Signal transceiver and bidirectional beaconless laser communication device

Abstract

The application provides a signal transceiver and a two-way beaconless laser communication device, and relates to the field of laser signal communication. In the signal transceiver, a collimating lens is located between a first transceiving end and a wavelength division multiplexer. An input end of the wavelength division multiplexer is arranged at a focal point of the collimating lens. An output end of the wavelength division multiplexer is connected with a first fiber ring through a first filter and connected with a second fiber ring through a second filter. A transmitting end and a receiving end of the first fiber ring are coupled with a second transceiving end and a third transceiving end respectively to realize the purpose of transmitting and receiving laser beams of a first wavelength. The receiving end and the receiving end of the first fiber ring are coupled with a fourth transceiving end and a fifth transceiving end respectively to realize the purpose of transmitting and receiving laser beams of a second wavelength. The first wavelength and the second wavelength are two wavelengths in any set wavelength range. The application can effectively improve the communication rate of the beaconless laser communication.

Description

Technical Field

[0001] This invention relates to the field of laser communication technology, and in particular to a signal transceiver and a two-way beaconless laser communication device. 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 costly, resulting in high costs for laser communication based on fiber optic networks. Furthermore, there is a risk of cable damage. To meet the increasing demand for laser communication, multi-channel, bidirectional, beacon-less laser communication devices have emerged.

[0004] In two-way beaconless laser communication devices, the transceiver can only transmit and receive two specific wavelengths, which greatly limits the communication rate of the two-way beaconless laser communication device. Summary of the Invention

[0005] This invention provides a signal transceiver and a two-way beaconless laser communication device to solve the problem that the communication rate of a two-way beaconless laser communication device is low because the signal transceiver can only transmit and receive two specific wavelengths. This invention can broaden the range of wavelengths that the signal transceiver can transmit and receive, and effectively improve the communication rate.

[0006] This invention provides a signal transceiver, comprising: a collimating lens, a wavelength division multiplexer (WDM), a first filter, a second filter, a first fiber optic circulator, a second fiber optic circulator, a first transceiver end, a second transceiver end, a third transceiver end, a fourth transceiver end, and a fifth transceiver end; the collimating lens is disposed between the first transceiver end and the WDM; the input end of the WDM is located at the focal point of the collimating lens, and the output end of the WDM is connected to the fiber end of the first fiber optic circulator via the first filter; the output end of the WDM is also connected to the fiber end of the second fiber optic circulator via the second filter; the transmitting end of the first fiber optic circulator is coupled to the second transceiver end for transmitting a laser beam of a first wavelength; the receiving end of the first fiber optic circulator is coupled to the third transceiver end for receiving the laser beam of the first wavelength; the transmitting end of the second fiber optic circulator is coupled to the fourth transceiver end for transmitting a laser beam of a second wavelength; the receiving end of the second fiber optic circulator is coupled to the fifth transceiver end for receiving the laser beam of the second wavelength; the first wavelength and the second wavelength are two wavelengths within any set wavelength range.

[0007] According to a signal transceiver provided by the present invention, the above-mentioned wavelength range is set to 1537nm~1543nm.

[0008] According to a signal transceiver provided by the present invention, the above-mentioned wavelength range is set to 1558nm to 1564nm.

[0009] This invention also provides a bidirectional beaconless laser communication device, comprising: two signal transceivers as described above, a laser transceiver assembly, an optical transmission assembly, and a control unit; the laser transceiver assembly 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 assembly is disposed on the first output optical path, used to receive the laser beam, transmit the laser beam, and output it in two paths; 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 of the two signal transceivers is disposed on the second output optical path, used to form a first optical receiving path or a first optical transmitting path with the optical transmission assembly; the second signal transceiver of the two signal transceivers is disposed on the third output optical path, used to form a second optical receiving path or a second optical transmitting path with the optical transmission assembly; the first signal transceiver transmits and receives signals. The wavelength ranges of the two wavelengths transmitted and received by the first transceiver are different from those of the two wavelengths transmitted and received by the second transceiver. The control unit, coupled to the first and second transceivers, is used to control the current state to be either the first state or the second state. In the first state, the control unit controls the first transceiver to be the signal receiver and the second transceiver to be the signal transmitter. The first transceiver and the optical transmission component form the first optical receiving path, and the second transceiver and the optical transmission component form the second optical transmitting path. In the second state, the control unit controls the first transceiver to be the signal transmitter and the second transceiver to be the signal receiver. The first transceiver and the optical transmission component form the first optical transmitting path, and the second transceiver and the optical transmission component form the second optical receiving path. In either the first or second state, the operating wavelengths of the first and second transceivers are different.

[0010] According to the present invention, a bidirectional beaconless laser communication device includes an optical transmission component comprising 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 the tracking lens group is disposed between the first beam splitter and the tracking detector. The narrowband switcher is disposed between the first beam splitter and the tracking lens group.

[0011] According to the present invention, a two-way beaconless laser communication device 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 a first fast-reflecting mirror and a laser transceiver component, the first fast-reflecting mirror is disposed in the transmission optical path of the second beam splitter, and the optical axis monitoring camera is disposed in the reflection optical path of the second beam splitter.

[0012] According to the present invention, a two-way 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.

[0013] The present invention provides a signal transceiver and a bidirectional beaconless laser communication device. The signal transceiver includes a collimating lens, a wavelength division multiplexer (WDM), a first filter, a second filter, a first fiber optic circulator, a second fiber optic circulator, a first transceiver end, a second transceiver end, a third transceiver end, a fourth transceiver end, and a fifth transceiver end. The collimating lens is disposed between the first transceiver end and the WDM. The input end of the WDM is located at the focal point of the collimating lens. The output end of the WDM is connected to the fiber end of the first fiber optic circulator through the first filter, and the output end of the WDM is also connected to the fiber end of the second fiber optic circulator through the second filter. The transmitting end of the first fiber optic circulator is coupled to the second transceiver end for transmitting a laser beam of a first wavelength. The receiving end of the first fiber optic circulator is coupled to the third transceiver end for receiving the laser beam of the first wavelength. The transmitting end of the second fiber optic circulator is coupled to the fourth transceiver end for transmitting a laser beam of a second wavelength. The receiving end of the second fiber optic circulator is coupled to the fifth transceiver end for receiving the laser beam of the second wavelength. The first wavelength and the second wavelength are two wavelengths within any set wavelength range. Therefore, the transceiver in this invention can transmit and receive two wavelengths within a set wavelength range, expanding the range of transmit and receive wavelengths to a single wavelength range, rather than being limited to only two specific wavelengths. This effectively solves the problem of low communication rates in existing two-way beaconless laser communication devices, where the transceiver can only transmit and receive two specific wavelengths. By expanding the range of transmit and receive wavelengths, the communication rate is effectively improved. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the structure of the signal transceiver provided in an embodiment of the present invention.

[0016] Figure 2 This is one of the structural schematic diagrams of the bidirectional beaconless laser communication device provided in the embodiments of the present invention.

[0017] Figure 3 This is the second schematic diagram of the structure of the bidirectional beaconless laser communication device provided in the embodiment of the present invention.

[0018] Figure label:

[0019] 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; 14: Second signal transceiver; 100: Signal transceiver; 101: Collimating lens; 102: Wavelength division multiplexer; 103: First filter; 104: Second filter; 105: First fiber optic circulator; 106: Second fiber optic circulator; 107: First transceiver terminal; 108: Second transceiver terminal; 109: Third transceiver terminal; 110: Fourth transceiver terminal; 111: Fifth transceiver terminal. Detailed Implementation

[0020] 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.

[0021] The following is combined Figure 1 The present invention describes a signal transceiver.

[0022] Figure 1 This is a schematic diagram of the signal transceiver provided by the present invention. Figure 1 As shown, the signal transceiver 100 includes: a collimating lens 101, a wavelength division multiplexer 102, a first filter 103, a second filter 104, a first fiber optic circulator 105, a second fiber optic circulator 106, a first transceiver terminal 107, a second transceiver terminal 108, a third transceiver terminal 109, a fourth transceiver terminal 110, and a fifth transceiver terminal 111.

[0023] The collimating lens 101 is disposed between the first transceiver 107 and the wavelength division multiplexer 102.

[0024] The input terminal of wavelength division multiplexer 102 is set at the focal point of collimating lens. The output terminal of wavelength division multiplexer 102 is connected to the fiber end of first fiber optic circulator 105 through first filter 103. The output terminal of wavelength division multiplexer 102 is also connected to the fiber end of second fiber optic circulator 106 through second filter 104.

[0025] The transmitting end of the first fiber optic circulator 105 is coupled to the second transceiver end 108 for transmitting a laser beam of the first wavelength; the receiving end of the first fiber optic circulator 105 is coupled to the third transceiver end 109 for receiving the laser beam of the first wavelength.

[0026] The transmitting end of the second fiber optic circulator 106 is coupled to the fourth transceiver end 110 for transmitting a laser beam of the second wavelength; the receiving end of the second fiber optic circulator 106 is coupled to the fifth transceiver end 111 for receiving a laser beam of the second wavelength.

[0027] The first wavelength and the second wavelength are two wavelengths within an arbitrarily defined wavelength range.

[0028] In some embodiments, the wavelength range described above can be 1537nm to 1543nm. In this case, the first wavelength and the second wavelength can be any two wavelengths from 1537nm to 1543nm. For example, the first wavelength can be 1539nm and the second wavelength can be 1542nm.

[0029] In some embodiments, the wavelength range described above can be 1558nm to 1564nm. In this case, the first wavelength and the second wavelength can be any two wavelengths from 1558nm to 1564nm. For example, the first wavelength can be 1560nm and the second wavelength can be 1563nm.

[0030] It should be noted that the first filter 103 and the second filter 104 are filters that allow specific wavelengths to pass through. The specific wavelength allowed by the first filter 103 is the first wavelength, and the specific wavelength allowed by the second filter 104 is the second wavelength.

[0031] For example, when the first wavelength is 1539 nm and the second wavelength is 1542 nm, the first filter 103 allows a specific wavelength of 1539 nm to pass through, and the second filter 104 allows a specific wavelength of 1542 nm to pass through.

[0032] For example, when the first wavelength is 1560 nm and the second wavelength is 1563 nm, the first filter 103 allows a specific wavelength of 1560 nm to pass through, and the second filter 104 allows a specific wavelength of 1563 nm to pass through.

[0033] The first filter 103 and the second filter 104 meet the single-wavelength 200G bandwidth requirement.

[0034] The first fiber optic circulator 105 and the second fiber optic circulator 106 allow specific wavelengths to pass within the range of 1525nm-1610nm, with a return isolation >50dB.

[0035] The collimating lens 101 has a working wavelength range of 450nm to 2500nm; a focal length of 25.4mm; an off-axis distance of 50.8mm; and an aperture of 25.4mm.

[0036] Wavelength division multiplexer 102 is used to divide the first wavelength and the second wavelength in the beam.

[0037] The signal transceiver provided by this invention includes a collimating lens, a wavelength division multiplexer (WDM), a first filter, a second filter, a first fiber optic circulator, a second fiber optic circulator, a first transceiver end, a second transceiver end, a third transceiver end, a fourth transceiver end, and a fifth transceiver end. The collimating lens is disposed between the first transceiver end and the WDM. The input end of the WDM is located at the focal point of the collimating lens. The output end of the WDM is connected to the fiber end of the first fiber optic circulator through the first filter, and the output end of the WDM is also connected to the fiber end of the second fiber optic circulator through the second filter. The transmitting end of the first fiber optic circulator is coupled to the second transceiver end for transmitting a laser beam of a first wavelength. The receiving end of the first fiber optic circulator is coupled to the third transceiver end for receiving the laser beam of the first wavelength. The transmitting end of the second fiber optic circulator is coupled to the fourth transceiver end for transmitting a laser beam of a second wavelength. The receiving end of the second fiber optic circulator is coupled to the fifth transceiver end for receiving the laser beam of the second wavelength. The first wavelength and the second wavelength are two wavelengths within any set wavelength range. Therefore, the transceiver in this invention can transmit and receive two wavelengths within a set wavelength range, expanding the range of transmit and receive wavelengths to a single wavelength range, rather than being limited to only two specific wavelengths. This effectively solves the problem of low communication rates in existing two-way beaconless laser communication devices, where the transceiver can only transmit and receive two specific wavelengths. By expanding the range of transmit and receive wavelengths, the communication rate is effectively improved.

[0038] Figure 2 This is one of the structural schematic diagrams of a bidirectional beaconless laser communication device provided in an embodiment of the present invention. Figure 2 As shown, the two-way beaconless laser communication device includes: two of the above-mentioned signal transceivers, a laser transceiver assembly, an optical transmission assembly, and a control unit.

[0039] See Figure 2The 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.

[0040] In practice, the beam shrinkage and beam expansion ratios of the laser transceiver components are 10 times, and the surface accuracy is less than or equal to 21nm.

[0041] In practice, the focal length of the laser transceiver assembly can be 250mm.

[0042] 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.

[0043] The two signal transceivers include a first signal transceiver 13 and a second signal transceiver 14.

[0044] The first signal transceiver 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.

[0045] The second signal transceiver 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.

[0046] Control unit ( Figure 2 (not shown in the image), coupled to the first signal transceiver 13 and the second signal transceiver 14, for controlling the current state to be the first state or the second state.

[0047] In the first state, the control unit controls the first transceiver 13 as a signal receiver and the second transceiver 14 as a signal transmitter. In this state, the optical receiving path consists of the first transceiver 13 and the optical transmission component, and the optical transmitting path consists of the second transceiver 14 and the optical transmission component 13.

[0048] In the second state, the control unit controls the first transceiver 13 as the signal transmitter and the second transceiver 14 as the signal receiver. The first transceiver 13 and the optical transmission component constitute the first optical transmission path, and the second transceiver 14 and the optical transmission component constitute the second optical receiving path.

[0049] The wavelength ranges of the two wavelengths transmitted and received by the first transceiver 13 are different from those of the two wavelengths transmitted and received by the second transceiver 14.

[0050] For example, the wavelength range of the two wavelengths transmitted and received by the first transceiver 13 can be 1537nm to 1543nm. In this case, the wavelength range of the two wavelengths transmitted and received by the second transceiver 14 is 1558nm to 1564nm.

[0051] For example, the wavelength range of the two wavelengths transmitted and received by the first transceiver 13 can be 1558nm to 1564nm. In this case, the wavelength range of the two wavelengths transmitted and received by the second transceiver 14 is 1537nm to 1543nm.

[0052] The first transceiver 13 transmits the first wavelength as a signal transmitter, and the second transceiver receives the second wavelength as a signal receiver. In this case, a 100G transmission rate (i.e., a data transmission rate of 100 Gbits per second) can be achieved.

[0053] The wavelength range of the two wavelengths transmitted and received by the first transceiver 13 is different from that of the two wavelengths transmitted and received by the second transceiver. The first transceiver 13, as a signal transmitter, can transmit two specific wavelengths within one wavelength range, and the first transceiver 14, as a signal receiver, can receive two specific wavelengths within another wavelength range. In this case, the communication rate can be expanded according to the corresponding wavelengths to meet the communication rate requirements of 800G and above.

[0054] The following describes the setup of the optical transmission component and the process by which the laser transceiver component, the optical transmission component, the first signal transceiver 13, and the second signal transceiver 14 work together to transmit and receive signals.

[0055] Please continue reading Figure 2 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.

[0056] 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.

[0057] 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.

[0058] 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 to the first signal transceiver 13, thereby establishing the first optical receiving path.

[0059] 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 14, thereby establishing the second optical receiving path.

[0060] The first transceiver 13 can emit a first collimated beam of a first wavelength, and the second transceiver 14 can emit a second collimated beam of a second wavelength. In this case, the first transceiver 13 and the second transceiver 14 can complete the transmission of optical signals.

[0061] Please continue reading Figure 1 The first signal transceiver 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.

[0062] Please continue reading Figure 1 The second signal transceiver 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.

[0063] It should be noted that the first transceiver 13 and the second transceiver 14 operate at different wavelengths. That is, the first wavelength and the second wavelength are different.

[0064] The first transceiver 13 operates at a first wavelength, and can emit a first collimated beam of the first wavelength and receive a laser beam of the first wavelength.

[0065] The second transceiver 14 operates at a second wavelength. The second transceiver 14 can emit a second collimated beam of the second wavelength and receive a laser beam of the second wavelength.

[0066] The first and second wavelengths are described in the corresponding descriptions in the above embodiments, and will not be repeated here.

[0067] 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 above-mentioned bidirectional beaconless laser communication device will be introduced below.

[0068] See Figure 2 As shown, the current state of the two-way beaconless laser communication device can be controlled by the control unit to be the first state. In the first state, the first signal transceiver 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 reflector 4. After being reflected by the first fast reflector 4, it enters the laser transceiver assembly. The laser transceiver assembly expands the beam and emits the signal, thus completing the signal transmission. The laser carrying the signal emitted from the external device enters the laser transceiver assembly. After being beam-contracted by the laser transceiver assembly, the laser beam is obtained. The 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 14, which serves as the signal receiver. The second signal transceiver 14 receives the signal, thus completing the signal reception. In the first state, the laser beam received by the optical transmission component is reflected by the first fast mirror 4 and enters the first beam splitter 5. After being reflected by the first beam splitter 5, it enters the narrowband switcher 8 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 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.

[0069] Please continue reading Figure 1As shown, the current state of the two-way beaconless laser communication device can be controlled by the control unit to be the second state. In the second state, the second signal transceiver 14, as the 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 reflected by the dichroic mirror 6, it enters the first beam splitter 5. After being transmitted by 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. The laser transceiver assembly expands the beam and emits the signal, thus completing the signal transmission. The laser carrying the signal emitted from the external device enters the laser transceiver assembly. After being beam-contracted by the laser transceiver assembly, the 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 by the first beam splitter 5, it enters the dichroic mirror 6. After being transmitted by the dichroic mirror 6, it enters the first signal transceiver 13, which serves as the signal receiver. The first signal transceiver 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 component is reflected by the first fast mirror 4 and enters the first beam splitter 5. After being reflected by the first beam splitter 5, it enters the narrowband switcher 8 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 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.

[0070] In some embodiments, such as Figure 3 As shown, the two-way beaconless laser communication device may also include: an optical axis alignment component.

[0071] The optical axis alignment assembly includes an optical axis monitoring camera 11 and a second beam splitter 12.

[0072] 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.

[0073] 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.

[0074] See Figure 3In the first state, the first signal transceiver 13, 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.

[0075] In the second state, the second signal transceiver 14, acting as a 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 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-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 the other portion of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0076] 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.

[0077] In specific implementations, 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.

[0078] 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.

[0079] 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 is ≤21nm.

[0080] The first beam splitter 5 has a transmission-to-reflection ratio of 95:5 and a surface accuracy of RMS≤80nm.

[0081] The narrowband switcher 8 has a switching accuracy of less than 0.5° and can perform narrowband switching between a first wavelength and a second wavelength. For example, it can switch between two narrowbands: a first operating wavelength and a second operating wavelength. The first operating wavelength is any wavelength within the range of 1540nm ± 3nm, and the second operating wavelength is any wavelength within the range of 1561nm ± 3nm.

[0082] The tracking lens group 9 has a measurement accuracy of less than 4 μrad and an aperture of 20 nm.

[0083] The wavelength range measured by the tracking detector 10 is 0.4 μm to 1.7 μm.

[0084] The coating of the dichroic mirror 6 can be, for example, a 1540nm±3nm reflective film with a reflectivity of 93%; and a 1563nm±3nm transmissive film with a transmittance of 93%.

[0085] This invention provides a bidirectional beaconless laser communication device, comprising a laser transceiver assembly, an optical transmission assembly, a first signal transceiver, a second signal transceiver, and a control unit. The laser transceiver assembly is used to beam-contract a signal-carrying laser beam and emit the beam-contracted laser beam; the laser beam propagates along a first output optical path. The optical transmission assembly, disposed on the first output optical path, is used to receive the laser beam and split it into two outputs; one output propagates along a second output optical path, and the other output propagates along a third output optical path. The first signal transceiver, 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 assembly. The second signal transceiver, 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 assembly. The control unit is coupled to the first and second signal transceivers. The control unit controls the current state to be either a first state or a second state. In the first state, the control unit controls the first transceiver to be a signal receiver and the second transceiver to be a signal transmitter, so that the first transceiver and the optical transmission component form a first optical receiving path and the second transceiver and the optical transmission component form a second optical transmitting path. In the second state, the control unit controls the first transceiver to be a signal transmitter and the second transceiver to be a signal receiver, so that the first transceiver and the optical transmission component form a first optical transmitting path and the second transceiver and the optical transmission component form a second optical receiving path. The first transceiver and the second transceiver operate at different wavelengths. The transceiver includes a collimating lens, a wavelength division multiplexer (WDM), a first filter, a second filter, a first fiber optic circulator, a second fiber optic circulator, a first transceiver end, a second transceiver end, a third transceiver end, a fourth transceiver end, and a fifth transceiver end. The collimating lens is positioned between the first transceiver end and the WDM. The input end of the WDM is located at the focal point of the collimating lens. The output end of the WDM is connected to the fiber optic end of the first fiber optic circulator via the first filter, and the output end of the WDM is also connected to the fiber optic end of the second fiber optic circulator via the second filter. The transmitting end of the first fiber optic circulator is coupled to the second transceiver end to transmit a laser beam of a first wavelength. The receiving end of the first fiber optic circulator is coupled to the third transceiver end to receive the laser beam of the first wavelength. The transmitting end of the second fiber optic circulator is coupled to the fourth transceiver end to transmit a laser beam of a second wavelength. The receiving end of the second fiber optic circulator is coupled to the fifth transceiver end to receive the laser beam of the second wavelength. The first wavelength and the second wavelength are two wavelengths within any set wavelength range.Therefore, the transceiver in this invention can transmit and receive two wavelengths within a set wavelength range, expanding the range of transmit and receive wavelengths to a single wavelength range, rather than being limited to only two specific wavelengths. This effectively solves the problem of low communication rates in existing two-way beaconless laser communication devices, where the transceiver can only transmit and receive two specific wavelengths. By expanding the range of transmit and receive wavelengths, the communication rate is effectively improved.

[0086] The bidirectional beaconless laser communication method provided by the present invention is described below. The bidirectional beaconless laser communication method described below can be referred to in correspondence with the bidirectional beaconless laser communication device described above.

[0087] The bidirectional beaconless laser communication method in this embodiment of the invention is applied to the bidirectional beaconless laser communication device as described above.

[0088] The two-way beaconless laser communication method may include the following steps one through three.

[0089] Step 1: 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.

[0090] Step 2: 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; and establish a second optical transmitting path based on the optical transmission component and the second signal transceiver.

[0091] Step 3: 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; and establish a first optical transmitting path based on the optical transmission component and the first signal transceiver.

[0092] 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, 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, thus completing the establishment of the first optical receiving path. Based on the optical transmission component and the second signal transceiver, a second optical transmission path is established, including: the second signal transceiver emitting a first collimated beam carrying a signal; the first collimated beam being reflected by a second fast mirror and entering a dichroic mirror; being transmitted through the dichroic mirror and entering a first beam splitter; being transmitted through the first beam splitter and entering a first fast mirror; and being reflected by the first fast mirror and entering the laser transceiver component, thus completing the establishment of the second optical transmission path.

[0093] In some embodiments, establishing a second optical receiving path based on an optical transmission component and a second signal transceiver 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 a second signal transceiver 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 includes: the first signal transceiver 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.

[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 two-way beaconless laser communication device, characterized in that, include: Two signal transceivers, a laser transceiver assembly, an optical transmission assembly, and a control unit; The signal transceiver includes: a collimating lens, a wavelength division multiplexer (WDM), a first filter, a second filter, a first fiber optic circulator, a second fiber optic circulator, a first transceiver end, a second transceiver end, a third transceiver end, a fourth transceiver end, and a fifth transceiver end. The collimating lens is disposed between the first transceiver end and the WDM. The input end of the WDM is located at the focal point of the collimating lens. The output end of the WDM is connected to the fiber optic end of the first fiber optic circulator via the first filter, and the output end of the WDM is also connected to the fiber optic end of the second fiber optic circulator via the second filter. The transmitting end of the first fiber optic circulator is coupled to the second transceiver end for transmitting a laser beam of a first wavelength. The receiving end of the first fiber optic circulator is coupled to the third transceiver end for receiving the laser beam of the first wavelength. The transmitting end of the second fiber optic circulator is coupled to the fourth transceiver end for transmitting a laser beam of a second wavelength. The receiving end of the second fiber optic circulator is coupled to the fifth transceiver end for receiving the laser beam of the second wavelength. The first wavelength and the second wavelength are two wavelengths within any set wavelength range. 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 is transmitted along a first output optical path. An optical transmission component is disposed on the first outgoing optical path to receive the laser beam, transmit the laser beam, and output it 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 of the two signal transceivers 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 transceiver of the two transceivers 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 wavelength range of the two wavelengths transmitted and received by the first transceiver is different from the wavelength range of the two wavelengths transmitted and received by the second transceiver. A control unit, coupled to the first and second transceivers, 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 transceiver to act as a signal receiver and the second transceiver to act as a signal transmitter, with the first transceiver and the optical transmission component forming the first optical receiving path and the second transceiver and the optical transmission component forming the second optical transmitting path. In the second state, the control unit controls the first transceiver to act as a signal transmitter and the second transceiver to act as a signal receiver, with the first transceiver and the optical transmission component forming the first optical transmitting path and the second transceiver and the optical transmission component forming the second optical receiving path. In either the first or second state, the first and second transceivers operate at different wavelengths.

2. The bidirectional beaconless laser communication device 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 lens group is disposed between the first beam splitter and the tracking detector; the narrowband switcher is disposed between the first beam splitter and the tracking lens group.

3. The bidirectional beaconless laser communication device 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 disposed in the transmission optical path of the second beam splitter, and the optical axis monitoring camera is disposed in the reflection optical path of the second beam splitter.

4. The bidirectional 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, 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.

5. The bidirectional beaconless laser communication device according to claim 1, characterized in that, The set wavelength range is 1537nm to 1543nm.

6. The bidirectional beaconless laser communication device according to claim 1, characterized in that, The set wavelength range is 1558nm to 1564nm.

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