Bidirectional beaconless laser communication device and method compatible with dual states

Abstract

This invention provides a bidirectional, beacon-free laser communication device and method compatible with dual states, relating to the field of laser communication technology. The device includes: a laser transceiver assembly for beam-reducing a signal-carrying laser beam and emitting the reduced beam along a first output optical path; an optical transmission assembly disposed on the first output optical path, receiving the laser beam and splitting it into two outputs; one output is transmitted along a second output optical path, and the other output is transmitted along a third output optical path; a first signal transceiver unit and a second signal transceiver unit are disposed on the transmission optical paths of the two outputs; and a control unit for controlling the current state to be either the first state or the second state; in the first state, the first signal transceiver unit is a signal receiver and the second signal transceiver unit is a signal transmitter; in the second state, the first signal transceiver unit is a signal transmitter and the second signal transceiver unit is a signal receiver. This invention can reduce the size of the bidirectional, beacon-free laser communication device and lower production costs.

Description

Technical Field

[0001] This invention relates to the field of laser communication technology, and in particular to a bidirectional beaconless laser communication device and method compatible with dual states. Background Technology

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

[0003] With the increasing demand for internet connectivity, higher and higher requirements are being placed on the data transmission volume and speed of laser communication. Currently, most laser communication is based on fiber optic networks. However, fiber optic networks require the laying of optical cables, which are expensive, resulting in high costs for laser communication based on fiber optic networks, and there is also the risk of cable damage. To meet the increasing demand for laser communication, multi-channel bidirectional beaconless laser communication devices have emerged. However, current multi-channel bidirectional beaconless laser communication devices have low integration, resulting in large size and high production costs. Summary of the Invention

[0004] This invention provides a bidirectional beaconless laser communication device and method compatible with dual states, which solves the defects of existing multi-channel bidirectional beaconless laser communication devices, which have low integration, resulting in large size and high cost. It aims to improve the integration of bidirectional beaconless laser communication devices, reduce the size of bidirectional beaconless laser communication devices, and reduce production costs.

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

[0006] A laser transceiver assembly is used to reduce the laser beam carrying the signal to a smaller beam and output the reduced laser beam; the laser beam is transmitted along a first output optical path.

[0007] An optical transmission component is disposed on the first outgoing optical path to receive a laser beam and then output the laser beam in two paths; one output is transmitted along the second outgoing optical path and the other output is transmitted along the third outgoing optical path.

[0008] The first signal transceiver unit is disposed on the second outgoing optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission component.

[0009] The second signal transceiver unit is located on the third outgoing optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission component.

[0010] The control unit, coupled to the first and second signal transceiver units, is used to control the current state to be either the first or the second state. In the first state, the control unit controls the first signal transceiver unit to be a signal receiver and the second signal transceiver unit to be a signal transmitter, 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 transmitter and the second signal transceiver unit to be a signal receiver, 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 first and second signal transceiver units operate at different wavelengths.

[0011] According to the present invention, a dual-state compatible bidirectional beaconless laser communication device is provided, wherein the optical transmission component includes a first fast reflector, a first beam splitter, a dichroic mirror, a second fast reflector, a narrowband switcher, a tracking lens group, and a tracking detector; the first fast reflector is disposed on the first outgoing optical path, the first beam splitter is disposed on the reflected optical path of the first fast reflector, the dichroic mirror is disposed on the transmitted optical path of the first beam splitter, and the second fast reflector 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 and is located at the focal point of the tracking detector; the narrowband switcher is disposed between the first beam splitter and the tracking lens group.

[0012] According to the present invention, a bidirectional beaconless laser communication device compatible with dual states is provided, 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 disposed between a first fast reflector and a laser transceiver component, the first fast reflector is located on the transmission optical path of the second beam splitter, and the optical axis monitoring camera is disposed on the reflection optical path of the second beam splitter.

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

[0014] According to the present invention, a bidirectional beaconless laser communication device compatible with dual states is provided. A 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 disposed between the first transceiver end and the first fiber optic circulator. The fiber end of the first fiber optic circulator is located at the focal point of the first collimating lens. The transmitting end of the first fiber optic circulator is used to emit a first collimated beam of a first wavelength. The receiving end of the first fiber optic circulator is coupled to the second transceiver end and is used to receive a laser beam of the first wavelength. A second signal transceiver unit includes a third transceiver end, a fourth transceiver end, a second collimating lens, and a second fiber optic circulator. The second collimating lens is disposed between the third transceiver end and the second fiber optic circulator. The fiber end of the second fiber optic circulator is located at the focal point of the second collimating lens. The transmitting end of the second fiber optic circulator is used to emit a second collimated beam of a second wavelength. The receiving end of the second fiber optic circulator is coupled to the fourth transceiver end and is used to receive a laser beam of the second wavelength.

[0015] According to the present invention, a bidirectional beaconless laser communication device compatible with dual states is provided, wherein the first signal receiver further includes: a first filter, the first filter being connected to the receiving end and the second transceiver end of a first fiber optic circulator; and the second signal receiver further includes: a second filter, the second filter being connected to the receiving end and the fourth transceiver end of a second fiber optic circulator.

[0016] According to the present invention, a dual-state compatible bidirectional beaconless laser communication device is provided, wherein 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 beaconless laser communication, applicable to any of the dual-state compatible bidirectional beaconless laser communication devices described above, the method comprising the following steps.

[0018] A laser beam is emitted to a laser transceiver unit, which then performs beam reduction on the laser beam to obtain a reduced laser beam. This reduced laser beam is then emitted to an optical transmission unit via the same transceiver unit. The current state is set to a first state. In the first state, a first optical receiving path is established based on the optical transmission unit and a first signal transceiver unit. A second optical transmitting path is also established based on the optical transmission unit and a second signal transceiver unit. Alternatively, the current state is set to a second state. In the second state, a second optical receiving path is established based on the optical transmission unit and the second signal transceiver unit. A first optical transmitting path is also established based on the optical transmission unit and the first signal transceiver unit.

[0019] According to the present invention, a bidirectional beaconless laser communication method compatible with dual states is provided. The optical transmission component includes a first fast reflector, a first beam splitter, a dichroic mirror, a second fast reflector, a narrowband switcher, a tracking lens group, and a tracking detector. Based on the optical transmission component and a 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, the first beam splitter splitting the laser beam into a first laser beam and a second laser beam; the first laser beam being reflected by the first beam splitter into the narrowband switcher, then into the tracking lens group, and coupled to a tracking detector via the tracking lens group. The detector establishes a tracking optical axis; the second laser beam is transmitted through the first beam splitter into the dichroic mirror, and then through the dichroic mirror into the first signal transceiver unit, thus establishing 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 emitting a first collimated beam carrying a signal, the first collimated beam being reflected by the second fast reflector and then entering the dichroic mirror, being transmitted through the dichroic mirror into the first beam splitter, being transmitted through the first beam splitter into the first fast reflector, and being reflected by the first fast reflector into the laser transceiver component, thus establishing the second optical transmitting path.

[0020] According to the present invention, a bidirectional beaconless laser communication method compatible with dual states is provided. The optical transmission component includes a first fast reflector, a first beam splitter, a dichroic mirror, a second fast reflector, a narrowband switcher, a tracking lens group, and a tracking detector. Based on the optical transmission component and a 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, the first beam splitter splitting the laser beam into a first laser beam and a second laser beam; the first laser beam being reflected by the first beam splitter into the narrowband switcher, then into the tracking lens group, and coupled to a tracking detector via the tracking lens group. The detector establishes a tracking optical axis; the second laser beam is transmitted through the first beam splitter into the dichroic mirror, reflected by the dichroic mirror into the second fast-reflecting mirror, and reflected by the second fast-reflecting mirror into the second signal transceiver unit, thus establishing the second optical receiving path; based on the optical transmission component and the first signal transceiver unit, the 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 into the first beam splitter, transmitted through the first beam splitter into the first fast-reflecting mirror, and reflected by the first fast-reflecting mirror into the laser transceiver component, thus establishing the first optical transmitting path.

[0021] The present invention provides a bidirectional, beacon-free laser communication device and method compatible with dual states, comprising a laser transceiver component, an optical transmission component, a first signal transceiver unit, a second signal transceiver unit, and a control unit. The laser transceiver component is used to reduce the laser beam carrying a signal and emit the reduced laser beam; the laser beam is transmitted along a first output optical path. The optical transmission component, disposed on the first output optical path, is used to receive the laser beam and split it into two outputs; one output is transmitted along a second output optical path, and the other output is transmitted along a third output optical path. The first signal transceiver unit, disposed on the second output optical path, is used to form a first optical receiving path or a first optical transmitting path with the optical transmission component. The second signal transceiver unit, disposed on the third output optical path, is used to form a second optical receiving path or a second optical transmitting path with the optical transmission component. The control unit, coupled to the first and second signal transceiver units, is used for... The control unit controls the current state to either a first state or a second state. In the first state, the control unit controls the first signal transceiver unit as a signal receiver and the second signal transceiver unit as a signal transmitter, 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 as a signal transmitter and the second signal transceiver unit as a signal receiver, 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 operating wavelengths of the first signal transceiver unit and the second signal transceiver unit are different. Therefore, this invention can realize two dual-state bidirectional beaconless laser communication based on a single optical transmission component. It has a high degree of integration, resulting in a smaller device size and a simpler overall design, which can effectively reduce production costs. At the same time, it can also ensure the accuracy of bidirectional beaconless laser communication. It effectively solves the problem that the low integration of existing multi-channel bidirectional beaconless laser communication devices leads to large size and high cost. It achieves the goal of improving the integration of bidirectional beaconless laser communication devices, reducing the size of bidirectional beaconless laser communication devices, and reducing production costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is one of the structural schematic diagrams of the bidirectional beaconless laser communication device compatible with dual states provided by the present invention.

[0024] Figure 2This is the second schematic diagram of the structure of the bidirectional beaconless laser communication device compatible with dual states provided by the present invention.

[0025] Figure 3 This is one of the structural schematic diagrams of the first signal transceiver unit and the second signal transceiver unit in the bidirectional beaconless laser communication device compatible with dual states provided by the present invention.

[0026] Figure 4 This is the second schematic diagram of the structure of the first signal transceiver unit and the second signal transceiver unit in the bidirectional beaconless laser communication device compatible with dual states provided by the present invention.

[0027] Figure 5 This is a flowchart illustrating the bidirectional beaconless laser communication method compatible with dual states provided by the present invention.

[0028] Figure label:

[0029] 1: Primary mirror; 2: Secondary mirror; 3: Eyepiece; 4: First fast-reflecting mirror; 5: First beam splitter; 6: Dichroic mirror; 7: Second fast-reflecting mirror; 8: Narrowband switcher; 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: Optical fiber circulator of the first fiber optic circulator Fiber end; 13-32: Transmitter end of the first fiber optic circulator; 13-33: Receiver 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 end of the second fiber optic circulator; 14-32: Transmitter end of the second fiber optic circulator; 14-33: Receiver end of the second fiber optic circulator; 14-4: Fourth transceiver end; 14-5: Second filter. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] The following is combined with Figures 1-4 This invention describes a bidirectional, beacon-free laser communication device compatible with dual states.

[0032] Figure 1This is one of the structural schematic diagrams of the bidirectional beaconless laser communication device compatible with dual states provided by the present invention. For example... Figure 1 As shown, 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.

[0033] See Figure 1 The laser transceiver assembly may include a primary mirror 1, a secondary mirror 2, and an eyepiece 3. The primary mirror 1 and the secondary mirror 2 are arranged opposite each other, with the secondary mirror 2 positioned on the reflected light path of the primary mirror 1 and the eyepiece positioned on the reflected light path of the secondary mirror 2.

[0034] The laser transceiver assembly is used to reduce the laser beam carrying the signal, and then outputs the reduced laser beam. This laser beam is transmitted along the first output optical path.

[0035] In practice, the beam shrinkage and beam expansion ratios of the laser transceiver components are 10 times within the wavelength range of 1500nm~1580nm, and the surface accuracy is less than or equal to 21nm.

[0036] In practice, the focal length of the laser transceiver assembly can be 250mm.

[0037] An optical transmission component is positioned on the first outgoing optical path to receive the laser beam emitted from the laser transceiver component and output the laser beam in two paths. For example... Figure 1 As shown, one output is transmitted along the second outgoing optical path, and the other output is transmitted along the third outgoing optical path.

[0038] The first signal transceiver unit 13 is disposed on the second outgoing optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission component. The first optical receiving path and the first optical transmitting path are described in detail later, and will not be described in detail here.

[0039] The second signal transceiver unit 14 is disposed on the third outgoing optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission component. The details of the second optical receiving path and the second optical transmitting path will be described later and will not be elaborated here.

[0040] 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.

[0041] In the first state, the control unit 15 controls the first signal transceiver unit 13 as a signal receiver and the second signal transceiver unit 14 as a signal transmitter. In this case, the optical receiving path is composed of the first signal transceiver unit 13 and the optical transmission component, and the optical transmitting path is composed of the second signal transceiver unit 14 and the optical transmission component 13.

[0042] In the second state, the control unit 15 controls the first signal transceiver unit 13 as a signal transmitter and controls the second signal transceiver unit 14 as a signal receiver. The first signal transceiver unit 13 and the optical transmission component constitute the first optical transmission path, and the second signal transceiver unit 14 and the optical transmission component constitute the second optical receiving path.

[0043] Please continue reading Figure 1 The optical transmission components may include: a first fast-reflecting mirror 4, a first beam splitter 5, a dichroic mirror 6, a second fast-reflecting mirror 7, a narrowband switcher 8, a tracking lens group 9, and a tracking detector 10.

[0044] The first fast-reflecting mirror 4 is disposed on the first outgoing light path, the first beam splitter 5 is disposed on the reflected light path of the first fast-reflecting mirror 4, the dichroic mirror 6 is disposed on the transmitted light path of the first beam splitter 5, the second fast-reflecting mirror 7 is disposed on the reflected light path of the dichroic mirror 6, the tracking detector 10 is disposed on the reflected light 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 switcher 8 is disposed between the first beam splitter 5 and the tracking lens group 9.

[0045] The laser beam emitted from the laser transceiver unit enters the first fast-reflecting mirror 4 in the optical transmission unit, is reflected by the first fast-reflecting mirror 4, enters the first beam splitter 5, is transmitted through the first beam splitter 5, enters the narrowband switcher 8, is filtered by the narrowband switcher 8, and then enters the tracking lens group 9. The tracking lens group 9 focuses the beam, and after focusing, it enters the tracking detector 10, thus establishing the initial optical axis. In this case, the tracking detector 10 can provide feedback adjustment to the first fast-reflecting mirror 4, completing the calibration of the initial optical axis of the optical transmission unit.

[0046] The laser beam emitted from the laser transceiver unit enters the first fast reflector 4 in the optical transmission unit, is reflected by the first fast reflector 4, enters the first beam splitter 5, is transmitted through the first beam splitter 5, enters the dichroic mirror 6, and is transmitted through the dichroic mirror 6 into the first signal transceiver unit 13, thereby establishing the first optical receiving path.

[0047] The laser beam emitted from the laser transceiver unit enters the first fast reflector 4 in the optical transmission unit, is reflected by the first fast reflector 4, enters the first beam splitter 5, is transmitted through the first beam splitter 5, enters the dichroic mirror 6, is reflected by the dichroic mirror 6, enters the second fast reflector 7, and is reflected by the second fast reflector 7 into the second signal transceiver unit 14, thereby establishing the second optical receiving path.

[0048] 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 transmission of optical signals.

[0049] Please continue reading Figure 1 The first signal transceiver unit 13 can emit a first collimated beam to the dichroic mirror 6. After entering the dichroic mirror 6, the first collimated beam 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 reflector 4 and is reflected by the first fast reflector 4 before entering the laser transceiver assembly, thus forming the first optical emission path.

[0050] Please continue reading Figure 1 The second signal transceiver unit 14 can emit a second collimated beam to the second fast reflector 7. After entering the second fast reflector 7, the second collimated beam is reflected by the second fast reflector 7 and 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 reflector 4. After being reflected by the first fast reflector 4, it enters the laser transceiver assembly, thus forming the second optical emission path.

[0051] It should be noted that the first signal transceiver unit 13 and the second signal transceiver unit 14 operate at different wavelengths. That is, the first wavelength and the second wavelength are different.

[0052] 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.

[0053] The second signal transceiver unit 14 operates at a second wavelength. In this case, the second signal transceiver unit 14 can transmit a second collimated beam of the second wavelength and receive a laser beam of the second wavelength.

[0054] In some embodiments, the first wavelength may be 1563 nm and the second wavelength may be 1540 nm; or, the first wavelength may be 1540 nm and the second wavelength may be, for example, 1563 nm.

[0055] Based on the first optical transmitting path, the first optical receiving path, the second optical transmitting path, and the second optical receiving path described above, the specific working process of the bidirectional beaconless laser communication device 100 compatible with dual states will be described below.

[0056] See 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 first state. In the first state, the first signal transceiver unit 13, as the signal transmitter, emits a first collimated beam to the dichroic mirror 6. After entering the dichroic mirror 6, the first collimated beam 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-reflecting mirror 4. After being reflected by the first fast-reflecting mirror 4, it enters the laser transceiver assembly, which expands the beam and emits it, thereby completing the signal transmission. From the external device... The laser beam carrying the signal to be emitted enters the laser transceiver assembly. After being beam-contracted by the laser transceiver assembly, a constricted laser beam is obtained. This laser beam exits the laser transceiver assembly and enters the first fast reflector 4 in the optical transmission assembly. After being reflected by the first fast reflector 4, it 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 reflector 7. After being reflected by the second fast reflector 7, it enters the second signal transceiver unit 14, which serves as the signal receiver. The second signal transceiver unit 14 receives the signal, thus completing the signal reception. In the first state, the laser beam received by the optical transmission assembly enters the first beam splitter 5 after being reflected by the first fast reflector 4. Then, after being reflected by the first beam splitter 5, the light enters the narrowband switch for filtering to select the wavelength. The second wavelength of light (the wavelength selected 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 selected wavelength is the second wavelength) enters the tracking lens group 9. After being focused by the tracking lens group 9, it enters the tracking detector 10 so that the initial optical axis can be calibrated based on the feedback of the tracking detector 10.

[0057] Please continue reading 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, as the signal transmitter, emits a second collimated beam to the second fast-reflecting mirror 7. After entering the second fast-reflecting mirror 7, the second collimated beam is reflected by the second fast-reflecting mirror 7 and 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-reflecting mirror 4. After being reflected by the first fast-reflecting mirror 4, it enters the laser transceiver assembly. The laser transceiver assembly... The laser beam is expanded and emitted, thus completing the signal transmission. The laser carrying the signal emitted from the external device enters the laser transceiver assembly, and after being narrowed by the laser transceiver assembly, a narrowed laser beam is obtained. This laser beam exits the laser transceiver assembly and enters the first fast reflector 4 in the optical transmission assembly. After being reflected by the first fast reflector 4, it enters the first beam splitter 5, is transmitted through the first beam splitter 5, enters the dichroic mirror 6, and is transmitted through the dichroic mirror 6 before entering the first signal transceiver unit 13, which serves as the signal receiving end. The first signal transceiver unit 13 receives the signal, thus completing the signal reception. In the second state, similar to the first state, the laser beam received by the optical transmission assembly is reflected by the first fast reflector 4 and enters the first beam splitter 5. Then, after being reflected by the first beam splitter 5, the light enters the narrowband switch for filtering to select the wavelength. The second wavelength of light (the wavelength selected 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 selected wavelength is the second wavelength) enters the tracking lens group 9. After being focused by the tracking lens group 9, it enters the tracking detector 10 so that the initial optical axis can be calibrated based on the feedback of the tracking detector 10.

[0058] In some embodiments, such as Figure 2 As shown, the dual-state compatible bidirectional beaconless laser communication device 100 may further include: an optical axis alignment component.

[0059] The optical axis alignment assembly includes an optical axis monitoring camera 11 and a second beam splitter 12.

[0060] The second beam splitter 12 is positioned between the first fast mirror 4 and the laser transceiver assembly, that is, between the first fast mirror 4 and the eyepiece 3.

[0061] The first fast-reflecting mirror 4 is located on the transmission light path of the second beam splitter 12, and the optical axis monitoring camera 11 is set on the reflection light path of the second beam splitter 12.

[0062] See Figure 2In the first state, the first signal transceiver unit 13, acting as a signal transmitter, emits a first collimated beam to the dichroic mirror 6. After entering the dichroic mirror 6, the first collimated beam 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-reflecting mirror 4. After being reflected by the first fast-reflecting mirror 4, it enters the second beam splitter 12. A portion of the light transmitted through the second beam splitter 12 enters the laser transceiver assembly, and another portion of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0063] In the second state, the second signal transceiver unit 14, acting as a signal transmitter, emits a second collimated beam to the second fast reflector 7. After entering the second fast reflector 7, the second collimated beam is reflected by the second fast reflector 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 reflector 4. After being reflected by the first fast reflector 4, it enters the second beam splitter 12. A portion of the light transmitted through the second beam splitter 12 enters the laser transceiver assembly, and another portion of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0064] Therefore, the optical axis monitoring camera 11 can receive the first collimated beam and the second collimated beam. In this case, the optical axis monitoring camera 11 can detect the coaxiality of the optical axes in the first optical receiving path and the second optical receiving path, so as to calibrate the optical axes in the first optical receiving path and the second optical receiving path based on the detection results, and ensure the accuracy of the path and direction of the laser beam during transmission.

[0065] In specific implementation, the transmission-to-reflection 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, the collimated beam entering the first fast-reflecting mirror 4 first enters the second beam splitter 12 before entering the laser transceiver assembly. After transmission through the second beam splitter 12, 99% of the transmitted energy enters the laser transceiver assembly, and 1% of the reflected energy enters the optical axis monitoring camera 11 for coaxiality detection of the optical axis.

[0066] In practice, the measurement accuracy of the optical axis monitoring camera 11 is less than 5 μrad, and the root mean square (RMS) accuracy of the surface shape is ≤80 nm.

[0067] The relevant parameters of the first fast reflector 4 and the second fast reflector 7 are selected as follows: working band is 1550±30nm, reflectivity is greater than 98%, angular resolution is ≤1μrad, angular deviation range is ±3mrad, and surface accuracy RMS is ≤21nm.

[0068] The first beam splitter 5 has a transmission-to-reflection ratio of 95:5 and a surface accuracy of RMS≤80nm.

[0069] The narrowband switcher 8 has a switching accuracy of less than 0.5° and can perform narrowband switching between the first and second wavelengths. For example, it can switch between two narrowband wavelengths, 1540nm and 1563nm.

[0070] The tracking lens group 9 has a measurement accuracy of less than 4 μrad and an aperture of 20 nm.

[0071] The wavelength range measured by the tracking detector 10 is 0.4 μm to 1.7 μm.

[0072] The coating of the dichroic mirror 6 can be, for example, a 1540nm reflective film with a reflectivity of 93%; and a 1563nm transmissive film with a transmittance of 93%.

[0073] The structure of the first signal transceiver unit 13 and the second signal transceiver unit 14 will be described below.

[0074] like Figure 3 As shown in part a, the first signal transceiver unit 13 includes a first transceiver terminal 13-1, a first collimating lens 13-2, a first fiber optic circulator 13-3, and a second transceiver terminal 13-4.

[0075] The first collimating lens 13-2 is disposed between the first transceiver 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 lens 13-2. The transmitting end 13-32 of the first fiber optic circulator 13-3 is used to emit the first collimated beam of the first wavelength. The receiving end 13-33 of the first fiber optic circulator 13-3 is coupled to the second transceiver 13-4 and is used to receive the laser beam of the first wavelength.

[0076] like Figure 3 As shown in part b, the second signal transceiver unit 14 includes a third transceiver terminal 14-1, a second collimating lens 14-2, a second fiber optic circulator 14-3, and a fourth transceiver terminal 14-4.

[0077] The second collimating lens 14-2 is positioned between the third transceiver 14-1 and the second fiber optic circulator 14-3.

[0078] The fiber end 14-31 of the second fiber optic circulator 14-3 is located at the focal point of the second collimating lens 14-2. The transmitting end 14-32 of the second fiber optic circulator 14-3 is used to emit a second collimated 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. The receiving end 14-33 of the second fiber optic circulator 14-3 is used to receive a laser beam of the second wavelength.

[0079] In specific implementation, the transmitting end 13-32 of the first fiber optic circulator 13-3 is used to emit a collimated beam of 1563nm, and the receiving end 13-33 of the first fiber optic circulator 13-3 is used to receive the 1563nm laser beam. The transmitting end 14-32 of the second fiber optic circulator 14-3 is used to emit a collimated beam of 1540nm, and the receiving end 14-33 of the second fiber optic circulator 14-3 is used to receive the 1540nm laser beam.

[0080] In some embodiments, such as Figure 4 As shown in part a, the first signal receiver 13 further includes a first filter 13-5, which is connected to the receiving end 13-33 of the first fiber optic circulator 13-3 and the second transceiver end 13-4.

[0081] like Figure 4 As shown in part b, the second signal receiver 14 further includes a second filter 14-5, which is connected to the receiving end 14-33 of the first fiber optic circulator 14-3 and the fourth transceiver end 14-4.

[0082] The first filter 13-5 and the second filter 14-5 can be notch filters.

[0083] Based on the dual-state compatible bidirectional beaconless laser communication device described above, the following beneficial effects can be achieved: 1. High integration, low effective cost, and reduced overall size; 2. The dual-state compatible design can meet the high coaxiality requirements of dual-channel bidirectional beaconless laser communication and has an optical axis calibration function to ensure optical axis coaxiality; 3. The use of a low-cost narrowband switcher to achieve narrowband switching further reduces costs.

[0084] The present invention provides a dual-state compatible bidirectional beaconless laser communication device, comprising a laser transceiver component, an optical transmission component, a first signal transceiver unit, a second signal transceiver unit, and a control unit. The laser transceiver component is used to beam-contract a signal-carrying laser beam and emit the beam-contracted laser beam; the laser beam is transmitted along a first output optical path. The optical transmission component, disposed on the first output optical path, is used to receive the laser beam and split it into two outputs; one output is transmitted along a second output optical path, and the other output is transmitted along a third output optical path. The first signal transceiver unit, disposed on the second output optical path, is used to form a first optical receiving path or a first optical transmitting path with the optical transmission component. The second signal transceiver unit, disposed on the third output optical path, is used to form a second optical receiving path or a second optical transmitting path with the optical transmission component. The control unit, coupled to the first and second signal transceiver units, is used for... The control unit controls the current state to either a first state or a second state. In the first state, the control unit controls the first signal transceiver unit as a signal receiver and the second signal transceiver unit as a signal transmitter, 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 as a signal transmitter and the second signal transceiver unit as a signal receiver, 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 operating wavelengths of the first signal transceiver unit and the second signal transceiver unit are different. Therefore, this invention can realize two dual-state bidirectional beaconless laser communication based on a single optical transmission component. It has a high degree of integration, resulting in a smaller device size and a simpler overall design, which can effectively reduce production costs. At the same time, it can also ensure the accuracy of bidirectional beaconless laser communication. It effectively solves the problem that the low integration of existing multi-channel bidirectional beaconless laser communication devices leads to large size and high cost. It achieves the goal of improving the integration of bidirectional beaconless laser communication devices, reducing the size of bidirectional beaconless laser communication devices, and reducing production costs.

[0085] The following describes the bidirectional beaconless laser communication method compatible with dual states provided by the present invention. The bidirectional beaconless laser communication method compatible with dual states described below can be referred to in correspondence with the bidirectional beaconless laser communication device compatible with dual states described above.

[0086] Figure 5 This is a schematic flowchart of the dual-state compatible bidirectional beaconless laser communication method provided by the present invention. The dual-state compatible bidirectional beaconless laser communication method is applied to any of the dual-state compatible bidirectional beaconless laser communication devices described above.

[0087] like Figure 5As shown, a bidirectional beaconless laser communication method compatible with dual states may include the following steps S510~S530.

[0088] S510: The laser is emitted to the laser transceiver assembly, which then performs beam reduction on the laser to obtain a reduced laser beam. The laser beam is then emitted to the optical transmission assembly via the laser transceiver assembly.

[0089] S520: Set the current state to the first state; in the first state, establish a first optical receiving path based on the optical transmission component and the first signal transceiver unit; and establish a second optical transmitting path based on the optical transmission component and the second signal transceiver unit;

[0090] S530: Set the current state to the second state; in the second state, establish a second optical receiving path based on the optical transmission component and the second signal transceiver unit; and establish a first optical transmitting path based on the optical transmission component and the first signal transceiver unit.

[0091] In some embodiments, the optical transmission component includes a first fast-reflecting mirror, a first beam splitter, a dichroic mirror, a second fast-reflecting mirror, a narrowband switcher, a tracking lens group, and a tracking detector. Based on the optical transmission component and the first signal transceiver unit, establishing a first optical receiving path includes: reflecting a laser beam through the first beam splitter, which splits the laser beam into a first laser beam and a second laser beam; reflecting the first laser beam through the first beam splitter into the narrowband switcher, then into the tracking lens group, and finally coupling it to the tracking detector to establish a tracking optical axis; transmitting the second laser beam through the first beam splitter into the dichroic mirror, and then into the first signal transceiver unit, thus completing the establishment of the first optical receiving path. Based on the optical transmission component and the second signal transceiver unit, a second optical transmission path is established, including: the second signal transceiver unit emits a first collimated beam carrying a signal; the first collimated beam is reflected by a second fast mirror and enters a dichroic mirror; after being transmitted through the dichroic mirror, it enters a first beam splitter; after being transmitted through the first beam splitter, it enters a first fast mirror; after being reflected by the first fast mirror, it enters the laser transceiver component, thus completing the establishment of the second optical transmission path.

[0092] In some embodiments, establishing a second optical receiving path based on an optical transmission component and a second signal transceiver unit includes: reflecting a laser beam through a first beam splitter into the first beam splitter, which splits the laser beam into a first laser beam and a second laser beam; reflecting the first laser beam through the first beam splitter into a narrowband switcher, then into a tracking lens group, and finally coupling it to a tracking detector to establish a tracking optical axis; transmitting the second laser beam through the first beam splitter into a dichroic mirror, reflecting it into a second fast-reflecting mirror, and finally reflecting it into the second signal transceiver unit to complete the establishment of the second optical receiving path; establishing a first optical transmitting path based on the optical transmission component and the first signal transceiver unit includes: the first signal transceiver unit emitting a second collimated beam carrying a signal, transmitting the second collimated beam through the dichroic mirror into the first beam splitter, then through the first beam splitter into the first fast-reflecting mirror, and finally reflecting it into the laser transceiver component to complete the establishment of the first optical transmitting path.

[0093] The present invention provides a bidirectional, beacon-free laser communication method compatible with dual states, comprising: emitting a laser beam to a laser transceiver component; using the laser transceiver component to reduce the laser beam to obtain a reduced laser beam; and using the laser transceiver component to transmit the laser beam to an optical transmission component; setting the current state to a first state; in the first state, establishing a first optical receiving path based on the optical transmission component and a first signal transceiver unit; and establishing a second optical transmitting path based on the optical transmission component and a second signal transceiver unit; setting the current state to a second state; in the second state, establishing the second optical receiving path based on the optical transmission component and the second signal transceiver unit; and establishing the first optical transmitting path based on the optical transmission component and the first signal transceiver unit. Therefore, this invention can realize two dual-state bidirectional beaconless laser communication based on a single optical transmission component. It has a high degree of integration, resulting in a smaller device size and a simpler overall design, which can effectively reduce production costs. At the same time, it can also ensure the accuracy of bidirectional beaconless laser communication. It effectively solves the problem that the low integration of existing multi-channel bidirectional beaconless laser communication devices leads to large size and high cost. It achieves the goal of improving the integration of bidirectional beaconless laser communication devices, reducing the size of bidirectional beaconless laser communication devices, and reducing production costs.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bidirectional, beacon-free laser communication device compatible with dual states, characterized in that, include: A laser transceiver assembly is used to reduce the laser beam carrying a signal to a smaller beam and output the reduced laser beam. The laser beam propagates along the first outgoing optical path; An optical transmission component is disposed on the first outgoing optical path and is used to receive the laser beam and then output the laser beam in two paths; one output is transmitted along the second outgoing optical path and the other output is transmitted along the third outgoing optical path. The first signal transceiver unit is disposed on the second outgoing optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission component; The second signal transceiver unit is disposed on the third outgoing optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission component. A control unit, coupled to the first and second signal transceiver units, is used to control the current state to be either a first state or a second state. In the first state, the control unit controls the first signal transceiver unit to be a signal receiver and the second signal transceiver unit to be a signal transmitter, so that the first signal transceiver unit and the optical transmission component constitute the first optical receiving path, and the second signal transceiver unit and the optical transmission component constitute the second optical transmitting path. In the second state, the control unit controls the first signal transceiver unit to be a signal transmitter and the second signal transceiver unit to be a signal receiver, so that the first signal transceiver unit and the optical transmission component constitute the first optical transmitting path, and the second signal transceiver unit and the optical transmission component constitute the second optical receiving path. The first and second signal transceiver units operate at different wavelengths.

2. The bidirectional beaconless laser communication device compatible with dual states according to claim 1, characterized in that, The optical transmission assembly includes a first fast-reflecting mirror, a first beam splitter, a dichroic mirror, a second fast-reflecting mirror, a narrowband switcher, a tracking lens group, and a tracking detector; The first fast-reflecting mirror is disposed on the first outgoing light path, the first beam splitter is disposed on the reflected light path of the first fast-reflecting mirror, the dichroic mirror is disposed on the transmitted light path of the first beam splitter, and the second fast-reflecting mirror is disposed on the reflected light path of the dichroic mirror. The tracking detector is disposed on the reflected light path of the first beam splitter, and the tracking detector is disposed at the focal position of the tracking detector. The narrowband switch is disposed between the first beam splitter and the tracking lens group.

3. The bidirectional beaconless laser communication device compatible with dual states according to claim 2, characterized in that, Also includes: Optical axis alignment components; 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-reflecting mirror and the laser transceiver assembly. The first fast-reflecting mirror is located on the transmission optical path of the second beam splitter, and the optical axis monitoring camera is disposed on the reflection optical path of the second beam splitter.

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

1.

5. The bidirectional beaconless laser communication device compatible with dual states 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 disposed between the first transceiver and the first fiber optic circulator; The fiber end of the first fiber optic circulator is located at the focal point of the first collimating lens. The transmitting end of the first fiber optic circulator is used to emit a first collimated beam of the first wavelength. The receiving end of the first fiber optic circulator is coupled to the second transceiver end. The receiving end of the first fiber optic circulator is used to receive the laser beam of the first wavelength. The second signal transceiver unit includes a third transceiver terminal, a fourth transceiver terminal, a second collimating lens, and a second fiber optic circulator; The second collimating lens is disposed between the third transceiver and the second fiber optic circulator; The fiber end of the second fiber optic circulator is located at the focal point of the second collimating lens. The transmitting end of the second fiber optic circulator is used to emit a second collimated beam of the second wavelength. The receiving end of the second fiber optic circulator is coupled to the fourth transceiver end and 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, characterized in that, The first signal receiver further includes: a first filter, wherein the first filter is connected to the receiving end of the first fiber optic circulator and the second transceiver end; The second signal receiver further includes a second filter, which is connected to the receiving end of the second fiber optic circulator and the fourth transceiver end.

7. The bidirectional beaconless laser communication device compatible with dual states 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, with the secondary mirror positioned on the reflected light path of the primary mirror and the eyepiece positioned on the reflected light path of the secondary mirror.

8. A dual-state compatible bidirectional beaconless laser communication method, applied to the dual-state compatible bidirectional beaconless laser communication device as described in any one of claims 1-7, characterized in that, include: The laser is emitted to a laser transceiver assembly, which then performs beam reduction on the laser to obtain a reduced laser beam. The laser beam is then emitted to an optical transmission assembly via the laser transceiver assembly. Set the current state 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; Furthermore, a second optical transmission path is established based on the optical transmission component and the second signal transceiver unit; Alternatively, set the current state 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; Furthermore, a first optical transmission path is established based on the optical transmission component and the first signal transceiver unit.

9. The bidirectional beaconless laser communication method compatible with dual states according to claim 8, characterized in that, The optical transmission assembly includes a first fast-reflecting mirror, a first beam splitter, a dichroic mirror, a second fast-reflecting mirror, a narrowband switcher, a tracking lens group, and a tracking detector; The establishment of a first optical receiving path based on the optical transmission component and the first signal transceiver unit includes: reflecting the laser beam through the first beam splitter and entering the first beam splitter, wherein 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 switcher, then enters the tracking lens group, 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 then transmitted through the dichroic mirror into the first signal transceiver unit, thus completing the establishment of the first optical receiving path; The establishment of a second optical transmission path based on the optical transmission component and the second signal transceiver unit includes: the second signal transceiver unit emitting a first collimated beam carrying a signal; the first collimated beam being reflected by the second fast reflector and entering the dichroic mirror; being transmitted through the dichroic mirror and entering the first beam splitter; being transmitted through the first beam splitter and entering the first fast reflector; and being reflected by the first fast reflector and entering the laser transceiver component, thus completing the establishment of the second optical transmission path.

10. The bidirectional beaconless laser communication method compatible with dual states according to claim 8, characterized in that, The optical transmission assembly includes a first fast-reflecting mirror, a first beam splitter, a dichroic mirror, a second fast-reflecting mirror, a narrowband switcher, a tracking lens group, and a tracking detector; The step of establishing a second optical receiving path based on the optical transmission component and the second signal transceiver unit includes: reflecting the laser beam through the first beam splitter and entering the first beam splitter, wherein 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 switcher, then enters the tracking lens group, 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, reflected by the dichroic mirror into the second fast-reflecting mirror, and reflected by the second fast-reflecting mirror into the second signal transceiver unit, thus completing the establishment of the second optical receiving path; The establishment of a first optical transmission path based on the optical transmission component and the first signal transceiver unit includes: the first signal transceiver unit emitting a second collimated beam carrying a signal; the second collimated beam being transmitted through the dichroic mirror and entering the first beam splitter; being transmitted through the first beam splitter and entering the first fast reflector; and being reflected by the first fast reflector and entering the laser transceiver component, thereby completing the establishment of the first optical transmission path.

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