A switchable bidirectional beacon-free laser communication device and method

Abstract

The present invention relates to the field of laser communication technology, and proposes a switchable bidirectional beaconless laser communication device and method. The switchable bidirectional beaconless laser communication device includes a laser transceiver component and an optical communication unit. The optical communication unit includes a first optical transmission component, a second optical transmission component and a switching mirror component, and the first optical transmission component, the second optical transmission component and the switching mirror component are all located on the same side of the laser transceiver component, and the switching mirror component is located between the first optical transmission component and the second optical transmission component. The switching mirror assembly is suitable for switching between a first swing state and a second swing state. The switchable bidirectional beaconless laser communication device provided by the present invention enables the laser receiving system of the laser communication device to be switched and used according to actual needs, effectively improving the flexibility of the laser communication device when in use, improving the integration of the laser communication device, and meeting the integrated load requirements of laser communication.

Description

Technical Field

[0001] The present invention relates to the field of laser communication technology, and in particular to a switchable bidirectional beacon-free laser communication device and method. Background Art

[0002] With the rapid increase in demand for the Internet, laser communications have put forward increasingly higher demands on data transmission volume and transmission speed. The laser communication networks currently used mainly use optical fiber networks. Although the layout of optical fiber networks can increase data transmission volume and transmission speed, the layout of optical fiber networks is not only costly, but also has the risk of being damaged.

[0003] However, most of the existing laser communication devices are single-channel transmission. As the demand for laser communication increases, single-channel transmission laser communication devices have low flexibility in use and cannot meet the actual needs of laser communication. Summary of the invention

[0004] The present invention aims to solve at least one of the problems existing in the related art. To this end, the present invention proposes a switchable bidirectional beacon-free laser communication device, which can effectively improve the flexibility of the laser communication device when in use and meet the actual needs of laser communication.

[0005] The invention also provides a switchable bidirectional beacon-free laser communication method.

[0006] A switchable bidirectional beaconless laser communication device according to an embodiment of the first aspect of the present invention includes:

[0007] A laser transceiver assembly, used for reducing the beam of the laser carrying the signal to obtain a reduced laser beam;

[0008] An optical communication unit, comprising a first optical transmission component, a second optical transmission component and a switching mirror component, wherein the first optical transmission component, the second optical transmission component and the switching mirror component are all located on the same side of the laser transceiver component, and the switching mirror component is located between the first optical transmission component and the second optical transmission component;

[0009] The switching mirror assembly is suitable for switching between a first swinging state and a second swinging state, wherein, in the first swinging state, the first optical transmission assembly is located on the propagation optical path of the laser beam, and the laser transceiver assembly is suitable for transmitting the laser beam to the first optical transmission assembly so that the first optical transmission assembly receives the laser beam; in the second swinging state, the switching mirror assembly is located on the propagation optical path of the laser beam, the laser transceiver assembly is suitable for transmitting the laser beam to the switching mirror assembly, and the second optical transmission assembly is located on the reflection optical path of the switching mirror assembly so that the second optical transmission assembly receives the laser beam through the switching mirror assembly.

[0010] According to a switchable bidirectional beaconless laser communication device provided by an embodiment of the present invention, the first optical transmission component includes a first fast-reflection mirror, a second beam splitter and a first tracking camera; in the first swinging state, the first fast-reflection mirror is located in the propagation optical path of the laser beam, the second beam splitter is arranged between the first fast-reflection mirror and the first tracking camera, and the second beam splitter and the first tracking camera are both located in the reflection optical path of the first fast-reflection mirror;

[0011] The first optical transmission component also includes a first dichroic mirror, a first receiving lens and a first receiving detector; the first dichroic mirror is arranged between the second beam splitter and the first receiving lens, the first dichroic mirror and the first receiving lens are both located on the reflected light path of the second beam splitter, and the first receiving detector is arranged at the focus of the first receiving lens.

[0012] According to a switchable bidirectional beacon-free laser communication device provided by an embodiment of the present invention, the first optical transmission component also includes a first laser, the first laser is located on the reflected light path of the first dichroic mirror, and the first laser is suitable for emitting a collimated light beam carrying a signal to the first dichroic mirror.

[0013] According to a switchable bidirectional beaconless laser communication device provided by an embodiment of the present invention, the second optical transmission component includes a second fast reflex mirror, a third beam splitter and a second tracking camera; in the second swinging state, the second fast reflex mirror is located on the reflected light path of the switching mirror component, the third beam splitter is arranged between the second fast reflex mirror and the second tracking camera, and the third beam splitter and the second tracking camera are both located on the reflected light path of the second fast reflex mirror;

[0014] The second optical transmission component also includes a reflector, a second dichroic mirror, a second receiving lens and a second receiving detector; the reflector is located on the reflected light path of the third dichroic mirror, the second dichroic mirror is arranged between the reflector and the second receiving lens, the second dichroic mirror and the second receiving lens are both located on the reflected light path of the third dichroic mirror, and the second receiving detector is arranged at the focus of the second receiving lens.

[0015] According to a switchable bidirectional beacon-free laser communication device provided by an embodiment of the present invention, the second optical transmission component also includes a second laser, the second laser is located on the reflected light path of the second dichroic mirror, and the second laser is suitable for emitting a collimated light beam carrying a signal to the second dichroic mirror.

[0016] According to a switchable bidirectional beacon-free laser communication device provided by an embodiment of the present invention, the optical communication unit further includes:

[0017] An optical axis calibration component, comprising a calibration light source and a first beam splitter, wherein the calibration light source is suitable for emitting a calibration light beam, and the first beam splitter is located on a propagation optical path of the calibration light beam;

[0018] In the first swinging state, the first optical transmission component is located in the reflection light path of the first beam splitter; in the second swinging state, the switching mirror component is located in the reflection light path of the first beam splitter.

[0019] According to an embodiment of the present invention, a switchable bidirectional beaconless laser communication device is provided, wherein the laser transceiver assembly includes a primary mirror and a secondary mirror, the reflective surface of the primary mirror is a concave surface, the secondary mirror is arranged at the focus of the reflective surface of the primary mirror, and the reflective surface of the secondary mirror faces the optical communication unit.

[0020] According to a second aspect of the present invention, an embodiment provides a switchable bidirectional beaconless laser communication method, the switchable bidirectional beaconless laser communication method is based on any one of the switchable bidirectional beaconless laser communication devices described above, and the switchable bidirectional beaconless laser communication method comprises the following steps:

[0021] The laser is emitted to a laser transceiver assembly, and the laser is beam-contracted by the laser transceiver assembly to obtain a beam-contracted laser beam;

[0022] Switching the switch mirror assembly to a first swinging state, emitting a laser beam to a first optical transmission assembly, and establishing a first optical receiving path of the first optical transmission assembly;

[0023] Using the first optical transmission component to emit a first collimated light beam, and transmitting the first collimated light beam to the laser transceiver component through the first optical receiving path, and expanding and emitting the first collimated light beam through the laser transceiver component;

[0024] Or, switching the switch mirror assembly to a second swinging state, emitting the laser beam to the second optical transmission assembly, and establishing a second optical receiving path of the second optical transmission assembly;

[0025] The second collimated light beam is emitted by the second optical transmission component, and the second collimated light beam is transmitted to the laser transceiver component through the second optical receiving path, and the second collimated light beam is expanded and emitted through the laser transceiver component.

[0026] According to a switchable bidirectional beacon-free laser communication method provided by an embodiment of the present invention, the step of switching the switch mirror assembly to a first swinging state, emitting a laser beam to a first optical transmission assembly, and establishing a first optical receiving path of the first optical transmission assembly includes:

[0027] Switching the switch mirror assembly to a first swinging state, reflecting the laser beam through the first fast reflection mirror into the second beam splitter, and the second beam splitter splits the laser beam into a first laser beam and a second laser beam;

[0028] The first laser beam is transmitted through the second beam splitter and enters a first tracking camera, and a first tracking optical axis is established through the first tracking camera;

[0029] The second laser beam is reflected by the second beam splitter, enters the first color splitter, is transmitted through the first color splitter and enters the first receiving lens, and the second laser beam is coupled to the first receiving detector through the first receiving lens to establish a first light receiving path.

[0030] According to a switchable bidirectional beacon-free laser communication method provided by an embodiment of the present invention, the step of switching the switch mirror assembly to a second swinging state, emitting a laser beam to a second optical transmission assembly, and establishing a second optical receiving path of the second optical transmission assembly includes:

[0031] Switching the switching mirror assembly to a second swinging state, reflecting the laser beam through the switching mirror assembly and the second fast reflection mirror to the third beam splitter, wherein the third beam splitter splits the laser beam into a third laser beam and a fourth laser beam;

[0032] The third laser beam is transmitted through the second dichroic mirror and enters the second tracking camera, and a second tracking optical axis is established through the second tracking camera;

[0033] The fourth laser beam is reflected by the reflector, enters the second dichroic mirror, is transmitted through the second dichroic mirror and enters the second receiving lens. The fourth laser beam is coupled to the second receiving detector through the second receiving lens to establish a second light receiving path.

[0034] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0035] According to the switchable bidirectional beaconless laser communication device provided by the embodiment of the present invention, by switching the switching mirror assembly between the first swing state and the second swing state, the laser beam carrying the signal can enter the first optical transmission assembly or the second optical transmission assembly according to actual needs, so that the laser receiving system of the laser communication device can be switched and used according to actual needs, which effectively improves the flexibility of the laser communication device when in use, improves the integration of the laser communication device, and meets the integrated load requirements of laser communication.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic structural diagram of a switchable bidirectional beacon-free laser communication device provided in an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the self-test optical path of the optical axis calibration assembly provided by an embodiment of the present invention;

[0040] Figure 3 is a flow chart of a switchable bidirectional beacon-free laser communication method provided by an embodiment of the present invention;

[0041] Figure 4 It is a schematic structural diagram of a beacon-free laser communication device compatible with polarization-maintaining and non-polarization-maintaining provided by another embodiment of the present invention.

[0042] Reference numerals:

[0043] 1. Primary mirror; 2. Secondary mirror; 3. First beam splitter; 4. Switching mirror assembly; 5. First fast-return mirror; 6. Second beam splitter; 7. First tracking camera; 8. First color splitter; 9. First laser; 10. First receiving lens; 11. First receiving detector; 12. Second fast-return mirror; 13. Third beam splitter; 14. Second tracking camera; 15. Reflector; 16. Second color splitter; 17. Second laser; 18. Second receiving lens; 19. Second receiving detector; 20. Calibration light source; 26. Polarizer; 29. ​​Beam splitter; 36. Color splitter; 37. First emitting lens. DETAILED DESCRIPTION

[0044] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0047] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Combine the following Figure 1 to Figure 2 A switchable bidirectional beacon-free laser communication device provided by an embodiment of the present invention is described.

[0050] Figure 1 The schematic diagram of the structure of the switchable bidirectional beaconless laser communication device provided by the embodiment of the present invention is illustrated as follows: Figure 1 As shown, the switchable bidirectional beaconless laser communication device includes a laser transceiver component and an optical communication unit. The laser transceiver component is used to reduce the laser carrying the signal to obtain a reduced laser beam. The optical communication unit includes a first optical transmission component, a second optical transmission component and a switching mirror component 4, the first optical transmission component, the second optical transmission component and the switching mirror component 4 are all located on the same side of the laser transceiver component, and the switching mirror component 4 is located between the first optical transmission component and the second optical transmission component. The first optical transmission component is suitable as a laser signal receiving system or a laser signal transmitting system, and the second optical transmission component is suitable as a laser signal receiving system or a laser signal transmitting system.

[0051] The switch mirror assembly 4 is adapted to switch between a first swing state and a second swing state, wherein in the first swing state, the first optical transmission assembly is located on the propagation optical path of the laser beam, and the laser transceiver assembly is adapted to transmit the laser beam to the first optical transmission assembly so that the first optical transmission assembly receives the laser beam. In the second swing state, the laser transceiver assembly is adapted to transmit the laser beam to the switch mirror assembly 4, and the second optical transmission assembly is located on the reflection optical path of the switch mirror assembly 4 so that the second optical transmission assembly receives the laser beam through the switch mirror assembly 4.

[0052] According to the switchable bidirectional beaconless laser communication device provided in an embodiment of the present invention, when the switchable bidirectional beaconless laser communication device receives an external laser carrying a signal, the laser carrying the signal is reduced in size through a laser transceiver component to obtain a reduced laser beam.

[0053] When the first optical transmission component is used as a laser signal receiving system, the switching mirror component 4 is switched to the first swinging state, and the first optical transmission component is located on the propagation optical path of the shrunken laser beam. Then the laser transceiver component transmits the shrunken laser beam to the first optical transmission component, so that the first optical transmission component can receive the shrunken laser beam.

[0054] When the second optical transmission component is used as a laser signal receiving system, the switching mirror component 4 is switched to the second swinging state, at which time the switching mirror component 4 is located on the propagation optical path of the laser beam after the beam is reduced, and the laser transceiver component transmits the laser beam to the switching mirror component 4. Since the second optical transmission component is located on the reflection optical path of the switching mirror component 4, the laser beam after the beam is reduced enters the second optical transmission component after being reflected by the switching mirror component 4, so that the second optical transmission component can receive the laser beam after the beam is reduced.

[0055] That is, in the present invention, by switching the switching mirror assembly 4 between the first swing state and the second swing state, the laser beam carrying the signal can enter the first optical transmission assembly or the second optical transmission assembly according to actual needs, so that the laser receiving system of the laser communication device can be switched and used according to actual needs, which effectively improves the flexibility of the laser communication device during use, improves the integration of the laser communication device, and meets the integrated load requirements of laser communication.

[0056] It should be noted here that, in this embodiment, the switching mirror assembly 4 includes a laser reflector and a rotating shaft. One end of the laser reflector is fixedly mounted on the rotating shaft. The rotating shaft is connected to a driving component such as a motor. The rotation of the rotating shaft is controlled by the driving component, thereby driving the laser reflector to swing, so that the switching mirror assembly 4 switches between a first swinging state and a second swinging state.

[0057] When the switching mirror assembly 4 is in the first swinging state, the laser reflector is parallel to the propagation optical path of the laser beam to ensure that the first optical transmission assembly is located on the propagation optical path of the laser beam. When the switching mirror assembly 4 is in the second swinging state, the laser reflector is located on the propagation optical path of the laser beam, and the laser reflector and the propagation optical path of the laser beam form an angle of -45° to ensure that the switching mirror assembly 4 can reflect the laser beam to the second optical transmission assembly. By switching the first optical transmission assembly and the second optical transmission assembly through the switching mirror assembly 4, the switching accuracy of the first optical transmission assembly and the second optical transmission assembly can be effectively improved, thereby improving the flexibility of the first optical transmission assembly and the second optical transmission assembly when switching and using them.

[0058] In addition, in this embodiment, when the first optical transmission component and the second optical transmission component need to perform communication optical transmission at the same time, the switching mirror component is switched to the second swinging state, and the first optical transmission component is set on the transmission optical path of the switching mirror component, and the second optical transmission component is set on the reflection optical path of the switching mirror component, so that the first optical transmission component and the second optical transmission component can perform communication optical transmission at the same time.

[0059] It should also be noted here that the above-mentioned switching mirror assembly can use a waisted circular mirror with the following main performance parameters: switching accuracy better than 100urad, surface accuracy of the switching mirror ≤21nm, and a waisted circular mirror with an aperture of 25mm.

[0060] In an embodiment of the present invention, Figure 1 As shown, the laser transceiver assembly includes a primary mirror 1 and a secondary mirror 2, the reflective surface of the primary mirror 1 is a concave surface, the secondary mirror 2 is arranged at the focus of the reflective surface of the primary mirror 1, and the reflective surface of the secondary mirror 2 faces the optical communication unit.

[0061] When the laser transceiver assembly receives the external laser carrying a signal, the laser is irradiated to the reflective surface of the primary mirror 1. Since the reflective surface of the primary mirror 1 is a concave surface, when the parallel laser is irradiated to the reflective surface of the primary mirror 1, the primary mirror 1 can shrink the parallel laser and reflect the shrunken laser beam to the secondary mirror 2, which then reflects the laser beam to the optical communication unit to ensure that the optical communication unit can receive the laser beam carrying the signal.

[0062] It should be noted here that the beam expansion ratio and beam reduction ratio of the light shaping system composed of the primary mirror 1 and the secondary mirror 2 are both 10 times, and the surface accuracy of the light shaping system is ≤21nm.

[0063] In an embodiment of the present invention, Figure 1 As shown, the first optical transmission component includes a first fast reflex mirror 5, a second beam splitter 6 and a first tracking camera 7. When the switch mirror component 4 is in the first swinging state, the first fast reflex mirror 5 is located in the propagation optical path of the laser beam, the second beam splitter 6 is arranged between the first fast reflex mirror 5 and the first tracking camera 7, and the second beam splitter 6 and the first tracking camera 7 are both located in the reflection optical path of the first fast reflex mirror 5.

[0064] In this embodiment, when the first optical transmission component is used as the laser receiving system, the switching mirror component 4 is switched to the first swinging state. At this time, the first quick-reflection mirror 5 is located in the propagation optical path of the laser beam. The laser transceiver component emits the laser beam to the first quick-reflection mirror 5, and after reflection by the first quick-reflection mirror 5, the laser beam is reflected to the second beam splitter 6, and the laser beam is divided into a first laser beam and a second laser beam by the second beam splitter 6.

[0065] The first laser beam enters the first tracking camera 7 after being transmitted through the second beam splitter 6, and a first tracking optical axis is established through the first tracking camera 7 to improve the quality of the optical signal and the transmission reliability.

[0066] It should be noted here that the first optical transmission component and the second optical transmission component are both installed on the two-dimensional turntable. After the first laser beam enters the first tracking camera 7, the first tracking camera 7 controls the two-dimensional turntable to perform rough closed-loop control, that is, adjusts the orientation of the first tracking camera 7 and the first fast-reflecting mirror 5. The first tracking camera 7 then regenerates a new tracking camera window through software control and reduces the window size, and then forms a fine closed-loop control with the new tracking camera window and the first fast-reflecting mirror 5 to complete the capture and link building process, so as to suppress high-frequency noise in the optical signal and improve the quality and transmission reliability of the optical signal.

[0067] like Figure 1As shown, the first optical transmission component further includes a first dichroic mirror 8, a first receiving lens 10 and a first receiving detector 11. The first dichroic mirror 8 is arranged between the second beam splitter 6 and the first receiving lens 10, the first dichroic mirror 8 and the first receiving lens 10 are both located on the reflected light path of the second beam splitter 6, and the first receiving detector 11 is arranged at the focus of the first receiving lens 10.

[0068] The second laser beam enters the first dichroic mirror 8 after being reflected by the second beam splitter 6, and enters the first receiving lens 10 after being transmitted by the first dichroic mirror 8. The second laser beam is coupled to the first receiving detector 11 through the first receiving lens 10, thereby receiving the laser beam carrying the signal. The optical signal carried by the laser beam is converted into an electrical signal through the first receiving detector, thereby completing the processing of the laser beam.

[0069] In this embodiment, the laser beam is transmitted between the first fast reflection mirror 5, the second beam splitter 6, the first color separation mirror 8 and the first receiving lens 10, and the laser beam is received by the first receiving detector 11, so as to establish the first optical receiving path of the first optical transmission component, so that the first optical transmission component can receive the laser communication signal emitted by the external laser communication device.

[0070] Furthermore, if Figure 1 As shown, the first optical transmission component further includes a first laser 9, which is located on the reflection light path of the first dichroic mirror 8, and is suitable for emitting a collimated light beam carrying a signal to the first dichroic mirror 8. In this embodiment, the first laser can emit a collimated light beam of a specific wavelength, wherein the specific wavelength of the collimated light beam is 1540nm and 1563nm.

[0071] In this embodiment, when the first optical transmission component is used as the laser signal transmission system, the switching mirror component 4 is in the first swinging state, and the collimated light beam carrying the signal is transmitted to the first dichroic mirror 8 through the first laser 9. The collimated light beam enters the second dichroic mirror 6 after being reflected by the first dichroic mirror 8, and enters the first quick-reflection mirror 5 after being reflected by the second dichroic mirror 6, and then the collimated light beam is reflected to the laser transceiver component through the first quick-reflection mirror 5. At this time, the laser transceiver component can expand the collimated light beam, and send out the expanded communication light beam, and realize the communication link establishment between the first optical transmission component and the external laser communication device through the communication light beam, so that the first optical transmission component can send a laser communication signal to the external laser communication device, thereby completing the bidirectional beacon-free laser communication of the first optical transmission component.

[0072] In an embodiment of the present invention, Figure 1As shown, the second optical transmission component includes a second quick reflex mirror 12, a third beam splitter 13 and a second tracking camera 14. When the switch mirror assembly 4 is in the second swinging state, the second quick reflex mirror 12 is located on the reflected light path of the switch mirror assembly 4, the third beam splitter 13 is arranged between the second quick reflex mirror 12 and the second tracking camera 14, and the third beam splitter 13 and the second tracking camera 14 are both located on the reflected light path of the second quick reflex mirror 12.

[0073] In this embodiment, when the second optical transmission component is used as the laser receiving system, the switching mirror component 4 is switched to the second swinging state, and the switching mirror component 4 is located on the propagation optical path of the laser beam. The laser transceiver component transmits the laser beam to the switching mirror component 4, and then the laser beam is reflected by the switching mirror component 4 to the second fast reflection mirror 12. The laser beam is reflected by the second fast reflection mirror 12 to the third beam splitter 13, and the laser beam is divided into a third laser beam and a fourth laser beam by the third beam splitter 13.

[0074] The third laser beam enters the second tracking camera 14 after being transmitted through the third beam splitter 13, and a second tracking optical axis is established through the second tracking camera 14 to improve the quality of the optical signal and the transmission reliability.

[0075] It should be noted here that the process of establishing the second tracking optical axis is similar to the process of establishing the first tracking optical axis. At this time, coarse closed-loop control is performed through the second tracking camera 14 and the two-dimensional turntable, and the second tracking camera 14 and the second fast reflection mirror 12 form a fine closed-loop control to complete the capture and chain establishment process.

[0076] like Figure 1 As shown, the second optical transmission component also includes a reflector 15, a second dichroic mirror 16, a second receiving lens 18 and a second receiving detector 19. The reflector 15 is located on the reflected light path of the third beam splitter 13, the second dichroic mirror 16 is arranged between the reflector 15 and the second receiving lens 18, the second dichroic mirror 16 and the second receiving lens 18 are both located on the reflected light path of the third beam splitter 13, and the second receiving detector 19 is arranged at the focus of the second receiving lens 18.

[0077] The fourth laser beam is reflected by the third beam splitter 13 and enters the reflector 15. After being reflected by the reflector 15, the fourth laser beam is reflected to the second dichroic mirror 16, and the fourth laser beam is transmitted to the second receiving lens 18 through the second dichroic mirror 16. The fourth laser beam is coupled to the second receiving detector 19 through the second receiving lens 18, thereby realizing the reception of the laser beam carrying the signal.

[0078] In this embodiment, the second optical receiving path of the second optical transmission component is established by transmitting the laser beam among the switching mirror assembly 4, the second fast reflection mirror 12, the third beam splitter 13, the reflector 15, the second color separation mirror 16 and the first receiving lens 10, and the laser beam is received by the second receiving detector 19.

[0079] Furthermore, if Figure 1 As shown, the second optical transmission component further includes a second laser 17 . The second laser 17 is located on the reflected light path of the second dichroic mirror 16 . The second laser 17 is suitable for emitting a collimated light beam carrying a signal to the second dichroic mirror 16 .

[0080] In this embodiment, when the second optical transmission component is used as the laser signal transmission system, the switching mirror component 4 is in the second swinging state, and the second laser 17 transmits a collimated light beam carrying a signal to the second dichroic mirror 16. The collimated light beam is reflected by the second dichroic mirror 16 and enters the reflector 15, and then enters the third beam splitter 13 after being reflected by the reflector 15. Then the third beam splitter 13 reflects the collimated light beam to the second quick-reflection mirror 12, and the collimated light beam is reflected to the switching mirror component 4 through the second quick-reflection mirror 12, and finally the switching mirror component 4 reflects the collimated light beam to the laser transceiver component. At this time, the laser transceiver component can expand the collimated light beam and send out the expanded communication light beam, and realize the communication link establishment between the bidirectional beaconless laser communication device and the external laser communication device through the communication light beam, thereby completing the bidirectional beaconless laser communication of the second optical transmission component.

[0081] It should be noted that, in this embodiment, the wavelength of the collimated light source emitted by the first laser 9 is 1540 nm, and the wavelength of the collimated light source emitted by the second laser 17 is 1563 nm.

[0082] The first fast reflex mirror and the second fast reflex mirror may adopt fast reflex mirrors with the following main performance parameters: when the working band of the communication light is at the working band of 1550±30nm, the average reflectivity is greater than 98%, the RMS value of the angle resolution is ≤1μrad, the angle variation range is ±3mrad, and the surface accuracy is ≤21nm, such as the two-axis voice coil motor of model FSM-320Fast.

[0083] The first receiving lens and the second receiving lens may adopt lenses with the following main performance parameters: working wavelength 1050nm-1700nm, focal length 45mm, aperture 25.4mm, surface accuracy PV better than λ / 5@632.8nm, such as the AC54-045-C achromatic lens.

[0084] The detector end faces of the first receiving detector and the second receiving detector are 0.2 mm, for example, InGaAs APD of model C30659-1550-R2AH.

[0085] The second and third beam splitters can use beam splitters with a transmission / reflection ratio of 10:90 and a system surface accuracy of ≤21nm to meet tracking requirements and match the sensitivity of the detector.

[0086] The first tracking camera and the second tracking camera can adopt a 4-lens combination system, with a focal length of 300 mm, a system wave difference RMS of 42 nm, and a field of view range of ±1.5°.

[0087] The first dichroic mirror and the second dichroic mirror can be coated separately according to different wavelengths to complement each other. The light splitting of the first dichroic mirror 8 is 1540nm reflection (93%) and 1563nm transmission (93%); the light splitting of the second dichroic mirror 16 is 1540nm transmission (93%) and 1563nm reflection (93%).

[0088] The working wavelength of the reflector is 1500nm-1600nm, the reflectivity is better than 98%, and the surface accuracy RMS is better than λ / 30@632.8nm

[0089] In an embodiment of the present invention, Figure 2 The self-test optical path schematic diagram of the optical axis calibration assembly provided by the embodiment of the present invention is illustrated as follows: Figure 1 and Figure 2 As shown, the optical communication unit further includes an optical axis calibration component, which includes a calibration light source 20 and a first beam splitter 3. The calibration light source 20 is suitable for emitting a calibration light beam, and the first beam splitter 3 is located on the propagation light path of the calibration light beam. When the switching mirror component 4 is in a first swinging state, the first optical transmission component is located on the reflection light path of the first beam splitter 3. When the switching mirror component 4 is in a second swinging state, the switching mirror component 4 is located on the reflection light path of the first beam splitter 3.

[0090] Before irradiating the laser beam carrying the signal to the laser transceiver component, the calibration beam is irradiated to the first optical transmission component, and the first optical transmission component is feedback-adjusted to complete the initial optical axis calibration of the first optical transmission component; then the calibration beam is irradiated to the second optical transmission component, and the second optical transmission component is feedback-adjusted to complete the initial optical axis calibration of the second optical transmission component. This enables precise adjustment of the first optical transmission component and the second optical transmission component to ensure that the laser beam maintains the correct path and pointing accuracy during the propagation process.

[0091] Specifically, before the laser carrying the signal is irradiated to the laser transceiver assembly, and when the switch mirror assembly 4 is in the first swinging state, the calibration light source 20 is turned on and the calibration beam is emitted. The calibration beam is irradiated to the first beam splitter 3, and the calibration beam is reflected to the first fast reflection mirror 5 by the first beam splitter 3; then the calibration beam is reflected to the second beam splitter 6 and the first tracking camera 7 by the first fast reflection mirror 5 in sequence, and the first fast reflection mirror 5 is feedback-adjusted by the first tracking camera 7, thereby completing the initial optical axis calibration of the first optical transmission assembly.

[0092] When the switching mirror assembly 4 is in the second swinging state, the calibration light beam is reflected to the switching mirror assembly 4 through the first beam splitter 3, and then reflected to the second quick-reflection mirror 12 through the switching mirror assembly 4; then, the calibration light beam is reflected to the third beam splitter 13 and the second tracking camera 14 in sequence through the second quick-reflection mirror 12, and the switching mirror assembly 4 is feedback-adjusted through the second tracking camera 14, thereby completing the initial optical axis calibration of the second optical transmission component.

[0093] In this embodiment, the optical axis calibration component is used to perform initial optical axis calibration on the first optical transmission component and the second optical transmission component respectively, so that the switchable bidirectional beacon-free laser communication device has a self-checking function, thereby ensuring that the laser beam maintains the correct path and pointing accuracy during propagation.

[0094] It should be noted here that the reflection light path of the first beam splitter 3 is coaxial with the propagation light path of the laser beam, so as to improve the accuracy of the initial optical axis calibration of the first optical transmission component and the second optical transmission component.

[0095] It should also be noted that, in this embodiment, the first beam splitter adopts a waisted round mirror with a transmission-reflection ratio of 98:2, a system transmission surface accuracy of ≤21nm, and an aperture of 25nm.

[0096] Combine the following Figure 1 and Figure 2 The working process of a specific embodiment of the switchable bidirectional beacon-free laser communication device provided by the present invention is described.

[0097] Before irradiating the laser beam carrying the signal to the laser transceiver assembly, the switching mirror assembly 4 is switched to the first swinging state, and the calibration light source 20 is turned on, and the calibration light source 20 emits a calibration beam. The calibration beam is sequentially irradiated to the first beam splitter 3, the first fast-reflection mirror 5, the second beam splitter 6 and the first tracking camera 7, and the first fast-reflection mirror 5 is feedback-adjusted by the first tracking camera 7 to complete the initial optical axis calibration of the first optical transmission assembly.

[0098] Then, the switching mirror assembly 4 is switched to the second swinging state, and the calibration light beam is sequentially irradiated to the first beam splitter 3, the switching mirror assembly 4, the second fast reflection mirror 12, the third beam splitter 13 and the second tracking camera 14. The switching mirror assembly 4 is feedback-adjusted through the second tracking camera 14 to complete the initial optical axis calibration of the second optical transmission component.

[0099] When the first optical transmission component is used as the laser receiving system, the laser beam carrying the signal emitted by the external laser communication device is beam-contracted by the primary mirror 1, and the beam-contracted laser beam is emitted to the first optical transmission component by the secondary mirror 2. At this time, the swing angle of the switching mirror component 4 is switched to be parallel to the propagation optical path of the laser beam. For example, when the propagation optical path of the laser beam is horizontal, the switching mirror component 4 is set horizontally.

[0100] At the same time, the first fast reflection mirror 5 is located on the propagation optical path of the laser beam, and the beam-contracted laser beam is reflected by the first fast reflection mirror 5 and enters the second beam splitter 6. After passing through the second beam splitter 6, the laser beam is divided into a first laser beam and a second laser beam. Among them, the first laser beam enters the first tracking camera 7 to establish a first tracking optical axis.

[0101] The second laser beam is reflected by the second beam splitter 6, enters the first color splitter 8, is transmitted through the first color splitter 8, enters the first receiving lens 10, and is coupled to the first receiving detector 11 through the first receiving lens 10, thereby completing the establishment of the first optical receiving path of the first optical transmission component.

[0102] When the first optical transmission component is used as the laser emission system, the first laser 9 emits a first collimated light beam, which is reflected by the first dichroic mirror 8 and enters the second beam splitter 6, and then reflects to the first fast reflection mirror 5 after passing through the second beam splitter 6. After being reflected by the first fast reflection mirror 5, the first collimated light beam is transmitted to the secondary mirror 2, and then reflected to the primary mirror 1, and then the primary mirror 1 expands the first collimated light beam and emits it, so as to establish a communication link with the external laser communication device, and complete the bidirectional beacon-free laser communication of the first optical transmission component.

[0103] When the second optical transmission component is used as the laser receiving system, the laser beam carrying the signal emitted by the external laser communication device is beamed by the primary mirror 1, and the beamed laser beam is irradiated to the switching mirror component by the secondary mirror 2, and is reflected by the switching mirror component into the second optical transmission component. At this time, the swing angle of the switching mirror component 4 forms an angle of -45° with the propagation optical path of the laser beam.

[0104] At the same time, the switching mirror assembly 4 is located on the propagation optical path of the laser beam, and the beam-contracted laser beam is reflected by the switching mirror assembly 4 and enters the second fast-reflecting mirror 12, and is reflected by the second fast-reflecting mirror 12 to the third beam splitter 13. After passing through the third beam splitter 13, the laser beam is divided into a third laser beam and a fourth laser beam. Among them, the third laser beam enters the second tracking camera 14 to establish a second tracking optical axis.

[0105] The fourth laser beam is reflected by the third beam splitter 13, enters the reflector 15, is reflected by the reflector 15 to the second color splitter 16, is transmitted by the second color splitter 16 to enter the second receiving lens 18, is coupled to the second receiving detector 19 through the second receiving lens 18, and completes the establishment of the second optical receiving path of the second optical transmission component.

[0106] When the second optical transmission component is used as the laser emission system, the second laser 17 emits a second collimated light beam, which is reflected by the second dichroic mirror 16 and enters the reflector 15, and then enters the third beam splitter 13 after being reflected by the reflector 15, and then the third beam splitter 13 reflects the second collimated light beam to the second fast reflection mirror 12, and the second fast reflection mirror 12 reflects the second collimated light beam to the switching mirror component 4. After being reflected by the switching mirror component 4, the second collimated light beam is transmitted to the secondary mirror 2, and then after being reflected to the primary mirror 1, the primary mirror 1 expands the second collimated light beam and emits it, so as to establish a communication link with the external laser communication device, and complete the bidirectional beacon-free laser communication of the second optical transmission component.

[0107] Combine the following Figure 3 A switchable bidirectional beacon-free laser communication method provided by an embodiment of the second aspect of the present invention is described.

[0108] Figure 3 A flow chart illustrating a switchable bidirectional beacon-free laser communication method provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the switchable bidirectional beaconless laser communication method provided by the present invention is based on the switchable bidirectional beaconless laser communication device described in any one of the above embodiments, and the switchable bidirectional beaconless laser communication method comprises the following steps:

[0109] Step 100, emitting laser light to a laser transceiver assembly, and reducing the laser light through the laser transceiver assembly to obtain a reduced laser beam.

[0110] In this embodiment, the laser is irradiated to the reflective surface of the primary mirror 1 in the laser transceiver assembly, and the parallel laser can be beam-contracted by the primary mirror 1 to obtain the laser beam. The beam-contracted laser beam is reflected to the secondary mirror 2, and the laser beam is reflected to the optical communication unit by the secondary mirror 2 to ensure that the optical communication unit can receive the laser beam carrying the signal.

[0111] Step 210, switching the switch mirror assembly 4 to a first swinging state, emitting a laser beam to the first optical transmission assembly, and establishing a first optical receiving path of the first optical transmission assembly.

[0112] In this embodiment, when the first optical transmission component is used as a laser receiving system, the switching mirror component 4 is switched to a first swinging state, and the first optical transmission component is located on the propagation optical path of the laser beam. The first optical transmission component receives the laser beam emitted by the laser transceiver component and establishes a first optical receiving path.

[0113] Step 310, using the first optical transmission component to emit a collimated light beam, and transmitting the collimated light beam to the laser transceiver component through the first optical receiving path, and the collimated light beam is expanded and emitted through the laser transceiver component.

[0114] In this embodiment, when the first optical transmission component is used as a laser emission system, a collimated light beam is emitted by the first optical transmission component, and the collimated light beam is expanded and emitted by the laser transceiver component, thereby effectively realizing the communication link establishment between the first optical transmission component and the external laser communication device, thereby completing the two-way beacon-free laser communication of the first optical transmission component.

[0115] Or, step 220, switching the switch mirror assembly 4 to a second swinging state, emitting the laser beam to the second optical transmission assembly, and establishing a second optical receiving path of the second optical transmission assembly.

[0116] In this embodiment, when the second optical transmission component is used as the laser receiving system, the switching mirror component 4 is placed in a second swinging state, and the switching mirror component 4 is located on the propagation optical path of the laser beam. The laser beam is reflected to the second optical transmission component through the switching mirror component 4, so that the second optical transmission component receives the laser beam emitted by the laser transceiver component and establishes a second optical receiving path.

[0117] Step 320, using the second optical transmission component to emit a collimated light beam, and transmitting the collimated light beam to the laser transceiver component through the second optical receiving path, and the collimated light beam is expanded and emitted through the laser transceiver component.

[0118] In this embodiment, when the second optical transmission component is used as a laser emission system, a collimated light beam is emitted by the second optical transmission component, and the collimated light beam is expanded and emitted by the laser transceiver component, thereby effectively realizing the communication link establishment between the second optical transmission component and the external laser communication device, thereby completing the two-way beacon-free laser communication of the first optical transmission component.

[0119] In an embodiment of the present invention, before the step of emitting laser light to a laser transceiver assembly and reducing the laser light through the laser transceiver assembly to obtain a reduced laser beam, the step further includes:

[0120] Step 110, performing an initial optical axis calibration on the first optical transmission component, and performing an initial optical axis calibration on the second optical transmission component.

[0121] In this embodiment, initial optical axis calibration is performed on the first optical transmission component and the second optical transmission component respectively to achieve precise adjustment of the first optical transmission component and the second optical transmission component, so as to ensure that the laser beam can maintain the correct path and pointing accuracy during propagation.

[0122] Specifically, step 110 includes the following steps:

[0123] Step 111, switch the switching mirror assembly 4 to the first swinging state, turn on the calibration light source 20, irradiate the calibration light beam to the first beam splitter 3, and reflect the calibration light beam to the first quick reflection mirror 5 through the first beam splitter 3, and reflect the calibration light beam to the second beam splitter 6 and the first tracking camera 7 in sequence through the first quick reflection mirror 5.

[0124] Step 112, adjusting the swing angle of the first fast reflection mirror 5 through the feedback of the first tracking camera 7, and completing the initial optical axis calibration of the first optical transmission component.

[0125] Step 113, switch the switching mirror assembly 4 to the second swinging state, the calibration beam is reflected to the switching mirror assembly 4 through the first beam splitter 3, and the calibration beam is reflected to the second fast reflection mirror 12 through the switching mirror assembly 4; then, the calibration beam is reflected to the third beam splitter 13 and the second tracking camera 14 in sequence through the second fast reflection mirror 12.

[0126] Step 114, adjusting the switching mirror assembly 4 through feedback from the second tracking camera 14, to complete the initial optical axis calibration of the second optical transmission assembly.

[0127] In an embodiment of the present invention, the step of switching the switch mirror assembly 4 to the first swinging state, emitting the laser beam to the first optical transmission assembly, and establishing the first optical receiving path of the first optical transmission assembly includes the following steps:

[0128] Step 311, switch the switch mirror assembly 4 to the first swing state, reflect the laser beam through the first fast reflection mirror 5 and enter the second beam splitter 6, and the second beam splitter 6 splits the laser beam into a first laser beam and a second laser beam.

[0129] Step 312: the first laser beam is transmitted through the second beam splitter 6 and enters the first tracking camera 7. A first tracking optical axis is established through the first tracking camera 7, thereby improving the quality of the optical signal and the transmission reliability.

[0130] Step 313, the second laser beam is reflected by the second beam splitter 6, enters the first color splitter 8, is transmitted through the first color splitter 8 and enters the first receiving lens 10, and the second laser beam is coupled to the first receiving detector 11 through the first receiving lens 10, and a first optical receiving path is established to realize the reception of the laser beam carrying the signal.

[0131] In this embodiment, when the first optical transmission component is used as a laser receiving system, the laser beam is transmitted between the first fast reflection mirror 5, the second beam splitter 6, the first color separation mirror 8 and the first receiving lens 10, and the laser beam is received by the first receiving detector 11, so as to establish the first optical receiving path of the first optical transmission component, so that the first optical transmission component can receive the laser communication signal emitted by the external laser communication device.

[0132] Furthermore, the steps of emitting a collimated light beam by using a first optical transmission component, transmitting the collimated light beam to a laser transceiver component through a first optical receiving path, and expanding and emitting the first collimated light beam through the laser transceiver component include:

[0133] Step 411 , switching the switch mirror assembly 4 to a first swinging state, and emitting a first collimated light beam through the first laser 9 .

[0134] Step 412 , the first collimated light beam is reflected by the first dichroic mirror 8 into the second beam splitter 6 , and then reflected by the second beam splitter 6 into the first fast reflection mirror 5 .

[0135] Step 413, the first collimated light beam is reflected by the first fast reflection mirror 5 into the secondary mirror 2, and then reflected by the secondary mirror 2 into the primary mirror 1, and the collimated light beam is expanded and emitted through the primary mirror 1.

[0136] In this embodiment, when the first optical transmission component is used as the laser signal transmission system, the switching mirror component 4 is switched to the first swinging state, and the first collimated light beam is emitted by the first laser 9, and the first collimated light beam is transmitted to the laser transceiver component through the first color splitter 8, the second beam splitter 6, and the first fast reflection mirror 5, and the first collimated light beam is expanded and emitted by the laser transceiver component to realize the communication link establishment between the first optical transmission component and the external laser communication device, so that the first optical transmission component can send a laser communication signal to the external laser communication device, thereby completing the bidirectional beacon-free laser communication of the first optical transmission component.

[0137] In an embodiment of the present invention, the step of switching the switch mirror assembly 4 to the second swinging state, emitting the laser beam to the second optical transmission assembly, and establishing the second optical receiving path of the second optical transmission assembly includes:

[0138] Step 321, switch the switch mirror assembly 4 to the second swing state, reflect the laser beam through the switch mirror assembly 4 and the second fast reflection mirror 12 to the third beam splitter 13, and the third beam splitter 13 splits the laser beam into a third laser beam and a fourth laser beam.

[0139] Step 322 , the third laser beam is transmitted through the second dichroic mirror 16 and enters the second tracking camera 14 , and a second tracking optical axis is established through the second tracking camera 14 , thereby improving the quality of the optical signal and the transmission reliability.

[0140] Step 323, the fourth laser beam is reflected by the reflector 15, enters the second dichroic mirror 16, is transmitted through the second dichroic mirror 16 and enters the second receiving lens 18, and the fourth laser beam is coupled to the second receiving detector 19 through the second receiving lens 18, and a second optical receiving path is established to realize the reception of the laser beam carrying the signal.

[0141] In this embodiment, when the second optical transmission component is used as a laser receiving system, the laser beam is transmitted between the switching mirror component 4, the second fast reflection mirror 12, the third beam splitter 13, the reflector 15, the second color separation mirror 16, and the second receiving lens 18, and the laser beam is received by the second receiving detector 19, so as to establish a second optical receiving path of the second optical transmission component, so that the second optical transmission component can receive the laser communication signal emitted by the external laser communication device.

[0142] Furthermore, the steps of emitting a second collimated light beam by using a second optical transmission component, transmitting the second collimated light beam to a laser transceiver component through a second optical receiving path, and expanding and emitting the second collimated light beam through the laser transceiver component include:

[0143] Step 410 , switching the switch mirror assembly 4 to a second swinging state, and emitting a second collimated light beam through the second laser 17 .

[0144] Step 420 , the second collimated light beam is reflected by the second dichroic mirror 16 into the reflector 15 , enters the third beam splitter 13 through the reflector 15 , is reflected by the third beam splitter 13 into the second quick reflection mirror 12 , and is reflected by the second quick reflection mirror 12 into the switching mirror assembly 4 .

[0145] Step 430 , the second collimated light beam is reflected by the switching mirror assembly 4 into the secondary mirror 2 , and then reflected by the secondary mirror 2 into the primary mirror 1 , and the collimated light beam is expanded and emitted through the primary mirror 1 .

[0146] In this embodiment, when the second optical transmission component is used as the laser signal transmission system, the switching mirror assembly 4 is switched to the second swinging state, and the second collimated light beam is emitted by the second laser 17, and the second collimated light beam is transmitted to the laser transceiver assembly through the second color splitter 16, the reflector 15, the third beam splitter 13, the second fast mirror 12 and the switching mirror assembly 4, and the second collimated light beam is expanded and emitted by the laser transceiver assembly to realize the communication link establishment between the second optical transmission component and the external laser communication device, so that the second optical transmission component can send a laser communication signal to the external laser communication device, thereby completing the two-way beacon-free laser communication of the second optical transmission component.

[0147] Combine the following Figure 4 A beacon-free laser communication device compatible with polarization-maintaining and non-polarization-maintaining is described in another embodiment of the present invention.

[0148] Figure 4A schematic diagram of the structure of a non-beacon laser communication device compatible with polarization-maintaining and non-polarization-maintaining provided by another embodiment of the present invention is illustrated. Figure 4 As shown, when the communication light input into the laser transceiver assembly is divided into polarization-maintaining light and non-polarization-maintaining light, in order to separately receive the two types of communication light, the beacon-free laser communication device compatible with polarization-maintaining and non-polarization-maintaining includes a laser transceiver assembly, a polarization-maintaining light transmission assembly, a non-polarization-maintaining light transmission assembly, and a switching mirror assembly 4. The laser transceiver assembly is used to reduce the beam of the laser carrying the signal to obtain a reduced laser beam, and the polarization-maintaining light transmission assembly and the non-polarization-maintaining light transmission assembly are both located on the same side of the laser transceiver assembly. In this embodiment, the polarization-maintaining light transmission assembly is suitable for use as an optical signal receiving system or an optical signal transmitting system for polarization-maintaining light, and the non-polarization-maintaining light transmission assembly is suitable for use as an optical signal receiving system or an optical signal transmitting system for non-polarization-maintaining light.

[0149] The polarization-maintaining light transmission component includes a first quick-reflection mirror 5, a polarizer 26, a second beam splitter 6, a beam splitter prism 29 and a first light receiving element. The polarizer 26 and the second beam splitter 6 are both located on the reflected light path of the first quick-reflection mirror 5, the polarizer 26 is arranged between the first quick-reflection mirror 5 and the second beam splitter 6, the beam splitter prism 29 and the first light receiving element are arranged on the reflected light path of the second beam splitter 6, and the beam splitter prism 29 is arranged between the second beam splitter 6 and the first light receiving element.

[0150] The switching mirror assembly 4 is located between the polarization-maintaining light transmission assembly and the non-polarization-maintaining light transmission assembly, and the switching mirror assembly 4 is suitable for switching between a first swinging state and a second swinging state. When the switching mirror assembly 4 is in the first swinging state, the first fast-reflecting mirror 5 is located on the transmission optical path of the laser beam. When the switching mirror assembly 4 is in the second swinging state, the switching mirror assembly 4 is located on the transmission optical path of the laser beam, and the non-polarization-maintaining light transmission assembly is located on the reflection optical path of the switching mirror assembly 4.

[0151] According to the beacon-free laser communication device compatible with polarization-maintaining and non-polarization-maintaining provided by an embodiment of the present invention, when receiving a communication laser carrying an external signal, the laser transceiver component can shrink the communication laser to obtain a shrunken laser beam.

[0152] When the communication laser is a polarization-maintaining light that can maintain a stable state, the polarization-maintaining light transmission component is used as the laser signal receiving system. The switching mirror component 4 is switched to the first swinging state. At this time, the first quick-reflection mirror 5 is located on the transmission optical path of the laser beam, so that the laser transceiver component irradiates the laser beam after beam contraction to the first quick-reflection mirror 5. After being reflected by the first quick-reflection mirror 5, the laser beam is reflected to the polarizer 26. In this embodiment, the polarizer 26 is a quarter-wave plate. Through the transmission of the laser beam by the quarter-wave plate, the polarization state of the laser beam is changed, and the circularly polarized light in the laser beam is converted into linearly polarized light.

[0153] The laser beam is transmitted to the second beam splitter 6 via the polarizer 26 and is split into a first laser beam and a second laser beam by the second beam splitter 6 .

[0154] Among them, the first laser beam enters the beam splitter prism 29 after being reflected by the second beam splitter 6, and the incident laser beam is split into P polarized light and S polarized light by the beam splitter prism 29, so as to achieve screening of the laser beam, thereby receiving polarized light according to actual needs. In this embodiment, the P polarized light is transmitted to the first light receiving element through the beam splitter prism 29, thereby completing the establishment of the first light receiving path of the polarization-maintaining light transmission component.

[0155] When the communication laser is a non-polarization-maintaining light that cannot maintain a stable state, the non-polarization-maintaining light transmission component is used as the laser signal receiving system. The switching mirror component 4 switches to the second swinging state. At this time, the switching mirror component 4 is located on the propagation optical path of the laser beam, and the laser transceiver component transmits the laser beam to the switching mirror component 4. At this time, since the non-polarization-maintaining light transmission component is located on the reflection optical path of the switching mirror component 4, the laser beam enters the non-polarization-maintaining light transmission component after being reflected by the switching mirror component 4, so that the non-polarization-maintaining light transmission component receives the laser beam after beam reduction, thereby completing the establishment of the second optical receiving path of the non-polarization-maintaining light transmission component.

[0156] That is, in the present invention, by switching the switching mirror assembly 4 between the first swing state and the second swing state, the laser communication device can receive the received communication laser accordingly according to the polarization state, and process the communication laser accordingly, so that the laser communication device can be switched and used according to actual needs, thereby improving the flexibility of the laser communication device when in use, improving the integration of the laser communication device, and meeting the integrated load requirements of laser communication.

[0157] Furthermore, if Figure 4 As shown, the first light receiving element includes a first receiving lens 10 and a first receiving detector 11. The first receiving lens 10 is located on the reflection light path of the second beam splitter 6, and the beam splitter prism 29 is located between the first receiving lens 10 and the second beam splitter 6. The first receiving detector 11 is set at the focus of the first receiving lens 10. The laser beam screened by the beam splitter prism 29 is received and coupled by the first receiving lens 10, and the coupled laser beam is received by the first receiving detector 11, so as to realize the conversion of the communication signal carried by the laser beam into an electrical signal, thereby completing the processing of the laser beam.

[0158] Furthermore, the polarization-maintaining light transmission component further includes a first tracking camera 7, which is located on the transmission light path of the second beam splitter 6. After the second beam splitter 6 splits the laser beam into the first laser beam and the second laser beam, the second laser beam enters the first tracking camera 7 after being transmitted through the second beam splitter 6, and a first tracking optical axis is established through the first tracking camera 7 to improve the quality of the optical signal and the transmission reliability.

[0159] It should be noted that both the polarization-maintaining optical transmission component and the non-polarization-maintaining optical transmission component are installed on the two-dimensional turntable. After the second laser beam enters the first tracking camera 7, the first tracking camera 7 controls the two-dimensional turntable to perform coarse closed-loop control, that is, adjusts the orientation of the first tracking camera 7 and the first fast mirror 5. At the same time, the first tracking camera 7 regenerates a new tracking camera window and reduces the window size, and then forms a fine closed-loop control with the new tracking window and the first fast mirror 5 to complete the capture and link building process, so as to suppress the high-frequency noise in the optical signal and improve the quality and transmission reliability of the optical signal.

[0160] According to the beacon-free laser communication device compatible with polarization-maintaining and non-polarization-maintaining of this embodiment, the first optical receiving path of the polarization-maintaining optical transmission component is established by transmitting the laser beam between the first fast reflection mirror 5, the polarizer, the second beam splitter 6, the beam splitter prism 29 and the first receiving lens 10, and the laser beam is received and processed by the first receiving detector 11, so that the polarization-maintaining optical transmission component can receive and process the laser communication signal emitted by the external laser communication device.

[0161] In an embodiment of the present invention, Figure 4 As shown, the polarization-maintaining light transmission component further includes a first laser 9, which is located on the reflection light path of the beam splitter prism 29, and the first laser 9 is suitable for emitting a collimated light beam carrying a signal to the first laser 9. In this embodiment, the first laser 9 can emit a collimated light beam of a specific wavelength, wherein the specific wavelength of the collimated light beam is 1540nm and 1563nm.

[0162] In this embodiment, when the polarization-maintaining optical transmission component is used as the laser signal transmission system, the switching mirror component 4 is in the first swinging state, and the collimated light beam carrying the signal is emitted to the beam splitter prism 29 through the first laser 9. The collimated light beam enters the second beam splitter 6 after being reflected by the beam splitter prism 29. After being reflected by the second beam splitter 6, the collimated light beam enters the polarizer 26 and the first quick-reflection mirror 5 in sequence, and then the collimated light beam is reflected to the laser transceiver component by the first quick-reflection mirror 5. At this time, the laser transceiver component can expand the collimated light beam and send out the expanded communication light beam, and realize the communication link establishment between the polarization-maintaining optical transmission component and the external laser communication device through the communication light beam, so that the polarization-maintaining optical transmission component can send a laser communication signal to the external laser communication device, thereby completing the bidirectional beacon-free laser communication of the polarization-maintaining optical transmission component.

[0163] In the embodiment of the present invention, the non-polarization-maintaining light transmission component includes a second fast reflex mirror 12, a third beam splitter 13, a dichroic mirror 36, a second receiving lens 18, and a second receiving detector 19. The third beam splitter 13 is located on the reflected light path of the second fast reflex mirror 12, the dichroic mirror 36 is located on the reflected light path of the third beam splitter 13, the second receiving lens 18 is located on the reflected light path of the dichroic mirror 36, and the second receiving detector 19 is arranged at the focus of the second receiving lens 18. When the switching mirror assembly 4 is in the second swinging state, the second fast reflex mirror 12 is located on the reflected light path of the switching mirror assembly 4.

[0164] Furthermore, when the communication laser is a non-polarization-maintaining light that cannot maintain a stable state, the switching mirror assembly 4 is switched to the second swinging state, and at this time, the switching mirror assembly 4 is located on the propagation optical path of the laser beam. The laser transceiver assembly emits the laser beam to the switching mirror assembly 4, and then the laser beam is reflected by the switching mirror assembly 4 to the second fast reflection mirror 12. After being reflected by the second fast reflection mirror 12, the laser beam is reflected to the third beam splitter 13, and the laser beam is divided into a third laser beam and a fourth laser beam by the third beam splitter 13.

[0165] Among them, the third laser beam enters the color dichroic mirror 36 after being reflected by the third beam splitter 13, and the color dichroic mirror 36 reflects the light of a specific band in the laser beam to the second receiving lens 18. The second receiving lens 18 couples the light of the specific band to the second receiving detector 19. After the second receiving detector 19 converts the optical signal into an electrical signal, the specific communication signal carried in the laser beam is received and processed.

[0166] Furthermore, the non-polarization-maintaining light transmission component further includes a second tracking camera 14, which is located on the transmission light path of the third beam splitter 13. After the third beam splitter 13 splits the laser beam into a third laser beam and a fourth laser beam, the fourth laser beam enters the second tracking camera 14 after being transmitted through the third beam splitter 13, and a second tracking optical axis is established through the second tracking camera 14, so as to improve the quality of the optical signal and the transmission reliability.

[0167] In an embodiment of the present invention, the non-polarization-maintaining light transmission component further includes a second laser 17 and a first emitting lens 37, wherein the first emitting lens 37 is located on the transmission light path of the dichroic mirror 36, and the second laser 17 is arranged at the focus of the first emitting lens 37, and the second laser 17 is suitable for emitting a communication light beam to the first emitting lens 37. In this embodiment, the second laser 17 emits linearly polarized light, and the wavelength of the linearly polarized light emitted by the second laser 17 can be switched between 1540 nm and 1563 nm.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A switchable bidirectional beaconless laser communication device, It is characterized in that include: A laser transceiver assembly, used for reducing the beam of the laser carrying the signal to obtain a reduced laser beam; An optical communication unit, comprising a first optical transmission component, a second optical transmission component and a switching mirror component, wherein the first optical transmission component, the second optical transmission component and the switching mirror component are all located on the same side of the laser transceiver component, and the switching mirror component is located between the first optical transmission component and the second optical transmission component; The switching mirror assembly is suitable for switching between a first swinging state and a second swinging state, wherein, in the first swinging state, the first optical transmission assembly is located on the propagation optical path of the laser beam, and the laser transceiver assembly is suitable for transmitting the laser beam to the first optical transmission assembly so that the first optical transmission assembly receives the laser beam; in the second swinging state, the switching mirror assembly is located on the propagation optical path of the laser beam, and the laser transceiver assembly is suitable for transmitting the laser beam to the switching mirror assembly, the first optical transmission assembly is arranged on the transmission optical path of the switching mirror assembly, and the second optical transmission assembly is located on the reflection optical path of the switching mirror assembly, so that the first optical transmission assembly and the second optical transmission assembly simultaneously perform communication optical transmission.

2. The switchable bidirectional beaconless laser communication device according to claim 1, It is characterized in that The first optical transmission component includes a first fast-reflection mirror, a second beam splitter and a first tracking camera; in the first swinging state, the first fast-reflection mirror is located in the propagation optical path of the laser beam, the second beam splitter is arranged between the first fast-reflection mirror and the first tracking camera, and the second beam splitter and the first tracking camera are both located in the reflection optical path of the first fast-reflection mirror; The first optical transmission assembly also includes a first dichroic mirror, a first receiving lens and a first receiving detector; The first dichroic mirror is arranged between the second beam splitter and the first receiving lens. The first dichroic mirror and the first receiving lens are both located on the reflected light path of the second beam splitter. The first receiving detector is arranged at the focus of the first receiving lens.

3. The switchable bidirectional beaconless laser communication device according to claim 2, It is characterized in that The first optical transmission component further comprises a first laser, which is located in the reflected light path of the first dichroic mirror, and is suitable for emitting a collimated light beam carrying a signal to the first dichroic mirror.

4. The switchable bidirectional beaconless laser communication device according to claim 1, It is characterized in that The second optical transmission component includes a second fast reflex mirror, a third beam splitter and a second tracking camera; in the second swinging state, the second fast reflex mirror is located on the reflected light path of the switching mirror component, the third beam splitter is arranged between the second fast reflex mirror and the second tracking camera, and the third beam splitter and the second tracking camera are both located on the reflected light path of the second fast reflex mirror; The second optical transmission component also includes a reflector, a second dichroic mirror, a second receiving lens and a second receiving detector; the reflector is located on the reflected light path of the third dichroic mirror, the second dichroic mirror is arranged between the reflector and the second receiving lens, the second dichroic mirror and the second receiving lens are both located on the reflected light path of the third dichroic mirror, and the second receiving detector is arranged at the focus of the second receiving lens.

5. The switchable bidirectional beaconless laser communication device according to claim 4, It is characterized in that The second optical transmission component further comprises a second laser, which is located in the reflected light path of the second dichroic mirror, and is suitable for emitting a collimated light beam carrying a signal to the second dichroic mirror.

6. A switchable bidirectional beaconless laser communication device according to any one of claims 1 to 5, It is characterized in that The optical communication unit further includes: An optical axis calibration component, comprising a calibration light source and a first beam splitter, wherein the calibration light source is suitable for emitting a calibration light beam, and the first beam splitter is located on a propagation optical path of the calibration light beam; In the first swinging state, the first optical transmission component is located in the reflection light path of the first beam splitter; in the second swinging state, the switching mirror component is located in the reflection light path of the first beam splitter.

7. A switchable bidirectional beaconless laser communication device according to any one of claims 1 to 5, It is characterized in that The laser transceiver assembly includes a primary mirror and a secondary mirror, the reflective surface of the primary mirror is a concave surface, the secondary mirror is arranged at the focus of the reflective surface of the primary mirror, and the reflective surface of the secondary mirror faces the optical communication unit.

8. A switchable bidirectional beaconless laser communication method, the bidirectional beaconless laser communication method being based on the switchable beaconless laser communication device according to any one of claims 1 to 7, It is characterized in that The switchable bidirectional beacon-free laser communication method comprises the following steps: The laser is emitted to a laser transceiver assembly, and the laser is beam-contracted by the laser transceiver assembly to obtain a beam-contracted laser beam; Switching the switch mirror assembly to a first swinging state, emitting a laser beam to a first optical transmission assembly, and establishing a first optical receiving path of the first optical transmission assembly; Using the first optical transmission component to emit a first collimated light beam, and transmitting the first collimated light beam to the laser transceiver component through the first optical receiving path, and expanding and emitting the first collimated light beam through the laser transceiver component; Or, switching the switch mirror assembly to a second swinging state, emitting the laser beam to the second optical transmission assembly, and establishing a second optical receiving path of the second optical transmission assembly; The second collimated light beam is emitted by the second optical transmission component, and the second collimated light beam is transmitted to the laser transceiver component through the second optical receiving path, and the second collimated light beam is expanded and emitted through the laser transceiver component.

9. The switchable bidirectional beaconless laser communication method according to claim 8, It is characterized in that The step of switching the switch mirror assembly to a first swinging state, emitting a laser beam to a first optical transmission assembly, and establishing a first optical receiving path of the first optical transmission assembly comprises: Switching the switch mirror assembly to a first swinging state, reflecting the laser beam through the first fast reflection mirror into the second beam splitter, and the second beam splitter splits the laser beam into a first laser beam and a second laser beam; The first laser beam is transmitted through the second beam splitter and enters a first tracking camera, and a first tracking optical axis is established through the first tracking camera; The second laser beam is reflected by the second beam splitter, enters the first color splitter, is transmitted through the first color splitter and enters the first receiving lens, and the second laser beam is coupled to the first receiving detector through the first receiving lens to establish a first light receiving path.

10. The switchable bidirectional beaconless laser communication method according to claim 8, It is characterized in that The step of switching the switch mirror assembly to a second swinging state, emitting a laser beam to a second optical transmission assembly, and establishing a second optical receiving path of the second optical transmission assembly comprises: Switching the switching mirror assembly to a second swinging state, reflecting the laser beam through the switching mirror assembly and the second fast reflection mirror to the third beam splitter, wherein the third beam splitter splits the laser beam into a third laser beam and a fourth laser beam; The third laser beam is transmitted through the second dichroic mirror and enters the second tracking camera, and a second tracking optical axis is established through the second tracking camera; The fourth laser beam is reflected by the reflector, enters the second dichroic mirror, is transmitted through the second dichroic mirror and enters the second receiving lens. The fourth laser beam is coupled to the second receiving detector through the second receiving lens to establish a second light receiving path.

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