal transceiver unit and is used to control the current state to be the first state or the second state; in the first state, the control unit controls the first signal transceiver unit to be a signal receiving end and controls the second signal transceiver unit to be a signal transmitting end, so that the first signal transceiver unit and the optical transmission assembly form a first optical receiving path, and the second signal transceiver unit and the optical transmission assembly form a second optical transmitting path; in the second state, the control unit controls the first signal transceiver unit to be a signal transmitting end and controls the second signal transceiver unit to be a signal receiving end, so that the first signal transceiver unit and the optical transmission assembly form a first optical transmitting path, and the second signal transceiver unit and the optical transmission assembly form a second optical receiving path; the working wavelengths of the first signal transceiver unit and the second signal transceiver unit are different. It can be seen that the present invention can realize two-way beaconless laser communication in two dual states based on one optical transmission assembly, with high integration, which makes the device volume smaller, the overall design simpler, can effectively reduce the production cost, and at the same time can ensure the accuracy of two-way beaconless laser communication, effectively solving the problem in the prior art that the integration of multi-channel two-way beaconless laser communication devices is relatively low, resulting in a larger volume and higher cost, and achieving the purpose of improving the integration of two-way beaconless laser communication devices, reducing the volume of two-way beaconless laser communication devices and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is one of the structural schematic diagrams of the compatible dual-state two-way beaconless laser communication device provided by the present invention.

[0024] Figure 2It is the second schematic structural diagram of the compatible dual-state two-way beaconless laser communication device provided by the present invention.

[0025] Figure 3 It is one of the schematic structural diagrams of the first signal transceiver unit and the second signal transceiver unit in the compatible dual-state two-way beaconless laser communication device provided by the present invention.

[0026] Figure 4 It is the second schematic structural diagram of the first signal transceiver unit and the second signal transceiver unit in the compatible dual-state two-way beaconless laser communication device provided by the present invention.

[0027] Figure 5 It is the schematic flow diagram of the compatible dual-state two-way beaconless laser communication method provided by the present invention.

[0028] Reference signs: 1: primary mirror; 2: secondary mirror; 3: eyepiece; 4: first fast steering mirror; 5: first beam splitter; 6: dichroic mirror; 7: second fast steering mirror; 8: narrowband switch; 9: tracking lens group; 10: tracking detector; 11: optical axis monitoring camera; 12: second beam splitter; 13: first signal transceiver unit; 14: second signal transceiver unit; 15: control unit; 13-1: first transceiver end; 13-2: first collimating lens; 13-3: first fiber optic circulator; 13-31: fiber optic end of the first fiber optic circulator; 13-32: transmitting end of the first fiber optic circulator; 13-33: receiving end of the first fiber optic circulator; 13-4: second transceiver end; 13-5: first filter; 14-1: third transceiver end; 14-2: second collimating lens; 14-3: second fiber optic circulator; 14-31: fiber optic end of the second fiber optic circulator; 14-32: transmitting end of the second fiber optic circulator; 14-33: receiving end of the second fiber optic circulator; 14-4: fourth transceiver end; 14-5: second filter. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention fall within the protection scope of the present invention.

[0030] The following will be combined with Figures 1 - 4 Describe the compatible dual-state two-way beaconless laser communication device of the present invention.

[0031] Figure 1 It is one of the schematic structural diagrams of the compatible dual-state two-way beaconless laser communication device provided by the present invention. AsFigure 1 As shown in Figure 1 , the dual - state compatible bidirectional beaconless laser communication device 100 includes: a laser transceiver assembly, an optical transmission assembly, a first signal transceiver unit 13, a second signal transceiver unit 14, and a control unit 15.

[0032] See Figure 1 , the laser transceiver assembly may include a primary mirror 1, a secondary mirror 2, and an eyepiece 3. Among them, the primary mirror 1 and the secondary mirror 2 are oppositely arranged, the secondary mirror 2 is arranged on the reflection optical path of the primary mirror 1, and the eyepiece is arranged on the reflection optical path of the secondary mirror 2.

[0033] The laser transceiver assembly is used to reduce the beam of the laser carrying the signal and emit the reduced laser beam. This laser beam is transmitted along the first emission optical path.

[0034] In a specific implementation, the beam reduction ratio and beam expansion ratio of the laser transceiver assembly are 10 times in the wavelength range of 1500nm - 1580nm, and the surface form accuracy is less than or equal to 21nm.

[0035] In a specific implementation, the focal length of the laser transceiver assembly can be 250mm.

[0036] The optical transmission assembly is arranged on the first emission optical path, and is used to receive the laser beam emitted from the laser transceiver assembly and output the laser beam in two paths. As Figure 1 shown, one output is transmitted along the second emission optical path, and the other output is transmitted along the third emission optical path.

[0037] The first signal transceiver unit 13 is arranged on the second emission optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission assembly. The first optical receiving path and the first optical transmitting path are described in detail later, and will not be elaborated here.

[0038] The second signal transceiver unit 14 is arranged on the third emission optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission assembly. The second optical receiving path and the second optical transmitting path are described in detail later, and will not be elaborated here.

[0039] The control unit 15 is coupled to the first signal transceiver unit 13 and the second signal transceiver unit 14, and is used to control the current state to be the first state or the second state.

[0040] In the first state, the control unit 15 controls the first signal transceiver unit 13 to be a signal receiving end, and the second signal transceiver unit 14 to be a signal transmitting end. In this case, the optical receiving path is the first optical receiving path formed by the first signal transceiver unit 13 and the optical transmission assembly, and the optical transmitting path is the second optical transmitting path formed by the second signal transceiver unit 14 and the optical transmission assembly 13.

[0041] In the second state, the control unit 15 controls the first signal transceiver unit 13 to be a signal transmitter and controls the second signal transceiver unit 14 to be a signal receiver. The first signal transceiver unit 13 and the optical transmission component form a first optical transmission path, and the second signal transceiver unit 14 and the optical transmission component form a second optical reception path.

[0042] Please continue to refer to Figure 1 , the optical transmission component may include: a first fast steering mirror 4, a first beam splitter 5, a dichroic mirror 6, a second fast steering mirror 7, a narrowband switch 8, a tracking lens group 9, and a tracking detector 10.

[0043] The first fast steering mirror 4 is disposed on the first outgoing optical path, the first beam splitter 5 is disposed on the reflected optical path of the first fast steering mirror 4, the dichroic mirror 6 is disposed on the transmitted optical path of the first beam splitter 5, the second fast steering mirror 7 is disposed on the reflected optical path of the dichroic mirror 6, the tracking detector 10 is disposed on the reflected optical path of the first beam splitter 5, and the tracking detector 10 is disposed at the focal position of the tracking lens group 9; the narrowband switch 8 is disposed between the first beam splitter 5 and the tracking lens group 9.

[0044] After the laser beam emitted from the laser transceiver assembly enters the first fast steering mirror 4 in the optical transmission component, it is reflected by the first fast steering mirror 4 and enters the first beam splitter 5, is transmitted through the first beam splitter 5 and enters the narrowband switch 8, is filtered by the narrowband switch 8 and enters the tracking lens group 9, is focused by the tracking lens group 9, and enters the tracking detector 10 after focusing, thereby establishing an initial optical axis. In this case, the first fast steering mirror 4 can be feedback-adjusted through the tracking detector 10 to complete the calibration of the initial optical axis of the optical transmission component.

[0045] After the laser beam emitted from the laser transceiver assembly enters the first fast steering mirror 4 in the optical transmission component, it is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5, is transmitted through the first beam splitter 5 and then enters the dichroic mirror 6, is transmitted through the dichroic mirror 6 and then enters the first signal transceiver unit 13, thereby establishing a first optical reception path.

[0046] After the laser beam emitted from the laser transceiver assembly enters the first fast steering mirror 4 in the optical transmission component, it is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5, is transmitted through the first beam splitter 5 and then enters the dichroic mirror 6, is reflected by the dichroic mirror 6 and then enters the second fast steering mirror 7, is reflected by the second fast steering mirror 7 and then enters the second signal transceiver unit 14, thereby establishing a second optical reception path.

[0047] The first signal transceiver unit 13 can emit a first collimated beam of a first wavelength, and the second signal transceiver unit 14 can emit a second collimated beam of a second wavelength. In this case, the first signal transceiver unit 13 and the second signal transceiver unit 14 can complete the emission of optical signals.

[0048] Please continue to refer to Figure 1, the first signal transceiver unit 13 can emit a first collimated beam to the dichroic mirror 6. After the first collimated beam enters the dichroic mirror 6, it is transmitted through the dichroic mirror 6 and then enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver module, thus forming the first optical emission path.

[0049] Please continue to refer to Figure 1 , the second signal transceiver unit 14 can emit a second collimated beam to the second fast steering mirror 7. After the second collimated beam enters the second fast steering mirror 7, it is reflected by the second fast steering mirror 7 and then enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver module, thus forming the second optical emission path.

[0050] It should be noted that the operating wavelengths of the first signal transceiver unit 13 and the second signal transceiver unit 14 are different. That is, the first wavelength and the second wavelength are different.

[0051] The operating wavelength of the first signal transceiver unit 13 is the first wavelength. In this case, the first signal transceiver unit 13 can emit a first collimated beam of the first wavelength and receive a laser beam of the first wavelength.

[0052] The operating wavelength of the second signal transceiver unit 14 is the second wavelength. In this case, the second signal transceiver unit 14 can emit a second collimated beam of the second wavelength and receive a laser beam of the second wavelength.

[0053] In some embodiments, the first wavelength can be 1563 nm and the second wavelength can be 1540 nm; or, the first wavelength can be 1540 nm and the second wavelength can be 1563 nm, for example.

[0054] Based on the first optical emission path, the first optical reception path, the second optical emission path, and the second optical reception path introduced above, the specific working process of the bidirectional beaconless laser communication device 100 compatible with dual states will be introduced below.

[0055] Refer to Figure 1As shown, the current state of the compatible dual-state bidirectional beaconless laser communication device 100 can be controlled by the control unit 15 to be the first state. In the first state, the first signal transceiver unit 13 acts as a signal transmitter to emit a first collimated light beam to the dichroic mirror 6. After the first collimated light beam enters the dichroic mirror 6, it is transmitted through the dichroic mirror 6 and then enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver module and is emitted after beam expansion by the laser transceiver module, thus completing the signal transmission. The laser carrying the signal emitted from an external device enters the laser transceiver module, and after beam contraction by the laser transceiver module, a beam-contracted laser beam is obtained. After the laser beam exits the laser transceiver module and enters the first fast steering mirror 4 in the optical transmission module, it is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the second fast steering mirror 7. After being reflected by the second fast steering mirror 7, it enters the second signal transceiver unit 14 acting as a signal receiver, and the signal is received by the second signal transceiver unit 14, thus completing the signal reception. In the first state, the laser beam received by the optical transmission module is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5. Then, after being reflected by the first beam splitter 5, it enters the narrowband switch for filtering to perform wavelength screening. The light of the second wavelength (the wavelength screened here is the working wavelength of the signal receiver. In the first state, the second signal transceiver unit 14 is the signal receiver, so the screened wavelength is the second wavelength) enters the tracking lens group 9, and after being focused by the tracking lens group 9, it enters the tracking detector 10 to calibrate the initial optical axis based on the feedback of the tracking detector 10.

[0056] Please continue to refer to Figure 1As shown, the current state of the dual - state - compatible bidirectional beaconless laser communication device 100 can be controlled by the control unit 15 to be the second state. In the second state, the second signal transceiver unit 14 acts as a signal transmitter to emit a second collimated beam to the second fast steering mirror 7. After the second collimated beam enters the second fast steering mirror 7, it is reflected by the second fast steering mirror 7 and enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the first beam splitter 5. After passing through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver module, and the laser transceiver module emits the beam after beam expansion, thus completing the signal transmission. The laser carrying the signal emitted from an external device enters the laser transceiver module, and after being beam - contracted by the laser transceiver module, a beam - contracted laser beam is obtained. This laser beam exits the laser transceiver module and enters the first fast steering mirror 4 in the optical transmission module. After being reflected by the first fast steering mirror 4, it enters the first beam splitter 5. After passing through the first beam splitter 5, it enters the dichroic mirror 6. After passing through the dichroic mirror 6, it enters the first signal transceiver unit 13 acting as a signal receiver, and the signal is received by the first signal transceiver unit 13, thus completing the signal reception. In the second state, similar to the first state, the laser beam received by the optical transmission module is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5. Then, after being reflected by the first beam splitter 5, it enters the narrow - band switch for filtering to screen the wavelength. The light of the second wavelength (the wavelength screened here is the working wavelength of the signal receiver. In the first state, the second signal transceiver unit 14 is the signal receiver, so the screened wavelength is the second wavelength) enters the tracking lens group 9, and after being focused by the tracking lens group 9, it enters the tracking detector 10 to calibrate the initial optical axis based on the feedback of the tracking detector 10.

[0057] In some embodiments, as Figure 2 shown, the dual - state - compatible bidirectional beaconless laser communication device 100 may further include: an optical axis calibration component.

[0058] The optical axis calibration component includes an optical axis monitoring camera 11 and a second beam splitter 12.

[0059] The second beam splitter 12 is disposed between the first fast steering mirror 4 and the laser transceiver module, that is, between the first fast steering mirror 4 and the eyepiece 3.

[0060] The first fast steering mirror 4 is located on the transmission optical path of the second beam splitter 12, and the optical axis monitoring camera 11 is disposed on the reflection optical path of the second beam splitter 12.

[0061] See Figure 2, in the first state, the first signal transceiver unit 13 acts as a signal transmitter to emit a first collimated light beam to the dichroic mirror 6. After the first collimated light beam enters the dichroic mirror 6, it is transmitted through the dichroic mirror 6 and enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the second beam splitter 12. A part of the light transmitted through the second beam splitter 12 enters the laser transceiver module, and another part of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0062] In the second state, the second signal transceiver unit 14 acts as a signal transmitter to emit a second collimated light beam to the second fast steering mirror 7. After the second collimated light beam enters the second fast steering mirror 7, it is reflected by the second fast steering mirror 7 and enters the dichroic mirror 6. After being transmitted through the dichroic mirror 6, it enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the second beam splitter 12. A part of the light transmitted through the second beam splitter 12 enters the laser transceiver module, and another part of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0063] It can be seen that the optical axis monitoring camera 11 can receive the first collimated light beam and the second collimated light beam. In this case, the coaxiality of the optical axes in the first light receiving path and the second light receiving path can be detected through the optical axis monitoring camera 11, so as to calibrate the optical axes in the first light receiving path and the second light receiving path based on the detected results, ensuring the accuracy of the path and direction of the laser beam during transmission.

[0064] In a specific implementation, the transmittance ratio of the second beam splitter 12 can be 99:1, the surface accuracy ≤ 1 / 20λ@632.8nm, and the aperture can be 25mm. In this case, before the collimated light beam entering the first fast steering mirror 4 enters the laser transceiver module, it first enters the second beam splitter 12. After being transmitted through the second beam splitter 12, 99% of the transmitted energy enters the laser transceiver module, and 1% of the reflected energy enters the optical axis monitoring camera 11 for coaxiality detection of the optical axis.

[0065] In a specific implementation, the measurement accuracy of the optical axis monitoring camera 11 is less than 5urad, and the root mean square (RMS) of the surface accuracy ≤ 80nm.

[0066] The relevant parameters of the first fast steering mirror 4 and the second fast steering mirror 7 are selected as follows: the working wavelength range is 1550 ± 30nm, the reflectivity is greater than 98%, the angular resolution ≤ 1μrad, the angular deviation range: ±3mrad, and the surface accuracy RMS ≤ 21nm.

[0067] The transmittance ratio of the first beam splitter 5 can be 95:5, and the surface accuracy RMS ≤ 80nm.

[0068] The switching accuracy of the narrowband switch 8 is less than 0.5°, and narrowband switching between the first wavelength and the second wavelength can be performed. For example, switching between two narrowbands of 1540 nm and 1563 nm can be performed.

[0069] The measurement accuracy of the tracking lens group 9 is less than 4 μrad, and the aperture can be 20 nm.

[0070] The wavelength range measured by the tracking detector 10 is 0.4 μm to 1.7 μm.

[0071] The coating of the dichroic mirror 6 can be, for example, a 1540 nm reflective film with a reflectivity of 93%; and a 1563 nm transmissive film with a transmittance of 93%.

[0072] Next, the structures of the first signal transceiver unit 13 and the second signal transceiver unit 14 will be introduced.

[0073] As Figure 3 shown in part a, the first signal transceiver unit 13 includes a first transceiver end 13-1, a first collimating lens 13-2, a first fiber optic circulator 13-3, and a second transceiver end 13-4.

[0074] The first collimating lens 13-2 is disposed between the first transceiver end 13-1 and the first fiber optic circulator 13-3. The fiber end 13-31 of the first fiber optic circulator 13-3 is disposed at the focal position of the first collimating mirror 13-2. The transmitting end 13-32 of the first fiber optic circulator 13-3 is used to transmit the first collimated light beam of the first wavelength. The receiving end 13-33 of the first fiber optic circulator 13-3 is coupled to the second transceiver end 13-4, and the receiving end 13-33 of the first fiber optic circulator 13-3 is used to receive the laser beam of the first wavelength.

[0075] As Figure 3 shown in part b, the second signal transceiver unit 14 includes a third transceiver end 14-1, a second collimating lens 14-2, a second fiber optic circulator 14-3, and a fourth transceiver end 14-4.

[0076] The second collimating lens 14-2 is disposed between the third transceiver end 14-1 and the second fiber optic circulator 14-3.

[0077] The fiber end 14-31 of the second fiber optic circulator 14-3 is disposed at the focal position of the second collimating lens 14-2. The transmitting end 14-32 of the second fiber optic circulator 14-3 is used to transmit the second collimated light beam of the second wavelength. The receiving end 14-33 of the second fiber optic circulator 14-3 is coupled to the fourth transceiver end 14-4, and the receiving end 14-33 of the second fiber optic circulator 14-3 is used to receive the laser beam of the second wavelength.

[0078] In specific implementation, the transmitting end 13-32 of the first optical fiber circulator 13-3 is used to transmit a collimated beam of 1563 nm, and the receiving end 13-33 of the first optical fiber circulator 13-3 is used to receive a laser beam of 1563 nm. The transmitting end 14-32 of the second optical fiber circulator 14-3 is used to transmit a collimated beam of 1540 nm, and the receiving end 14-33 of the second optical fiber circulator 14-3 is used to receive a laser beam of 1540 nm.

[0079] In some embodiments, as Figure 4 shown in part a, the first signal receiver 13 further includes: a first filter 13-5, and the first filter 13-5 is connected to the receiving end 13-33 of the first optical fiber circulator 13-3 and the second transceiver 13-4.

[0080] As Figure 4 shown in part b, the second signal receiver 14 further includes: a second filter 14-5, and the second filter 14-5 is connected to the receiving end 14-33 of the first optical fiber circulator 14-3 and the fourth transceiver 14-4.

[0081] The first filter 13-5 and the second filter 14-5 can be notch filters.

[0082] Based on the above-introduced bidirectional beaconless laser communication device with compatible dual states, the following beneficial effects can be achieved: 1. High integration, relatively low effective cost, and reduced overall volume; 2. The design of compatible dual states can meet the requirement of high coaxiality for bidirectional beaconless laser communication in a dual-channel, and has an optical axis alignment function to ensure optical axis coaxiality; 3. A low-cost narrowband switch is used to achieve narrowband switching, further reducing the cost.

[0083] The two-way beaconless laser communication device compatible with dual states provided by the present invention includes a laser transceiver assembly, an optical transmission assembly, a first signal transceiver unit, a second signal transceiver unit, and a control unit. The laser transceiver assembly is used to condense the laser carrying a signal and emit the condensed laser beam; the laser beam is transmitted along a first emission optical path; the optical transmission assembly is arranged on the first emission optical path and is used to receive the laser beam and output it in two paths; wherein, one output is transmitted along a second emission optical path, and the other output is transmitted along a third emission optical path; the first signal transceiver unit is arranged on the second emission optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission assembly; the second signal transceiver unit is arranged on the third emission optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission assembly; the control unit is coupled to the first signal transceiver unit and the second signal transceiver unit and is used to control the current state to be the first state or the second state; in the first state, the control unit controls the first signal transceiver unit to be a signal receiving end and controls the second signal transceiver unit to be a signal transmitting end, so that the first signal transceiver unit and the optical transmission assembly form a first optical receiving path, and the second signal transceiver unit and the optical transmission assembly form a second optical transmitting path; in the second state, the control unit controls the first signal transceiver unit to be a signal transmitting end and controls the second signal transceiver unit to be a signal receiving end, so that the first signal transceiver unit and the optical transmission assembly form a first optical transmitting path, and the second signal transceiver unit and the optical transmission assembly form a second optical receiving path; the working wavelengths of the first signal transceiver unit and the second signal transceiver unit are different. It can be seen that the present invention can realize two-way beaconless laser communication in two dual states based on one optical transmission assembly, with high integration, which makes the device smaller in volume, simpler in overall design, can effectively reduce production costs, and at the same time can ensure the accuracy of two-way beaconless laser communication, effectively solving the problem in the prior art that the integration of multi-channel two-way beaconless laser communication devices is relatively low, resulting in a larger volume and higher cost, and achieving the purpose of improving the integration of two-way beaconless laser communication devices, reducing the volume of two-way beaconless laser communication devices and reducing production costs.

[0084] The two-way beaconless laser communication method compatible with dual states provided by the present invention will be described below. The two-way beaconless laser communication method compatible with dual states described below can be correspondingly referred to the two-way beaconless laser communication device compatible with dual states described above.

[0085] Figure 5 It is a schematic flowchart of the two-way beaconless laser communication method compatible with dual states provided by the present invention. The two-way beaconless laser communication method compatible with dual states is applied to any of the two-way beaconless laser communication devices compatible with dual states introduced above.

[0086] As Figure 5As shown, the bidirectional beaconless laser communication method compatible with dual states may include the following S510 to S530.

[0087] S510: Transmit a laser to a laser transceiver assembly, perform beam reduction on the laser through the laser transceiver assembly to obtain a beam-reduced laser beam, and transmit the laser beam to an optical transmission assembly through the laser transceiver assembly.

[0088] S520: Set the current state to the first state; in the case of the first state, establish a first optical reception path based on the optical transmission assembly and the first signal transceiver unit; and establish a second optical transmission path based on the optical transmission assembly and the second signal transceiver unit. S530: Set the current state to the second state; in the case of the second state, establish a second optical reception path based on the optical transmission assembly and the second signal transceiver unit; and establish a first optical transmission path based on the optical transmission assembly and the first signal transceiver unit.

[0089] In some embodiments, the optical transmission assembly includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector. Establishing the first optical reception path based on the optical transmission assembly and the first signal transceiver unit includes: reflecting the laser beam through the first beam splitter into the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; the first laser beam is reflected through the first beam splitter into the narrowband switch, enters the tracking lens group through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis. The second laser beam passes through the first beam splitter and enters the dichroic mirror, passes through the dichroic mirror and enters the first signal transceiver unit to complete the establishment of the first optical reception path. Establishing the second optical transmission path based on the optical transmission assembly and the second signal transceiver unit includes: the second signal transceiver unit emits a first collimated beam carrying a signal, the first collimated beam is reflected by the second fast steering mirror and then enters the dichroic mirror, passes through the dichroic mirror and then enters the first beam splitter, passes through the first beam splitter and then enters the first fast steering mirror, and is reflected by the first fast steering mirror and then enters the laser transceiver assembly to complete the establishment of the second optical transmission path.

[0090] In some embodiments, a second optical receiving path is established based on an optical transmission component and a second signal transceiver unit, including: reflecting a laser beam through a first beam splitter into the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; the first laser beam is reflected through the first beam splitter into a narrowband switch, enters a tracking lens group through the narrowband switch, and is coupled to a tracking detector through the tracking lens group to establish a tracking optical axis; the second laser beam passes through the first beam splitter and enters a dichroic mirror, is reflected by the dichroic mirror into a second fast steering mirror, and is reflected by the second fast steering mirror into the second signal transceiver unit to complete the establishment of the second optical receiving path; a first optical transmitting path is established based on the optical transmission component and the first signal transceiver unit, including: the first signal transceiver unit emits a second collimated beam carrying a signal, the second collimated beam passes through the dichroic mirror and enters the first beam splitter, passes through the first beam splitter and enters the first fast steering mirror, and is reflected by the first fast steering mirror into the laser transceiver component to complete the establishment of the first optical transmitting path.

[0091] The compatible dual-state bidirectional beaconless laser communication method provided by the present invention includes emitting a laser to a laser transceiver component, reducing the beam of the laser through the laser transceiver component to obtain a reduced laser beam, and emitting the laser beam to an optical transmission component through the laser transceiver component; setting the current state to the first state; in the case of the first state, establishing a first optical receiving path based on the optical transmission component and the first signal transceiver unit; and establishing a second optical transmitting path based on the optical transmission component and the second signal transceiver unit; setting the current state to the second state; in the case of the second state, establishing a second optical receiving path based on the optical transmission component and the second signal transceiver unit; and establishing a first optical transmitting path based on the optical transmission component and the first signal transceiver unit. Thus, it can be seen that the present invention can achieve two dual-state bidirectional beaconless laser communications based on one optical transmission component, with high integration, which makes the device smaller in size, simpler in overall design, can effectively reduce production costs, and at the same time can ensure the accuracy of bidirectional beaconless laser communication, effectively solving the problem in the prior art that the multi-channel bidirectional beaconless laser communication device has a low integration degree, resulting in a large size and high cost, and achieving the purpose of improving the integration degree of the bidirectional beaconless laser communication device, reducing the size of the bidirectional beaconless laser communication device and reducing production costs.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-state compatible two-way beaconless laser communication device, characterized in that, Comprising: A laser transceiver component for beam shrinking the laser carrying a signal and emitting the beam-shrunk laser beam; The laser beam is transmitted along a first emission optical path; An optical transmission component is arranged on the first emission optical path for receiving the laser beam and outputting it in two paths; wherein, one output is transmitted along a second emission optical path and the other output is transmitted along a third emission optical path; A first signal transceiver unit is arranged on the second emission optical path for forming a first optical receiving path or a first optical transmitting path with the optical transmission component; A second signal transceiver unit is arranged on the third emission optical path for forming a second optical receiving path or a second optical transmitting path with the optical transmission component; A control unit is coupled to the first signal transceiver unit and the second signal transceiver unit for controlling the current state to be a first state or a second state; in the first state, the control unit controls the first signal transceiver unit to be a signal receiving end and controls the second signal transceiver unit to be a signal transmitting end, so that the first signal transceiver unit and the optical transmission component form the first optical receiving path, and the second signal transceiver unit and the optical transmission component form the second optical transmitting path; in the second state, the control unit controls the first signal transceiver unit to be a signal transmitting end and controls the second signal transceiver unit to be a signal receiving end, so that the first signal transceiver unit and the optical transmission component form the first optical transmitting path, and the second signal transceiver unit and the optical transmission component form the second optical receiving path; the working wavelengths of the first signal transceiver unit and the second signal transceiver unit are different.

2. The bidirectional beaconless laser communication device compatible with dual states according to claim 1, wherein The optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group and a tracking detector; The first fast steering mirror is arranged on the first emission optical path, the first beam splitter is arranged on the reflection optical path of the first fast steering mirror, the dichroic mirror is arranged on the transmission optical path of the first beam splitter, and the second fast steering mirror is arranged on the reflection optical path of the dichroic mirror; The tracking detector is arranged on the reflection optical path of the first beam splitter, the tracking detector is arranged at the focal position of the tracking detector, and the narrowband switch is arranged between the first beam splitter and the tracking lens group.

3. The compatible dual-state bidirectional beaconless laser communication device according to claim 1 or 2, characterized in that, Further comprising: An optical axis alignment component; The optical axis alignment component includes an optical axis monitoring camera and a second beam splitter; The second beam splitter is arranged between the first fast steering mirror and the laser transceiver component, the first fast steering mirror is located on the transmission optical path of the second beam splitter, and the optical axis monitoring camera is arranged on the reflection optical path of the second beam splitter.

4. The two-way beaconless laser communication device compatible with dual states according to claim 3, characterized in that, The transmission ratio of the second beam splitter is 99:

1.

5. The dual-state compatible two-way beaconless laser communication device according to claim 1, characterized in that The first signal transceiver unit includes a first transceiver end, a second transceiver end, a first collimating lens and a first fiber optic circulator; The first collimating lens is arranged between the first transceiver end and the first fiber optic circulator; The optical fiber end of the first optical fiber circulator is arranged at the focal position of the first collimator, the transmitting end of the first optical fiber circulator is used to transmit the first collimated light beam of the first wavelength, the receiving end of the first optical fiber circulator is coupled with the second transmitting and receiving end, and the receiving end of the first optical fiber circulator is used to receive the laser beam of the first wavelength; The second signal transceiver unit includes a third transceiver end, a fourth transceiver end, a second collimating lens and a second optical fiber circulator; The second collimating lens is arranged between the third transceiver end and the second optical fiber circulator; The optical fiber end of the second optical fiber circulator is arranged at the focal position of the second collimating lens, the transmitting end of the second optical fiber circulator is used to transmit the second collimated light beam of the second wavelength, the receiving end of the second optical fiber circulator is coupled to the fourth transmitting and receiving end, and the receiving end of the second optical fiber circulator is used to receive the laser beam of the second wavelength.

6. The bidirectional beaconless laser communication device compatible with dual states according to claim 5, wherein, The first signal receiver further includes: a first filter, the first filter connecting the receiving end of the first optical fiber circulator and the second transceiver end; The second signal receiver further includes: a second filter, and the second filter is connected to the receiving end of the second optical fiber circulator and the fourth transceiver end.

7. The dual-state compatible two-way beaconless laser communication device according to claim 1, characterized in that The laser transceiver assembly includes a primary mirror, a secondary mirror and an eyepiece; The primary mirror and the secondary mirror are arranged opposite to each other, the secondary mirror is arranged on the reflected light path of the primary mirror, and the eyepiece is arranged on the reflected light path of the secondary mirror.

8. A two-way beaconless laser communication method compatible with dual states, applied to the two-way beaconless laser communication device compatible with dual states according to any one of claims 1-7, characterized in that, include: The laser is emitted to a laser transceiver assembly, the laser is beam-contracted by the laser transceiver assembly to obtain a beam-contracted laser beam, and the laser beam is emitted to an optical transmission assembly by the laser transceiver assembly; Set the current state to the first state; In the case of the first state, a first optical receiving path is established based on the optical transmission component and the first signal transceiver unit; And, based on the optical transmission component and the second signal transceiver unit, a second optical transmission path is established; Alternatively, set the current state to the second state; In the case of the second state, a second optical receiving path is established based on the optical transmission component and the second signal transceiver unit; And, based on the optical transmission component and the first signal transceiver unit, a first optical transmission path is established.

9. The bidirectional beaconless laser communication method compatible with dual states according to claim 8, wherein, The optical transmission assembly includes a first fast-reflection mirror, a first beam splitter, a color-dividing mirror, a second fast-reflection mirror, a narrow-band switch, a tracking lens group, and a tracking detector; The first optical receiving path is established based on the optical transmission component and the first signal transceiver unit, including: reflecting the laser beam through the first beam splitter and entering the first beam splitter, and the first beam splitter splits the laser beam into a first laser beam and a second laser beam; The first laser beam is reflected by the first beam splitter and enters the narrowband switch, enters the tracking lens group through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis; The second laser beam is transmitted through the first beam splitter into the dichroic mirror, and is transmitted through the dichroic mirror into the first signal transceiver unit, thereby completing the establishment of the first light receiving path; Based on the optical transmission component and the second signal transceiver unit, a second optical emission path is established, including: the second signal transceiver unit emits a first collimated light beam carrying a signal, the first collimated light beam enters the dichroic mirror after being reflected by the second fast steering mirror, enters the first beam splitter after passing through the dichroic mirror, enters the first fast steering mirror after passing through the first beam splitter, and enters the laser transceiver component after being reflected by the first fast steering mirror, thus completing the establishment of the second optical emission path.

10. The two-way beaconless laser communication method compatible with dual states according to claim 8, characterized in that, The optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector; Based on the optical transmission component and the second signal transceiver unit, a second optical reception path is established, including: the laser beam enters the first beam splitter after being reflected by the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; The first laser beam enters the narrowband switch after being reflected by the first beam splitter, enters the tracking lens group after passing through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis; The second laser beam enters the dichroic mirror after passing through the first beam splitter, enters the second fast steering mirror after being reflected by the dichroic mirror, and enters the second signal transceiver unit after being reflected by the second fast steering mirror, thus completing the establishment of the second optical reception path; Based on the optical transmission component and the first signal transceiver unit, a first optical emission path is established, including: the first signal transceiver unit emits a second collimated light beam carrying a signal, the second collimated light beam enters the first beam splitter after passing through the dichroic mirror, enters the first fast steering mirror after passing through the first beam splitter, and enters the laser transceiver component after being reflected by the first fast steering mirror, thus completing the establishment of the first optical emission path.

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