Signal transceiver and bidirectional beacon-free laser communication device

Abstract

The invention provides a signal transceiver and a bidirectional beacon-free laser communication device, and relates to the field of laser signal communication, in the signal transceiver, a collimating lens is located between a first receiving and transmitting end and a wavelength division multiplexer; the input end of the wavelength division multiplexer is arranged at the focus position of the collimating lens, and the output end of the wavelength division multiplexer is connected with the first optical fiber circulator through the first filter and connected with the second optical fiber circulator through the second filter; the transmitting end and the receiving end of the first optical fiber circulator are respectively coupled with the second transmitting and receiving end and the third transmitting and receiving end so as to realize the purpose of transmitting and receiving a laser beam of a first wavelength; a receiving end and a receiving end of the first optical fiber circulator are respectively coupled with a fourth transceiving end and a fifth transceiving end so as to realize the purpose of transmitting and receiving a laser beam with a second wavelength; the first wavelength and the second wavelength are two wavelengths in any set wavelength range. According to the invention, the communication rate of beacon-free laser communication can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser communication, and in particular to a signal transceiver and a two-way beaconless laser communication device. Background Art

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

[0003] With the increasing demand for the Internet, higher requirements are put forward for the data transmission volume and transmission speed of laser communication. At present, most laser communications are realized based on fiber optic networks. Since optical cables need to be laid out in fiber optic networks and the cost of optical cables is relatively high, the cost of realizing laser communication based on fiber optic networks is relatively high, and there is also a risk of optical cables being damaged. In order to meet the demand for laser communication, a two-way beaconless laser communication device with multiple channels has emerged.

[0004] In a two-way beaconless laser communication device, the signal 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] The present invention provides a signal transceiver and a two-way beaconless laser communication device to solve the defect in the prior art that in a two-way beaconless laser communication device, the communication rate of the two-way beaconless laser communication device is relatively low because the signal transceiver can only transmit and receive two specific wavelengths, and can broaden the range of wavelengths that the signal transceiver can transmit and receive, effectively improving the communication rate.

[0006] The present invention provides a signal transceiver, including: a collimating lens, a wavelength division multiplexer, 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 arranged between the first transceiver end and the wavelength division multiplexer; the input end of the wavelength division multiplexer is arranged at the focal position of the collimating lens, the output end of the wavelength division multiplexer is connected to the fiber end of the first fiber optic circulator through the first filter, and the output end of the wavelength division multiplexer 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 a 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 a laser beam of the second wavelength; the first wavelength and the second wavelength are two wavelengths within any set wavelength range.

[0007] A signal transceiver provided by the present invention, the set wavelength range is 1537 nm to 1543 nm.

[0008] A signal transceiver provided by the present invention, the set wavelength range is 1558 nm to 1564 nm.

[0009] The present invention also provides a bidirectional beaconless laser communication device, including: 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 focus the laser carrying the signal and emit the focused laser beam; the laser beam is transmitted along the first emission optical path; the optical transmission assembly is arranged on the first emission optical path and is used to receive the laser beam, transmit the laser beam and output it in two paths; wherein, one output is transmitted along the second emission optical path, and the other output is transmitted along the third emission optical path; the first signal transceiver among the two signal transceivers is arranged on the second emission optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission assembly; the second signal transceiver among the two signal transceivers is arranged on the third emission optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission assembly; the wavelength ranges where the two wavelengths received and transmitted by the first signal transceiver are different from the wavelength ranges where the two wavelengths received and transmitted by the second signal transceiver; the control unit is coupled to the first signal transceiver and the second signal transceiver and is used to control the current state to be the first state or the second state; in the first state, the control unit controls the first signal transceiver to be the signal receiving end and the second signal transceiver to be the signal transmitting end, the first signal transceiver and the optical transmission assembly form the first optical receiving path, and the second signal transceiver and the optical transmission assembly form the second optical transmitting path; in the second state, the control unit controls the first signal transceiver to be the signal transmitting end and the second signal transceiver to be the signal receiving end, the first signal transceiver and the optical transmission assembly form the first optical transmitting path, and the second signal transceiver and the optical transmission assembly form the second optical receiving path; in the first state or the second state, the operating wavelengths of the first signal transceiver and the second signal transceiver are different.

[0010] A bidirectional beaconless laser communication device provided by the present invention, the optical transmission assembly includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector; the first fast steering mirror is arranged on the first emission optical path, the first beam splitter is arranged on the reflected optical path of the first fast steering mirror, the dichroic mirror is arranged on the transmitted optical path of the first beam splitter, and the second fast steering mirror is arranged on the reflected optical path of the dichroic mirror; the tracking detector is arranged on the reflected optical path of the first beam splitter, the tracking lens group is arranged between the first beam splitter and the tracking detector; the narrowband switch is arranged between the first beam splitter and the tracking lens group.

[0011] A bidirectional beaconless laser communication device provided by the present invention further includes: an optical axis alignment component; the optical axis alignment component includes an optical axis monitoring camera and a second beam splitter; the second beam splitter is disposed between the first fast steering mirror and the laser transceiver component, the first fast steering mirror is disposed 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.

[0012] In a bidirectional beaconless laser communication device provided by the present invention, the laser transceiver component includes a primary mirror, a secondary mirror, and an eyepiece; the primary mirror and the secondary mirror are disposed opposite to each other, the secondary mirror is disposed on the reflection optical path of the primary mirror, and the eyepiece is disposed on the reflection optical path of the secondary mirror.

[0013] The signal transceiver and the bidirectional beaconless laser communication device provided by the present invention. The signal transceiver includes a collimating lens, a wavelength division multiplexer, 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 wavelength division multiplexer; the input end of the wavelength division multiplexer is disposed at the focal position of the collimating lens, the output end of the wavelength division multiplexer is connected to the fiber end of the first fiber optic circulator through the first filter, and the output end of the wavelength division multiplexer 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 a 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 a laser beam of the second wavelength; the first wavelength and the second wavelength are two wavelengths within any set wavelength range. It can be seen that the signal transceiver in the present invention can transmit and receive two wavelengths within a set wavelength range, broaden the wavelengths that can be transmitted and received to a wavelength range, rather than being limited to only two specific wavelengths, thereby effectively solving the defect that the communication rate of the bidirectional beaconless laser communication device in the prior art is low due to the fact that the signal transceiver can only transmit and receive two specific wavelengths, broaden the wavelength range of the signal transceiver for transmitting and receiving, and effectively improve the communication rate. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of the signal transceiver provided by the embodiment of the present invention.

[0016] Figure 2 It is one of the schematic structural diagrams of the two-way beaconless laser communication device provided by the embodiments of the present invention.

[0017] Figure 3 It is the second of the schematic structural diagrams of the two-way beaconless laser communication device provided by the embodiments of the present invention.

[0018] Reference numerals: 1: primary mirror; 2: secondary mirror; 3: eyepiece; 4: first fast steering mirror; 5: first beam splitter; 6: dichroic mirror; 7: second fast steering mirror; 8: narrowband switch; 9: tracking lens group; 10: tracking detector; 11: optical axis monitoring camera; 12: second beam splitter; 13: first signal transceiver; 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 end; 108: second transceiver end; 109: third transceiver end; 110: fourth transceiver end; 111: fifth transceiver end. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0020] The following combines Figure 1 to describe the signal transceiver of the present invention.

[0021] Figure 1 It is the schematic structural diagram of the signal transceiver provided by the present invention. As Figure 1 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 end 107, a second transceiver end 108, a third transceiver end 109, a fourth transceiver end 110, and a fifth transceiver end 111.

[0022] The collimating lens 101 is disposed between the first transceiver end 107 and the wavelength division multiplexer 102.

[0023] The input end of the wavelength division multiplexer 102 is set at the focal position of the collimating lens. The output end of the wavelength division multiplexer 102 is connected to the optical fiber end of the first optical fiber circulator 105 through the first filter 103. The output end of the wavelength division multiplexer 102 is also connected to the optical fiber end of the second optical fiber circulator 106 through the second filter 104.

[0024] The transmitting end of the first optical fiber circulator 105 is coupled to the second transceiver 108 for transmitting a laser beam of the first wavelength; the receiving end of the first optical fiber circulator 105 is coupled to the third transceiver 109 for receiving a laser beam of the first wavelength.

[0025] The transmitting end of the second optical fiber circulator 106 is coupled to the fourth transceiver 110 for transmitting a laser beam of the second wavelength; the receiving end of the second optical fiber circulator 106 is coupled to the fifth transceiver 111 for receiving a laser beam of the second wavelength.

[0026] The first wavelength and the second wavelength are two wavelengths within an arbitrarily set wavelength range.

[0027] In some embodiments, the above-mentioned set wavelength range may be 1537 nm to 1543 nm. In this case, the first wavelength and the second wavelength may be any two wavelengths within 1537 nm to 1543 nm. For example, the first wavelength may be 1539 nm and the second wavelength may be 1542 nm.

[0028] In some embodiments, the above-mentioned set wavelength range may be 1558 nm to 1564 nm. In this case, the first wavelength and the second wavelength may be any two wavelengths within 1558 nm to 1564 nm. For example, the first wavelength may be 1560 nm and the second wavelength may be 1563 nm.

[0029] 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 to pass through by the first filter 103 is the first wavelength, and the specific wavelength allowed to pass through by the second filter 104 is the second wavelength.

[0030] Exemplarily, when the first wavelength is 1539 nm and the second wavelength is 1542 nm, the specific wavelength allowed to pass through by the first filter 103 is 1539 nm, and the specific wavelength allowed to pass through by the second filter 104 is 1542 nm.

[0031] Exemplarily, when the first wavelength is 1560 nm and the second wavelength is 1563 nm, the specific wavelength allowed to pass through by the first filter 103 is 1560 nm, and the specific wavelength allowed to pass through by the second filter 104 is 1563 nm.

[0032] The first filter 103 and the second filter 104 meet the single-wavelength 200G bandwidth requirement.

[0033] The first optical fiber circulator 105 and the second optical fiber circulator 106 allow the passing of specific wavelengths within the range of 1525 nm - 1610 nm, with an echo isolation > 50 dB.

[0034] The operating wavelength band of the collimating lens 101 can be 450 nm - 2500 nm; the focal length is 25.4 mm, the off-axis amount is 50.8 mm, and the aperture is 25.4 mm.

[0035] The wavelength division multiplexer 102 is used to demultiplex the first wavelength and the second wavelength in the light beam.

[0036] The signal transceiver provided by the present invention includes a collimating lens, a wavelength division multiplexer, a first filter, a second filter, a first optical fiber circulator, a second optical fiber 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 arranged between the first transceiver end and the wavelength division multiplexer; the input end of the wavelength division multiplexer is arranged at the focal position of the collimating lens, the output end of the wavelength division multiplexer is connected to the optical fiber end of the first optical fiber circulator through the first filter, and the output end of the wavelength division multiplexer is also connected to the optical fiber end of the second optical fiber circulator through the second filter; the transmitting end of the first optical fiber circulator is coupled to the second transceiver end for transmitting a laser beam of the first wavelength; the receiving end of the first optical fiber circulator is coupled to the third transceiver end for receiving a laser beam of the first wavelength; the transmitting end of the second optical fiber circulator is coupled to the fourth transceiver end for transmitting a laser beam of the second wavelength; the receiving end of the second optical fiber circulator is coupled to the fifth transceiver end for receiving a laser beam of the second wavelength; the first wavelength and the second wavelength are two wavelengths within any set wavelength range. Thus, it can be seen that the signal transceiver in the present invention can receive and transmit two wavelengths within the set wavelength range, broadening the wavelengths that can be received and transmitted to a wavelength range instead of being limited to only two specific wavelengths, thereby effectively solving the defect in the prior art that in a bidirectional beaconless laser communication device, due to the fact that the signal transceiver can only receive and transmit two specific wavelengths, the communication rate of the bidirectional beaconless laser communication device is relatively low, broadening the wavelength range of the signal transceiver for receiving and transmitting wavelengths and effectively improving the communication rate.

[0037] Figure 2 This is one of the structural schematic diagrams of the bidirectional beaconless laser communication device provided by the embodiments of the present invention. As Figure 2 shown, the bidirectional beaconless laser communication device includes: two such signal transceivers, a laser transceiver component, an optical transmission component, and a control unit.

[0038] See Figure 2, the laser transceiver assembly may include a primary mirror 1, a secondary mirror 2, and an eyepiece 3. Among them, the primary mirror 1 and the secondary mirror 2 are disposed opposite to each other, the secondary mirror 2 is disposed on the reflection optical path of the primary mirror 1, and the eyepiece is disposed on the reflection optical path of the secondary mirror 2.

[0039] In a specific implementation, the beam reduction magnification and beam expansion magnification of the laser transceiver assembly are 10 times, and the surface accuracy is less than or equal to 21 nm.

[0040] In a specific implementation, the focal length of the laser transceiver assembly may be 250 mm.

[0041] The optical transmission component is disposed on the first output optical path, and is configured to receive the laser beam emitted from the laser transceiver assembly and output the laser beam in two paths. As Figure 1 shown, one output is transmitted along the second output optical path, and the other output is transmitted along the third output optical path.

[0042] The two signal transceivers include a first signal transceiver 13 and a second signal transceiver 14.

[0043] The first signal transceiver 13 is disposed on the second output optical path and is configured 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 are not described in detail here.

[0044] The second signal transceiver 14 is disposed on the third output optical path and is configured to form a second optical receiving path or a second optical transmitting path with the optical transmission component. The second optical receiving path and the second optical transmitting path are described in detail later, and are not described in detail here.

[0045] The control unit ( Figure 2 not shown in the figure) is coupled to the first signal transceiver 13 and the second signal transceiver 14, and is configured to control the current state to be the first state or the second state.

[0046] In the first state, the control unit controls the first signal transceiver 13 to be a signal receiving end, and the second signal transceiver 14 to be a signal transmitting end. In this case, the optical receiving path is the first optical receiving path formed by the first signal transceiver 13 and the optical transmission component, and the optical transmitting path is the second optical transmitting path formed by the second signal transceiver 14 and the optical transmission component 13.

[0047] In the second state, the control unit controls the first signal transceiver 13 to be a signal transmitting end, and the second signal transceiver 14 to be a signal receiving end. The first signal transceiver 13 and the optical transmission component form a first optical transmitting path, and the second signal transceiver 14 and the optical transmission component form a second optical receiving path.

[0048] The wavelength ranges of the two wavelengths transmitted and received by the first signal transceiver 13 are different from the wavelength ranges of the two wavelengths transmitted and received by the second signal transceiver 14.

[0049] Exemplarily, the wavelength ranges of the two wavelengths transmitted and received by the first signal transceiver 13 can be 1537 nm to 1543 nm. In this case, the wavelength ranges of the two wavelengths transmitted and received by the second signal transceiver 14 are 1558 nm to 1564 nm.

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

[0051] The first signal transceiver 13 acts as a signal transmitter to transmit the first wavelength, and the second signal transceiver acts as a signal receiver to receive the second wavelength. In this case, a 100G transmission rate (i.e., a data transmission rate of 100 Gigabits per second) can be achieved.

[0052] The wavelength ranges of the two wavelengths transmitted and received by the first signal transceiver 13 are different from the wavelength ranges of the two wavelengths transmitted and received by the second signal transceiver. The first signal transceiver 13 can transmit two specific wavelengths within one wavelength range as a signal transmitter, and the first signal transceiver 14 can receive two specific wavelengths within another wavelength range as a signal receiver. In this case, by expanding the communication rate according to the corresponding wavelengths, the communication rate requirements of 800G and above can be met.

[0053] Next, the settings of the optical transmission component, and the process of the laser transceiver component, the optical transmission component, the first signal transceiver 13 and the second signal transceiver 14 cooperating to complete signal transmission and reception will be introduced.

[0054] Please continue to refer to Figure 2 , the optical transmission component may include: a first fast steering mirror 4, a first beam splitter 5, a dichroic mirror 6, a second fast steering mirror 7, a narrowband switch 8, a tracking lens group 9, and a tracking detector 10.

[0055] The first fast steering mirror 4 is arranged on the first outgoing optical path, the first beam splitter 5 is arranged on the reflected optical path of the first fast steering mirror 4, the dichroic mirror 6 is arranged on the transmitted optical path of the first beam splitter 5, the second fast steering mirror 7 is arranged on the reflected optical path of the dichroic mirror 6, the tracking detector 10 is arranged on the reflected optical path of the first beam splitter 5, and the tracking detector 10 is arranged at the focal position of the tracking lens group 9; the narrowband switch 8 is arranged between the first beam splitter 5 and the tracking lens group 9.

[0056] After the laser beam emitted from the laser transceiver assembly enters the first fast steering mirror 4 in the optical transmission assembly, it is reflected by the first fast steering mirror 4 and enters the first beam splitter 5. After passing through the first beam splitter 5 by transmission, it enters the narrowband switch 8. After being filtered by the narrowband switch 8, it enters the tracking lens group 9. After being focused by the tracking lens group 9, it enters the tracking detector 10, thereby establishing the initial optical axis. In this case, the first fast steering mirror 4 can be feedback adjusted through the tracking detector 10 to complete the calibration of the initial optical axis of the optical transmission assembly.

[0057] After the laser beam emitted from the laser transceiver assembly enters the first fast steering mirror 4 in the optical transmission assembly, it is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5. After passing through the first beam splitter 5 by transmission, it enters the dichroic mirror 6. After passing through the dichroic mirror 6 by transmission, it enters the first signal transceiver 13, thereby establishing the first optical receiving path.

[0058] After the laser beam emitted from the laser transceiver assembly enters the first fast steering mirror 4 in the optical transmission assembly, it is reflected by the first fast steering mirror 4 and then enters the first beam splitter 5. After passing through the first beam splitter 5 by transmission, it enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the second fast steering mirror 7. After being reflected by the second fast steering mirror 7, it enters the second signal transceiver 14, thereby establishing the second optical receiving path.

[0059] The first signal transceiver 13 can emit a first collimated beam with a first wavelength, and the second signal transceiver 14 can emit a second collimated beam with a second wavelength. In this case, the first signal transceiver 13 and the second signal transceiver 14 can complete the emission of optical signals.

[0060] Please continue to refer to Figure 1 , the first signal transceiver 13 can emit a first collimated beam to the dichroic mirror 6. After the first collimated beam enters the dichroic mirror 6, it passes through the dichroic mirror 6 by transmission and then enters the first beam splitter 5. After passing through the first beam splitter 5 by transmission, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver assembly, thereby forming the first optical emission path.

[0061] Please continue to refer to Figure 1 , the second signal transceiver 14 can emit a second collimated beam to the second fast steering mirror 7. After the second collimated beam enters the second fast steering mirror 7, it is reflected by the second fast steering mirror 7 and enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the first beam splitter 5. After passing through the first beam splitter 5 by transmission, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver assembly, thereby forming the second optical emission path.

[0062] It should be noted that the operating wavelengths of the first signal transceiver 13 and the second signal transceiver 14 are different. That is, the first wavelength and the second wavelength are different.

[0063] The operating wavelength of the first signal transceiver 13 is the first wavelength. The first signal transceiver 13 can emit a first collimated beam of the first wavelength and receive a laser beam of the first wavelength.

[0064] The operating wavelength of the second signal transceiver 14 is the second wavelength. The second signal transceiver 14 can emit a second collimated beam of the second wavelength and receive a laser beam of the second wavelength.

[0065] For the corresponding descriptions of the first wavelength and the second wavelength, refer to the above embodiments, and no further elaboration will be provided here.

[0066] Based on the first optical emission path, the first optical reception path, the second optical emission path, and the second optical reception path introduced above, the specific working process of the above bidirectional beaconless laser communication device will be introduced below.

[0067] Refer to Figure 2 As shown, the current state of the bidirectional beaconless laser communication device can be controlled to the first state by the control unit. In the first state, the first signal transceiver 13 acts as a signal transmitter to emit a first collimated beam to the dichroic mirror 6. After the first collimated beam enters the dichroic mirror 6, it is transmitted through the dichroic mirror 6 and enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver module and is emitted after beam expansion by the laser transceiver module, thus completing the signal transmission; the laser carrying the signal emitted from the external device enters the laser transceiver module, and after beam contraction by the laser transceiver module, a beam-contracted laser beam is obtained. This laser beam exits the laser transceiver module and enters the first fast steering mirror 4 in the optical transmission module. After being reflected by the first fast steering mirror 4, it enters the first beam splitter 5. After being transmitted through the first beam splitter 5, it enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the second fast steering mirror 7. After being reflected by the second fast steering mirror 7, it enters the second signal transceiver 14 acting as a signal receiver, and the signal is received by the second signal transceiver 14, thus completing the signal reception. In the first state, the laser beam received by the optical transmission module is reflected by the first fast steering mirror 4 and enters the first beam splitter 5. After being reflected by the first beam splitter 5, it enters the narrowband switch 8 for filtering to perform wavelength screening. The light of the second wavelength (the wavelength screened out here is the operating wavelength of the signal receiver. In the first state, the second signal transceiver 14 is the signal receiver, so the wavelength screened out is the second wavelength) enters the tracking lens group 9 and is focused by the tracking lens group 9 and then enters the tracking detector 10 to calibrate the initial optical axis based on the feedback of the tracking detector 10.

[0068] Please continue to refer to Figure 1As shown, the current state of the bidirectional beaconless laser communication device can be controlled by the control unit to the second state. In the second state, the second signal transceiver 14 acts as a signal transmitter to emit a second collimated beam to the second fast steering mirror 7. After the second collimated beam enters the second fast steering mirror 7, it is reflected by the second fast steering mirror 7 and enters the dichroic mirror 6. After being reflected by the dichroic mirror 6, it enters the first beam splitter 5. After passing through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the laser transceiver module, and the laser transceiver module emits the beam after beam expansion, thus completing the signal transmission; the laser carrying the signal emitted from the external device enters the laser transceiver module, and after being beam-reduced by the laser transceiver module, a beam-reduced laser beam is obtained. This laser beam exits the laser transceiver module and enters the first fast steering mirror 4 in the optical transmission module. After being reflected by the first fast steering mirror 4, it enters the first beam splitter 5. After passing through the first beam splitter 5, it enters the dichroic mirror 6. After passing through the dichroic mirror 6, it enters the first signal transceiver 13 acting as a signal receiver, and the signal is received by the first signal transceiver 13, thus completing the signal reception. In the second state, similar to the first state, the laser beam received by the optical transmission module is reflected by the first fast steering mirror 4 and enters the first beam splitter 5. After being reflected by the first beam splitter 5, it enters the narrowband switch 8 for filtering to screen the wavelength, and the light of the second wavelength is screened out (the wavelength screened out here is the operating wavelength of the signal receiver. In the first state, the second signal transceiver 14 is the signal receiver, so the wavelength screened out is the second wavelength) and enters the tracking lens group 9. After being focused by the tracking lens group 9, it enters the tracking detector 10 to calibrate the initial optical axis based on the feedback of the tracking detector 10.

[0069] In some embodiments, as Figure 3 shown, the bidirectional beaconless laser communication device may further include: an optical axis calibration component.

[0070] The optical axis calibration component includes an optical axis monitoring camera 11 and a second beam splitter 12.

[0071] The second beam splitter 12 is disposed between the first fast steering mirror 4 and the laser transceiver module, that is, between the first fast steering mirror 4 and the eyepiece 3.

[0072] The first fast steering mirror 4 is located on the transmission optical path of the second beam splitter 12, and the optical axis monitoring camera 11 is disposed on the reflection optical path of the second beam splitter 12.

[0073] See Figure 3, in the first state, the first signal transceiver 13 acts as a signal transmitter to emit a first collimated light beam to the dichroic mirror 6. After the first collimated light beam enters the dichroic mirror 6, it is transmitted through the dichroic mirror 6 and then enters the first beam splitter 5. After passing through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the second beam splitter 12. A part of the light transmitted through the second beam splitter 12 enters the laser transceiver module, and another part of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0074] In the second state, the second signal transceiver 14 acts as a signal transmitter to emit a second collimated light beam to the second fast steering mirror 7. After the second collimated light beam enters the second fast steering mirror 7, it is reflected by the second fast steering mirror 7 and then enters the dichroic mirror 6. After being transmitted through the dichroic mirror 6, it enters the first beam splitter 5. After passing through the first beam splitter 5, it enters the first fast steering mirror 4. After being reflected by the first fast steering mirror 4, it enters the second beam splitter 12. A part of the light transmitted through the second beam splitter 12 enters the laser transceiver module, and another part of the light reflected by the second beam splitter 12 enters the optical axis monitoring camera 11.

[0075] It can be seen that the optical axis monitoring camera 11 can receive the first collimated light beam and the second collimated light beam. In this case, the coaxiality of the optical axes in the first light receiving path and the second light receiving path can be detected through the optical axis monitoring camera 11, so as to calibrate the optical axes in the first light receiving path and the second light receiving path based on the detected results, and ensure the accuracy of the path and direction of the laser beam during transmission.

[0076] In a specific implementation, the transmittance - reflectance ratio of the second beam splitter 12 can be 99:1, the surface accuracy is ≤1 / 20λ@632.8nm, and the aperture can be 25mm. In this case, before the collimated light beam entering the first fast steering mirror 4 enters the laser transceiver module, it first enters the second beam splitter 12. After being transmitted through the second beam splitter 12, 99% of the transmitted energy enters the laser transceiver module, and 1% of the reflected energy enters the optical axis monitoring camera 11 for coaxiality detection of the optical axis.

[0077] In a specific implementation, the measurement accuracy of the optical axis monitoring camera 11 is less than 5urad, and the root - mean - square (RMS) surface accuracy is ≤80nm.

[0078] The relevant parameters of the first fast steering mirror 4 and the second fast steering mirror 7 are selected as follows: the working wavelength range is 1550±30nm, the reflectivity is greater than 98%, the angular resolution is ≤1μrad, the angular deviation range is ±3mrad, and the surface accuracy is ≤21nm.

[0079] The transmittance - reflectance ratio of the first beam splitter 5 can be 95:5, and the RMS surface accuracy is ≤80nm.

[0080] The switching accuracy of the narrowband switch 8 is less than 0.5°, and narrowband switching between the first wavelength and the second wavelength can be performed. For example, narrowband switching between two working wavelengths, i.e., the first working wavelength and the second working wavelength, can be carried out. The first working wavelength is any wavelength within the range of 1540 nm ± 3 nm, and the second working wavelength is any wavelength within the range of 1561 nm ± 3 nm.

[0081] The measurement accuracy of the tracking lens group 9 is less than 4 μrad, and the aperture can be 20 nm.

[0082] The wavelength range measured by the tracking detector 10 is 0.4 μm to 1.7 μm.

[0083] The coating of the dichroic mirror 6 can be, for example, a 1540 nm ± 3 nm reflective film with a reflectivity of 93%; and a 1563 nm ± 3 nm transmissive film with a transmittance of 93%.

[0084] The present invention provides a bidirectional beaconless laser communication device, which includes 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 collimate the laser carrying a signal and emit the collimated laser beam; the laser beam is transmitted along a first emission optical path; the optical transmission assembly is arranged on the first emission optical path and is used to receive the laser beam and output it in two paths; wherein, one path of the output is transmitted along a second emission optical path, and the other path of the output is transmitted along a third emission optical path; the first signal transceiver is arranged on the second emission optical path and is used to form a first optical receiving path or a first optical transmitting path with the optical transmission assembly; the second signal transceiver is arranged on the third emission optical path and is used to form a second optical receiving path or a second optical transmitting path with the optical transmission assembly; the control unit is coupled to the first signal transceiver and the second signal transceiver and is used to control the current state to be a first state or a second state; in the first state, the control unit controls the first signal transceiver to be a signal receiving end and controls the second signal transceiver to be a signal transmitting end, so that the first signal transceiver and the optical transmission assembly form a first optical receiving path, and the second signal transceiver and the optical transmission assembly form a second optical transmitting path; in the second state, the control unit controls the first signal transceiver to be a signal transmitting end and controls the second signal transceiver to be a signal receiving end, so that the first signal transceiver and the optical transmission assembly form a first optical transmitting path, and the second signal transceiver and the optical transmission assembly form a second optical receiving path; the working wavelengths of the first signal transceiver and the second signal transceiver are different. Among them, the signal transceiver includes a collimating lens, a wavelength division multiplexer, 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 arranged between the first transceiver end and the wavelength division multiplexer; the input end of the wavelength division multiplexer is arranged at the focal position of the collimating lens, the output end of the wavelength division multiplexer is connected to the fiber end of the first fiber optic circulator through the first filter, and the output end of the wavelength division multiplexer 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 and is used to emit a laser beam of a first wavelength; the receiving end of the first fiber optic circulator is coupled to the third transceiver end and is used to receive a laser beam of the first wavelength; the transmitting end of the second fiber optic circulator is coupled to the fourth transceiver end and is used to emit a laser beam of a second wavelength; the receiving end of the second fiber optic circulator is coupled to the fifth transceiver end and is used to receive a laser beam of the second wavelength; the first wavelength and the second wavelength are two wavelengths within any set wavelength range.It can be seen that the signal transceiver in the present invention can transmit and receive two wavelengths within a set wavelength range, broadening the wavelengths that can be transmitted and received to a wavelength range, rather than being limited to only two specific wavelengths. Thus, it effectively solves the defect in the prior art that in a bidirectional beaconless laser communication device, the communication rate of the bidirectional beaconless laser communication device is relatively low due to the fact that the signal transceiver can only transmit and receive two specific wavelengths, broadens the wavelength range of the signal transceiver for transmitting and receiving, and effectively improves the communication rate.

[0085] The bidirectional beaconless laser communication method provided by the present invention will be described below. The bidirectional beaconless laser communication method described below can be correspondingly referred to the bidirectional beaconless laser communication device described above.

[0086] The bidirectional beaconless laser communication method in the embodiments of the present invention is applied to the bidirectional beaconless laser communication device as introduced above.

[0087] The bidirectional beaconless laser communication method may include the following steps 1 to 3.

[0088] Step 1: Transmit a laser to the laser transceiver assembly, reduce the beam of the laser through the laser transceiver assembly to obtain a reduced laser beam, and transmit the laser beam to the optical transmission assembly through the laser transceiver assembly.

[0089] Step 2: Set the current state to the first state; in the case of the first state, establish a first optical receiving path based on the optical transmission assembly and the first signal transceiver; and, establish a second optical transmitting path based on the optical transmission assembly and the second signal transceiver.

[0090] Step 3: Set the current state to the second state; in the case of the second state, establish a second optical receiving path based on the optical transmission assembly and the second signal transceiver; and, establish a first optical transmitting path based on the optical transmission assembly and the first signal transceiver.

[0091] In some embodiments, the optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector. Based on the optical transmission component and the first signal transceiver, a first optical receiving path is established, including: reflecting a laser beam through the first beam splitter into the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; the first laser beam is reflected by the first beam splitter into the narrowband switch, enters the tracking lens group through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis. The second laser beam passes through the first beam splitter and enters the dichroic mirror, passes through the dichroic mirror and enters the first signal transceiver, completing the establishment of the first optical receiving path. Based on the optical transmission component and the second signal transceiver, a second optical transmitting path is established, including: the second signal transceiver emits a first collimated beam carrying a signal, the first collimated beam is reflected by the second fast steering mirror and then enters the dichroic mirror, passes through the dichroic mirror and enters the first beam splitter, passes through the first beam splitter and enters the first fast steering mirror, and is reflected by the first fast steering mirror and then enters the laser transceiver component, completing the establishment of the second optical transmitting path.

[0092] In some embodiments, based on the optical transmission component and the second signal transceiver, a second optical receiving path is established, including: reflecting a laser beam through the first beam splitter into the first beam splitter, and the first beam splitter divides the laser beam into a first laser beam and a second laser beam; the first laser beam is reflected by the first beam splitter into the narrowband switch, enters the tracking lens group through the narrowband switch, and is coupled to the tracking detector through the tracking lens group to establish a tracking optical axis; the second laser beam passes through the first beam splitter and enters the dichroic mirror, is reflected by the dichroic mirror and enters the second fast steering mirror, and is reflected by the second fast steering mirror and enters the second signal transceiver, completing the establishment of the second optical receiving path; based on the optical transmission component and the first signal transceiver, a first optical transmitting path is established, including: the first signal transceiver emits a second collimated beam carrying a signal, the second collimated beam passes through the dichroic mirror and then enters the first beam splitter, passes through the first beam splitter and enters the first fast steering mirror, and is reflected by the first fast steering mirror and then enters the laser transceiver component, completing the establishment of the first optical transmitting path.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A signal transceiver, characterized in that, Including: A collimating lens, a wavelength division multiplexer, a first filter, a second filter, a first optical fiber circulator, a second optical fiber circulator, a first transceiver, a second transceiver, a third transceiver, a fourth transceiver and a fifth transceiver; The collimating lens is arranged between the first transceiver and the wavelength division multiplexer; The input end of the wavelength division multiplexer is arranged at the focal position of the collimating lens. The output end of the wavelength division multiplexer is connected to the optical fiber end of the first optical fiber circulator through the first filter, and the output end of the wavelength division multiplexer is also connected to the optical fiber end of the second optical fiber circulator through the second filter; The transmitting end of the first optical fiber circulator is coupled to the second transceiver for transmitting a laser beam of a first wavelength; The receiving end of the first optical fiber circulator is coupled to the third transceiver for receiving the laser beam of the first wavelength; The transmitting end of the second optical fiber circulator is coupled to the fourth transceiver for transmitting a laser beam of a second wavelength; The receiving end of the second optical fiber circulator is coupled to the fifth transceiver for receiving the laser beam of the second wavelength; The first wavelength and the second wavelength are two wavelengths within any set wavelength range.

2. The signal transceiver according to claim 1, wherein The set wavelength range is 1537 nm to 1543 nm.

3. The signal transceiver according to claim 1, wherein The set wavelength range is 1558 nm to 1564 nm.

4. A bidirectional beaconless laser communication device, characterized in that Including: Two signal transceivers as described in claim 1, a laser transceiver assembly, an optical transmission assembly and a control unit; The laser transceiver assembly is used for collimating the laser carrying the signal and emitting the collimated laser beam; the laser beam is transmitted along a first output optical path; The optical transmission assembly is arranged on the first output optical path and is used for receiving the laser beam, transmitting the laser beam and outputting it in two paths; wherein, one path of output is transmitted along a second output optical path, and the other path of output is transmitted along a third output optical path; The first signal transceiver of the two signal transceivers is arranged on the second output optical path and is used for forming 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 arranged on the third output optical path and is used for forming a second optical receiving path or a second optical transmitting path with the optical transmission assembly; the wavelength ranges of the two wavelengths transmitted and received by the first signal transceiver are different from the wavelength ranges of the two wavelengths transmitted and received by the second signal transceiver. A control unit, coupled to the first signal transceiver and the second signal transceiver, is configured to control the current state to be a first state or a second state; in the first state, the control unit controls the first signal transceiver to be a signal receiving end and the second signal transceiver to be a signal transmitting end, the first signal transceiver and the optical transmission component form the first optical receiving path, and the second signal transceiver and the optical transmission component form the second optical transmitting path; in the second state, the control unit controls the first signal transceiver to be a signal transmitting end and the second signal transceiver to be a signal receiving end, the first signal transceiver and the optical transmission component form the first optical transmitting path, and the second signal transceiver and the optical transmission component form the second optical receiving path; in the first state or the second state, the operating wavelengths of the first signal transceiver and the second signal transceiver are different.

5. The two-way beaconless laser communication device according to claim 4, wherein, The optical transmission component includes a first fast steering mirror, a first beam splitter, a dichroic mirror, a second fast steering mirror, a narrowband switch, a tracking lens group, and a tracking detector; The first fast steering mirror is disposed on the first outgoing optical path, the first beam splitter is disposed on the reflected optical path of the first fast steering mirror, the dichroic mirror is disposed on the transmitted optical path of the first beam splitter, and the second fast steering mirror is disposed on the reflected optical path of the dichroic mirror; the tracking detector is disposed on the reflected optical path of the first beam splitter, the tracking lens group is disposed between the first beam splitter and the tracking detector; the narrowband switch is disposed between the first beam splitter and the tracking lens group.

6. The two-way beaconless laser communication device according to claim 5, characterized in that, Further included is: An optical axis alignment component; The optical axis alignment component includes an optical axis monitoring camera and a second beam splitter; The second beam splitter is disposed between the first fast steering mirror and the laser transceiver component, the first fast steering mirror is disposed on the transmitted optical path of the second beam splitter, and the optical axis monitoring camera is disposed on the reflected optical path of the second beam splitter.

7. The two-way beaconless laser communication device according to claim 4, wherein The laser transceiver component includes a primary mirror, a secondary mirror, and an eyepiece; The primary mirror and the secondary mirror are oppositely arranged, the secondary mirror is disposed on the reflected optical path of the primary mirror, and the eyepiece is disposed on the reflected optical path of the secondary mirror.

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