CN114696901B - Beam alignment method and related equipment - Google Patents
Beam alignment method and related equipment Download PDFInfo
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- CN114696901B CN114696901B CN202011643473.5A CN202011643473A CN114696901B CN 114696901 B CN114696901 B CN 114696901B CN 202011643473 A CN202011643473 A CN 202011643473A CN 114696901 B CN114696901 B CN 114696901B
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- 230000003287 optical effect Effects 0.000 claims abstract description 202
- 238000004891 communication Methods 0.000 claims abstract description 186
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 178
- 238000003384 imaging method Methods 0.000 claims abstract description 68
- 239000013307 optical fiber Substances 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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Abstract
The embodiment of the application discloses a beam alignment method and related equipment. The method of the embodiment of the application comprises the following steps: the first optical communication device transmits a first light beam to the second optical communication device and receives a second light beam transmitted by the second optical communication device. Wherein the second optical communication device comprises a first liquid crystal beam deflection means on which an initial spot of the second light beam and a target spot of the first light beam are formed. The first optical communication device acquires first imaging information corresponding to the first liquid crystal beam deflection device, and determines first position offset information between a target light spot of the first light beam and an initial light spot of the second light beam according to the first imaging information, wherein the position and the size of the initial light spot of the second light beam are fixed. The first optical communication apparatus adjusts a deflection direction of the first light beam according to the first positional deviation information such that a distance between a center of a target spot of the first light beam and a center of an initial spot of the second light beam is less than or equal to a preset distance.
Description
Technical Field
The present application relates to the field of spatial optical communications, and in particular, to a beam alignment method and related apparatus.
Background
The space laser communication system refers to an optical communication system using laser light waves as carrier waves and the atmosphere as a transmission medium. Among them, how to achieve the acquisition, tracking and alignment of the light beam (ATP, actigit, tracking and pointing) is a core problem of free-space optical communication. For example, a Station (STA) is deflected by an angle θ relative to an Access Point (AP), and it is necessary for the STA to know the deflection angle θ and perform angle correction.
One current approach is to configure the transceiver, processor and antenna for wireless communication at the AP and STA, respectively. The STA may obtain angle information required to deflect a beam emitted by itself from the AP through a wireless communication link, thereby implementing ATP. However, this approach requires additional configuration of the wireless communication system, increasing system cost. And, the communication delay introduced by the wireless communication system also causes a larger delay for realizing beam alignment.
Disclosure of Invention
The application provides a beam alignment method and related equipment, wherein the local equipment does not need to additionally configure a wireless communication system to acquire deflection information of a beam from the opposite equipment, thereby reducing the system cost and reducing the time delay for realizing beam alignment.
In a first aspect, the present application provides a beam alignment method comprising the steps of. First, the first optical communication apparatus transmits a first light beam to the second optical communication apparatus, and receives a second light beam transmitted by the second optical communication apparatus. The second optical communication device comprises a first liquid crystal beam deflection device, wherein a light spot formed by a second light beam on the first liquid crystal beam deflection device is an initial light spot of the second light beam, and a light spot formed by the first light beam on the first liquid crystal beam deflection device is a target light spot of the first light beam. Then, the first optical communication device acquires first imaging information corresponding to the first liquid crystal beam deflection device, and determines first position offset information between a target spot of the first light beam and an initial spot of the second light beam according to the first imaging information. Wherein the position and size of the initial spot of the second beam is fixed. Further, the first optical communication apparatus adjusts the deflection direction of the first light beam according to the first positional deviation information such that a distance between a center of the target spot of the first light beam and a center of the initial spot of the second light beam is less than or equal to a preset distance.
In this embodiment, the beam emitted by the opposite device forms a spot of light with a position and size that is invariant on the opposite device, the local device scales with the spot, and beam alignment is achieved by adjusting the deflection direction of the emitted beam. Similarly, the light spot formed on the local device by the light beam emitted by the local device also has invariance of position and size, the opposite device scales with the light spot, and the light beam alignment is realized by adjusting the deflection direction of the emitted light beam. By the method, the local terminal equipment does not need to additionally configure a wireless communication system to acquire the deflection information of the light beam from the opposite terminal equipment, so that the system cost is reduced, and the time delay for realizing the light beam alignment is reduced.
In some possible embodiments, the first optical communication device includes a second liquid crystal beam deflection device, the first beam forming a spot on the second liquid crystal beam deflection device that is an initial spot of the first beam, and the second beam forming a spot on the second liquid crystal beam deflection device that is a target spot of the second beam. On the basis of the above-described completion of beam alignment by the first optical communication apparatus, the second optical communication apparatus will also take similar operations to complete beam alignment. Specifically, the second optical communication device acquires second imaging information corresponding to the second liquid crystal beam deflection device, and determines second position offset information between the target spot of the second light beam and the initial spot of the first light beam according to the second imaging information. Wherein the position and size of the initial spot of the first beam is fixed. Further, the second optical communication apparatus adjusts the deflection direction of the second light beam according to the second position offset information such that a distance between a center of the target spot of the second light beam and a center of the initial spot of the first light beam is less than or equal to a preset distance. By the mode, the optical communication equipment at the two ends can realize beam alignment, so that the optical communication equipment at the two ends can normally communicate.
In some possible embodiments, the first light beam is directed to the first liquid crystal beam deflection device after passing through the second liquid crystal beam deflection device. The second light beam passes through the first liquid crystal light beam deflection device and then is guided to the second liquid crystal light beam deflection device. In this embodiment, the optical communication devices at both ends adjust the deflection direction of the light beam emitted by the optical communication devices through the liquid crystal beam deflection device, so that the initial spot position of the light beam emitted by the optical communication devices is unchanged, and the target spot position of the light beam emitted by the optical communication devices can be adjusted, thereby facilitating the optical communication devices at both ends to complete the beam alignment.
In some possible embodiments, the first and second liquid crystal beam deflection devices include, but are not limited to, liquid crystal on silicon (Liquid Crystal On Silicon, lcos), liquid crystal polarization gratings (Liquid Crystal Polarization Grating, LCPG), liquid crystal wedges, and liquid crystal phased arrays. The application provides various specific implementations of the liquid crystal beam deflection device, and improves the expansibility of the scheme.
In some possible embodiments, the first optical communication device adjusting the deflection direction of the first light beam according to the first positional offset information comprises: the first optical communication device adjusts the grating loaded on the second liquid crystal beam deflection device according to the first position deviation information so as to adjust the refraction direction of the first light beam after passing through the second liquid crystal beam deflection device. Or the first optical communication device adjusts the grating loaded on the second liquid crystal beam deflection device according to the first position deviation information so as to adjust the reflection direction of the first light beam after passing through the second liquid crystal beam deflection device. In this embodiment, either a refractive liquid crystal beam deflector or a reflective liquid crystal beam deflector may be used, which improves the flexibility of the present solution.
In some possible embodiments, the center of the target spot of the first beam coincides with the center of the initial spot of the second beam, resulting in a higher accuracy of beam alignment.
In some possible implementations, the first optical communication device transmitting the first light beam to the second optical communication device includes: the first optical communication device beam collimates the first light beam. Further, the first optical communication device emits the first light beam after the light beam collimation to the second optical communication device. The emitted light is the light beam after the collimation of the light beam, so that the accuracy of the light beam transmission direction is improved, and the light beam alignment is more convenient to realize.
In some possible embodiments, the first light beam and the second light beam are beacon light. Alternatively, the first light beam and the second light beam are communication light. It should be understood that the beacon light and the communication light are lights of different frequency bands. The beacon light and the communication light can be emitted by the same light source or emitted by different light sources, so that the flexibility of the scheme is improved.
In some possible embodiments, the types of the first optical communication device and the second optical communication device include, but are not limited to, AP and STA, improving the realisation of the present solution.
In a second aspect, the present application provides an optical communication apparatus. The optical communication device includes: an optical transceiver, an imaging device and a first liquid crystal beam deflection device. The optical transceiver is used for: the first light beam is transmitted to the second optical communication device and the second light beam transmitted by the second optical communication device is received. The second optical communication device comprises a second liquid crystal beam deflection device, wherein a light spot formed by the second light beam on the second liquid crystal beam deflection device is an initial light spot of the second light beam, and a light spot formed by the first light beam on the second liquid crystal beam deflection device is a target light spot of the first light beam. The imaging device is used for: and acquiring first imaging information corresponding to the second liquid crystal beam deflection device, determining first position offset information between a target light spot of the first light beam and an initial light spot of the second light beam according to the first imaging information, and sending the first position offset information to the first liquid crystal beam deflection device. Wherein the position and size of the initial spot of the second beam is fixed. The first liquid crystal beam deflection device is used for: and adjusting the deflection direction of the first light beam according to the first position offset information so that the distance between the center of the target light spot of the first light beam and the center of the initial light spot of the second light beam is smaller than or equal to a preset distance.
In some possible embodiments, the spot of the first beam formed on the first liquid crystal beam deflection device is an initial spot of the first beam, and the spot of the second beam formed on the first liquid crystal beam deflection device is a target spot of the second beam. The second optical communication device acquires second imaging information corresponding to the second liquid crystal beam deflection device, and determines second position offset information between a target light spot of the second light beam and an initial light spot of the first light beam according to the second imaging information. Wherein the position and size of the initial spot of the first beam is fixed. Further, the second optical communication apparatus adjusts the deflection direction of the second light beam according to the second position offset information such that a distance between a center of the target spot of the second light beam and a center of the initial spot of the first light beam is less than or equal to a preset distance.
In some possible embodiments, the first light beam passes through the first liquid crystal beam deflector and is directed to the second liquid crystal beam deflector. The second light beam passes through the second liquid crystal light beam deflection device and then is guided to the first liquid crystal light beam deflection device.
In some possible embodiments, the first and second liquid crystal beam deflection devices include, but are not limited to Lcos, LCPG, liquid crystal wedges, or liquid crystal phased arrays.
In some possible embodiments, the first liquid crystal beam deflection device is specifically configured to: and adjusting the grating loaded on the first liquid crystal beam deflection device according to the first position deviation information so as to adjust the refraction direction of the first light beam after passing through the first liquid crystal beam deflection device. Or adjusting the grating loaded on the first liquid crystal beam deflection device according to the first position deviation information so as to adjust the reflection direction of the first light beam after passing through the first liquid crystal beam deflection device.
In some possible embodiments, the center of the target spot of the first beam coincides with the center of the initial spot of the second beam.
In some possible embodiments, the optical communication device further comprises a fiber collimator. The optical fiber collimator is used for carrying out beam collimation on the first light beam and emitting the first light beam after beam collimation to the second optical communication equipment.
In some possible embodiments, the first light beam and the second light beam are beacon light, or the first light beam and the second light beam are communication light.
In some possible implementations, the types of first and second optical communication devices include, but are not limited to, APs and STAs.
In a third aspect, the present application provides an optical communication apparatus. The optical communication device includes a processor, a memory, and an optical transceiver. Wherein the processor, the memory and the optical transceiver are interconnected by wires, the processor invoking program code in the memory for performing the beam alignment method as described in any of the embodiments of the first aspect above.
In a fourth aspect, the present application provides an optical communication system comprising: a first optical communication device and a second optical communication device. The first optical communication apparatus includes a first optical transceiver, a first imaging device, and a first liquid crystal beam deflection device. The second optical communication apparatus includes a second optical transceiver, a second imaging device, and a second liquid crystal beam deflection device.
The first optical transceiver is configured to emit a first light beam. The light spot formed by the first light beam on the first liquid crystal light beam deflection device is an initial light spot of the first light beam, and the light spot formed by the second light beam on the first liquid crystal light beam deflection device is a target light spot of the second light beam. The first imaging device is used for: and acquiring first imaging information corresponding to the second liquid crystal beam deflection device, determining first position offset information between a target light spot of the first light beam and an initial light spot of the second light beam according to the first imaging information, and sending the first position offset information to the first liquid crystal beam deflection device. Wherein the position and size of the initial spot of the second beam is fixed. The first liquid crystal beam deflection device is used for: and adjusting the deflection direction of the first light beam according to the first position offset information so that the distance between the center of the target light spot of the first light beam and the center of the initial light spot of the second light beam is smaller than or equal to a preset distance.
The second optical transceiver is configured to emit a second light beam. The light spot formed by the second light beam on the second liquid crystal light beam deflection device is an initial light spot of the second light beam, and the light spot formed by the first light beam on the second liquid crystal light beam deflection device is a target light spot of the first light beam. The second imaging device is used for: and acquiring second imaging information corresponding to the first liquid crystal beam deflection device, determining second position offset information between a target light spot of the second light beam and an initial light spot of the first light beam according to the second imaging information, and sending the second position offset information to the second liquid crystal beam deflection device. Wherein the position and size of the initial spot of the first beam is fixed. The second liquid crystal beam deflection device is used for: and adjusting the deflection direction of the second light beam according to the second position offset information so that the distance between the center of the target light spot of the second light beam and the center of the initial light spot of the first light beam is smaller than or equal to a preset distance.
In a fifth aspect, the present application provides a computer readable storage medium storing a computer program, wherein the computer program is capable of implementing part or all of the steps of any one of the methods of the first aspect described above when executed by hardware.
In the embodiment of the application, the light spot formed on the opposite end equipment by the light beam emitted by the opposite end equipment has invariance of position and size, the local end equipment scales by the light spot, and the light beam alignment is realized by adjusting the deflection direction of the emitted light beam. Similarly, the light spot formed on the local device by the light beam emitted by the local device also has invariance of position and size, the opposite device scales with the light spot, and the light beam alignment is realized by adjusting the deflection direction of the emitted light beam. By the method, the local terminal equipment does not need to additionally configure a wireless communication system to acquire the deflection information of the light beam from the opposite terminal equipment, so that the system cost is reduced, and the time delay for realizing the light beam alignment is reduced.
Drawings
FIG. 1 is a schematic diagram of a spatial optical communication system architecture;
FIG. 2 is a schematic diagram of an embodiment of a beam alignment method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical communication system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another optical communication system according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an optical communication system implementing beam alignment in an embodiment of the present application;
FIG. 6 is a schematic diagram of one possible optical communication device;
Fig. 7 is a schematic diagram of another possible optical communication device;
fig. 8 is a schematic structural diagram of an optical communication system according to an embodiment of the present application.
Detailed Description
The application provides a beam alignment method and related equipment, wherein the local equipment does not need to additionally configure a wireless communication system to acquire deflection information of a beam from the opposite equipment, thereby reducing the system cost and reducing the time delay for realizing beam alignment. It should be noted that the terms "first" and "second" and the like in the description and the claims of the present application and the above drawings are used for distinguishing between similar objects and not for limiting a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than described of illustrated herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of a spatial optical communication system architecture. As shown in fig. 1, the free optical communication system includes an AP and an STA. In the case where the light beams emitted by both the AP and the STA are aligned, the AP and the STA can normally perform spatial optical communication. If the STA is deflected by an angle θ with respect to the AP, the STA is required to acquire the deflected angle θ to complete the angle correction. However, the STA cannot detect the deflection angle θ by itself, and only the AP can detect the deflection angle θ. Then, in order for the STA to acquire the deflection angle θ from the AP, it is necessary to configure one set of wireless communication devices for each of the AP and the STA. The wireless communication device may include a transceiver, a processor, an antenna, and the like. The STA may obtain the deflection angle θ from the AP via the wireless communication link and complete the angle correction. However, this approach requires additional configuration of the wireless communication system, increasing system costs. And, the communication delay introduced by the wireless communication system also causes a larger delay for realizing beam alignment.
Therefore, the application provides a beam alignment method, the local equipment does not need to acquire the deflection information of the beam from the opposite equipment through an additional configuration wireless communication system, the system cost is reduced, and the time delay for realizing beam alignment is reduced.
Fig. 2 is a schematic diagram of an embodiment of a beam alignment method according to an embodiment of the present application. In an example, the beam alignment method includes the following steps. Note that the present application is not limited to the specific types of the first optical communication device and the second optical communication device in the following embodiments, for example, the types of the first optical communication device and the second optical communication device include, but are not limited to, AP and STA.
201. The first optical communication device transmits a first light beam to the second optical communication device.
Fig. 3 is a schematic structural diagram of an optical communication system according to an embodiment of the present application. As shown in fig. 3, the first optical communication device 30 emits a first optical beam through a local optical transceiver 301. First, the first light beam is projected to the liquid crystal beam deflection device 302 of the first optical communication device 30, and then, the first light beam passes through the liquid crystal beam deflection device 302 and is projected to the liquid crystal beam deflection device 402 of the second optical communication device 40. Wherein the first light beam forms an initial spot of the first light beam on the liquid crystal beam deflection device 302. The first light beam forms a target spot of the first light beam on the liquid crystal beam deflection device 402.
It should be noted that, the position of the initial spot of the first light beam on the liquid crystal beam deflection device 302 is fixed, and the size and phase of the initial spot of the first light beam are also fixed. The liquid crystal beam deflection device 302 also has the ability to vary the beam deflection, and therefore the position of the target spot of the first beam on the liquid crystal beam deflection device 402 is variable. That is, the optical path of the first light beam between the optical transceiver 301 and the liquid crystal beam deflecting device 302 is fixed, and the optical path of the first light beam between the liquid crystal beam deflecting device 302 and the liquid crystal beam deflecting device 402 is adjustable.
202. The second optical communication device transmits a second light beam to the first optical communication device.
As shown in fig. 3, the second optical communication device 40 emits a second optical beam through a local optical transceiver 401. First, the second light beam is projected to the liquid crystal beam deflection device 402 of the second optical communication apparatus 40, and then the second light beam passes through the liquid crystal beam deflection device 402 and is projected to the liquid crystal beam deflection device 302 of the first optical communication apparatus 30. Wherein the second beam forms an initial spot of the second beam on the liquid crystal beam deflection device 402. The second light beam forms a target spot of the second light beam on the liquid crystal beam deflection device 302.
It should be noted that, the position of the initial spot of the second light beam on the liquid crystal beam deflection device 402 is fixed, and the size and phase of the initial spot of the second light beam are also fixed. The liquid crystal beam deflection device 402 also has the ability to vary the beam deflection, and therefore the position of the target spot of the second beam on the liquid crystal beam deflection device 302 is variable. That is, the optical path of the second light beam between the optical transceiver 401 and the liquid crystal beam deflecting device 402 is fixed, and the optical path of the second light beam between the liquid crystal beam deflecting device 402 and the liquid crystal beam deflecting device 302 is adjustable.
In some possible embodiments, the first optical communication device 30 will also perform beam collimation on the first light beam, and the first light beam after beam collimation passes through the liquid crystal beam deflection device 302 and is transmitted to the liquid crystal beam deflection device 402. Similarly, the second optical communication device 40 will also perform beam collimation on the second light beam, and the second light beam after beam collimation passes through the liquid crystal beam deflection device 402 and is transmitted to the liquid crystal beam deflection device 302. Alternatively, the optical transceiver 301 and the optical transceiver 401 may be separately packaged spatial optical transceiver devices, i.e. the first light beam emitted by the optical transceiver 301 and the second light beam emitted by the optical transceiver 401 are already light beams collimated by the light beams. Alternatively, the optical transceivers 301 and 401 may be optical modules, where the optical modules may be connected to the optical fiber collimator by optical fibers, that is, the first light beam emitted by the optical transceiver 301 and the second light beam emitted by the optical transceiver 401 are collimated by the optical fiber collimator.
It should be understood that the present application is not limited to the specific types of liquid crystal beam deflection device 302 and liquid crystal beam deflection device 402 described above. For example, types of liquid crystal beam deflection device 302 and liquid crystal beam deflection device 402 include, but are not limited to, liquid crystal on silicon (Liquid Crystal On Silicon, lcos), liquid crystal polarization gratings (Liquid Crystal Polarization Grating, LCPG), liquid crystal wedges, and liquid crystal phased arrays.
Alternatively, the first light beam and the second light beam may be beacon light dedicated to beam alignment or communication light for normal communication. It should be understood that the beacon light and the communication light are lights of different frequency bands. The beacon light and the communication light may be emitted by the same light source or by different light sources.
203. The first optical communication device acquires first imaging information.
As shown in fig. 3, the first optical communication apparatus 30 further includes an imaging device 303. The imaging device 303 is used to acquire first imaging information on the liquid crystal beam deflection device 402. That is, the imaging device 303 obtains the first imaging information of the target spot of the first light beam and the initial spot of the second light beam by geometrical optical imaging with the target spot of the first light beam and the initial spot of the second light beam on the liquid crystal beam deflection device 402 as the photographed object. It should be understood that the present application is not limited to a particular type of imaging device 303, for example, the imaging device 303 may be a charge coupled device (Charge Coupled Device, CCD) camera or the like.
204. The first optical communication apparatus determines first positional shift information from the first imaging information.
After the imaging device 303 acquires the first imaging information, the first position offset information between the target spot of the first light beam and the initial spot of the second light beam is further determined according to the first imaging information. Specifically, the imaging device 303 may determine the center of the target spot of the first light beam and the center of the initial spot of the second light beam first, and further calculate the first positional offset information of the center of the target spot of the first light beam with respect to the center of the initial spot of the second light beam. The first position offset information may include a distance between centers of the two light spots and an angle offset. It should be understood that the imaging device 303 may acquire the center of the light spot in a variety of ways, and is not limited in this specific manner. For example, the imaging device 303 may determine the position where the light intensity of the light spot is highest as the light spot center by means of light spot fitting.
205. The first optical communication apparatus adjusts a deflection direction of the first light beam according to the first positional deviation information.
In this embodiment, the imaging device 303 sends the first positional deviation information to the liquid crystal beam deflection device 302. The deflection direction of the first light beam is adjusted by the liquid crystal beam deflection device 302 according to the first positional deviation information such that a distance between a center of a target spot of the first light beam and a center of an initial spot of the second light beam is less than or equal to a preset distance on the liquid crystal beam deflection device 402. That is, since the initial spot position and size of the second beam are fixed, the initial spot of the second beam is scaled, and the target spot of the first beam is aligned with the initial spot of the second beam, so that the first beam can be transmitted to the optical transceiver 401 after passing through the liquid crystal beam deflector 402. In a preferred implementation, the target spot of the first beam and the initial spot of the second beam should at least partially overlap, or the center of the target spot of the first beam and the center of the initial spot of the second beam completely coincide, to achieve a more desirable beam alignment effect.
In one possible implementation, the liquid crystal beam deflection device 302 may adjust the deflection direction of the first beam by adjusting the grating loaded by itself. Specifically, as shown in fig. 3, the liquid crystal beam deflection device 302 transmits the first light beam, that is, adjusts the refractive direction of the first light beam after passing through the liquid crystal beam deflection device 302. Alternatively, as shown in fig. 4, the liquid crystal beam deflection device 302 reflects the first light beam, that is, adjusts the reflection direction of the first light beam after passing through the liquid crystal beam deflection device 302.
206. The second optical communication apparatus acquires second imaging information.
As shown in fig. 3, the second optical communication apparatus 40 further includes an imaging device 403. The imaging device 403 is used to acquire second imaging information on the liquid crystal beam deflecting device 302. That is, the imaging device 403 obtains the second imaging information of the target spot of the second light beam and the initial spot of the first light beam by geometrical optical imaging with the target spot of the second light beam and the initial spot of the first light beam on the liquid crystal beam deflection device 302 as the photographed object.
207. The second optical communication device determines second positional offset information from the second imaging information.
After the imaging device 403 acquires the second imaging information, the second position offset information between the target spot of the second light beam and the initial spot of the first light beam is also determined according to the second imaging information. Specifically, the imaging device 403 may determine the center of the target spot of the second light beam and the center of the initial spot of the first light beam, and further calculate the second positional offset information of the center of the target spot of the second light beam with respect to the center of the initial spot of the first light beam. The second position offset information may include a distance between centers of the two light spots and an angle offset.
208. The second optical communication apparatus adjusts a deflection direction of the second light beam according to the second position offset information.
In this embodiment, imaging device 403 sends the second position offset information to liquid crystal beam deflection device 402. The deflection direction of the second light beam is adjusted by the liquid crystal beam deflection device 402 according to the second position offset information such that the distance between the center of the target spot of the second light beam and the center of the initial spot of the first light beam is less than or equal to a preset distance on the liquid crystal beam deflection device 302. That is, since the initial spot position and size of the first beam are fixed, the initial spot of the first beam is scaled, and the target spot of the second beam is aligned with the initial spot of the first beam, so that the second beam can be transmitted to the optical transceiver 301 after passing through the liquid crystal beam deflector 302. In a preferred implementation, the target spot of the second beam and the initial spot of the first beam should at least partially overlap, or the center of the target spot of the second beam and the center of the initial spot of the first beam completely coincide, to achieve a more desirable beam alignment effect. It should be understood that the liquid crystal beam deflection device 402 may be either a transmissive liquid crystal beam deflection device as shown in fig. 3 or a reflective liquid crystal beam deflection device as shown in fig. 4.
Fig. 5 is a schematic diagram of an optical communication system for implementing beam alignment according to an embodiment of the present application. As shown in fig. 5, in order for the first optical communication device 30 and the second optical communication device 40 to be able to communicate normally, both the first optical communication device 30 and the second optical communication device 40 have to perform beam alignment operation. I.e. the first optical communication device 30 completes the beam alignment by performing the above-mentioned steps 203-205. The second optical communication device 40 performs beam alignment by performing steps 206-208 described above. In a preferred implementation, steps 203-205 and steps 206-208 are performed simultaneously so that the two ends can complete beam alignment as soon as possible. In another possible implementation manner, steps 203 to 205 may be performed first and then steps 206 to 208 may be performed, or steps 206 to 208 may be performed first and then steps 203 to 205 may be performed, which is not limited herein.
In the embodiment of the application, the light spot formed on the opposite end equipment by the light beam emitted by the opposite end equipment has invariance of position and size, the local end equipment scales by the light spot, and the light beam alignment is realized by adjusting the deflection direction of the emitted light beam. Similarly, the light spot formed on the local device by the light beam emitted by the local device also has invariance of position and size, the opposite device scales with the light spot, and the light beam alignment is realized by adjusting the deflection direction of the emitted light beam. By the method, the local terminal equipment does not need to additionally configure a wireless communication system to acquire the deflection information of the light beam from the opposite terminal equipment, so that the system cost is reduced, and the time delay for realizing the light beam alignment is reduced.
The beam alignment method in the embodiment of the present application is described above, and the optical communication device in the embodiment of the present application is described below. It should be appreciated that the optical communication device may be either the first optical communication device in the embodiment shown in fig. 2 described above or the second optical communication device in the embodiment shown in fig. 2 described above.
Fig. 6 is a schematic structural diagram of one possible optical communication device. The optical communication apparatus includes an optical transceiver 601, an imaging device 602, and a liquid crystal beam deflecting device 603. Specifically, the optical transceiver 601 is used to perform the operations of beam transceiving in the embodiment shown in fig. 2 described above. The imaging device 602 is configured to perform steps 203-204 or steps 206-207 in the embodiment shown in fig. 2 described above. The liquid crystal beam deflection means 603 is used to perform step 205 or step 208 in the embodiment shown in fig. 2 described above.
Fig. 7 is a schematic structural diagram of another possible optical communication device. The optical communication device comprises a processor 701, a memory 702 and an optical transceiver 703. The processor 701, the memory 702 and the optical transceiver 703 are interconnected by wires, wherein the memory 702 is adapted to store program instructions and data. The optical transceiver 703 includes a transmitter and a receiver. In one possible implementation, the memory 702 stores program instructions and data that support the steps of the embodiment shown in fig. 2, and the processor 701 and the optical transceiver 703 are used to perform the method steps of the embodiment shown in fig. 2. Specifically, the optical transceiver 601 is configured to perform an operation of light beam transmission and reception, and the processor 701 is configured to perform an operation other than light beam transmission and reception.
It should be noted that the processor shown in fig. 7 may be a general-purpose central processing unit (Central Processing Unit, CPU), a microprocessor, an application-specific integrated circuit ASIC, or at least one integrated circuit for executing a related program, so as to implement the technical solution provided by the embodiments of the present application. The memory shown in FIG. 7 described above may store an operating system and other application programs. When the technical scheme provided by the embodiment of the application is implemented by software or firmware, program codes for implementing the technical scheme provided by the embodiment of the application are stored in a memory and executed by a processor. In one embodiment, the processor may include memory within. In another embodiment, the processor and the memory are two separate structures.
Fig. 8 is a schematic structural diagram of an optical communication system according to an embodiment of the present application. The optical communication system includes a first optical communication device 801 and a second optical communication device 802. The first optical communication device 801 is configured to perform some or all of the steps of any of the methods performed by the first optical communication device in the embodiment illustrated in fig. 2 described above. The second optical communication device 802 is configured to perform some or all of the steps of any of the methods performed by the second optical communication device in the embodiment illustrated in fig. 2 described above.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
Those of ordinary skill in the art will appreciate that all or a portion of the steps implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing the relevant hardware, where the program may be stored in a computer readable storage medium, where the storage medium may be a read-only memory, a random access memory, etc. Specifically, for example: the processing unit or processor may be a central processing unit, a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
When implemented in software, the method steps described in the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.
Claims (20)
1. A method of beam alignment comprising:
the first optical communication device transmits a first light beam to a second optical communication device and receives a second light beam transmitted by the second optical communication device, wherein the second optical communication device comprises a first liquid crystal light beam deflection device, a light spot formed by the second light beam on the first liquid crystal light beam deflection device is an initial light spot of the second light beam, and a light spot formed by the first light beam on the first liquid crystal light beam deflection device is a target light spot of the first light beam;
the first optical communication device acquires first imaging information corresponding to the first liquid crystal beam deflection device;
the first optical communication device determines first position offset information between a target light spot of the first light beam and an initial light spot of the second light beam according to the first imaging information, wherein the position and the size of the initial light spot of the second light beam are fixed;
the first optical communication device adjusts the deflection direction of the first light beam according to the first position offset information so that the distance between the center of the target light spot of the first light beam and the center of the initial light spot of the second light beam is smaller than or equal to a preset distance.
2. The method of claim 1, wherein the first optical communication device comprises a second liquid crystal beam deflection device, wherein the spot of the first beam formed on the second liquid crystal beam deflection device is an initial spot of the first beam, and wherein the spot of the second beam formed on the second liquid crystal beam deflection device is a target spot of the second beam;
the second imaging information corresponding to the second liquid crystal beam deflection device is acquired by the second optical communication device, second position offset information between a target light spot of the second light beam and an initial light spot of the first light beam is determined by the second optical communication device according to the second imaging information, the position and the size of the initial light spot of the first light beam are fixed, and the deflection direction of the second light beam is adjusted by the second optical communication device according to the second position offset information, so that the distance between the center of the target light spot of the second light beam and the center of the initial light spot of the first light beam is smaller than or equal to the preset distance.
3. The method of claim 2, wherein the first beam is directed to the first liquid crystal beam deflector after passing through the second liquid crystal beam deflector, and the second beam is directed to the second liquid crystal beam deflector after passing through the first liquid crystal beam deflector.
4. A method according to claim 2 or 3, wherein the first and second liquid crystal beam deflection devices are liquid crystal on silicon Lcos, liquid crystal polarization grating LCPG, liquid crystal wedges or liquid crystal phased arrays.
5. A method according to claim 2 or 3, wherein the first optical communication device adjusting the deflection direction of the first light beam according to the first positional offset information comprises:
the first optical communication device adjusts the grating loaded on the second liquid crystal beam deflection device according to the first position deviation information so as to adjust the refraction direction of the first light beam after passing through the second liquid crystal beam deflection device;
or,
and the first optical communication equipment adjusts the grating loaded on the second liquid crystal light beam deflection device according to the first position deviation information so as to adjust the reflection direction of the first light beam after passing through the second liquid crystal light beam deflection device.
6. A method according to any one of claims 1 to 3, wherein the centre of the target spot of the first beam coincides with the centre of the initial spot of the second beam.
7. A method according to any one of claims 1 to 3, wherein the first optical communication device transmitting a first light beam to the second optical communication device comprises:
The first optical communication device performs beam collimation on the first light beam;
the first optical communication device transmits the first light beam after the collimation of the light beam to the second optical communication device.
8. A method according to any one of claims 1 to 3, wherein the first and second light beams are beacon light or the first and second light beams are communication light.
9. A method according to any of claims 1 to 3, wherein the first optical communication device is an access point AP, the second optical communication device is a station STA, or the first optical communication device is a STA and the second optical communication device is an AP.
10. An optical communication device, comprising: an optical transceiver, an imaging device and a first liquid crystal beam deflection device;
the optical transceiver is used for: transmitting a first light beam to a second optical communication device and receiving a second light beam transmitted by the second optical communication device, wherein the second optical communication device comprises a second liquid crystal light beam deflection device, a light spot formed by the second light beam on the second liquid crystal light beam deflection device is an initial light spot of the second light beam, and a light spot formed by the first light beam on the second liquid crystal light beam deflection device is a target light spot of the first light beam;
The imaging device is used for: acquiring first imaging information corresponding to the second liquid crystal beam deflection device, determining first position offset information between a target light spot of the first light beam and an initial light spot of the second light beam according to the first imaging information, and sending the first position offset information to the first liquid crystal beam deflection device, wherein the position and the size of the initial light spot of the second light beam are fixed;
the first liquid crystal beam deflection device is used for: and adjusting the deflection direction of the first light beam according to the first position offset information so that the distance between the center of the target light spot of the first light beam and the center of the initial light spot of the second light beam is smaller than or equal to a preset distance.
11. The optical communication apparatus according to claim 10, wherein a spot of the first light beam formed on the first liquid crystal beam deflection device is an initial spot of the first light beam, and a spot of the second light beam formed on the first liquid crystal beam deflection device is a target spot of the second light beam;
the second imaging information corresponding to the first liquid crystal light beam deflection device is acquired by the second optical communication device, second position offset information between a target light spot of the second light beam and an initial light spot of the first light beam is determined by the second optical communication device according to the second imaging information, the position and the size of the initial light spot of the first light beam are fixed, and the deflection direction of the second light beam is adjusted by the second optical communication device according to the second position offset information, so that the distance between the center of the target light spot of the second light beam and the center of the initial light spot of the first light beam is smaller than or equal to the preset distance.
12. The optical communication device of claim 11, wherein the first light beam passes through the first liquid crystal beam deflector and is directed to the second liquid crystal beam deflector, and wherein the second light beam passes through the second liquid crystal beam deflector and is directed to the first liquid crystal beam deflector.
13. The optical communication device according to claim 11 or 12, wherein the first and second liquid crystal beam deflection means are liquid crystal on silicon Lcos, liquid crystal polarization grating LCPG, liquid crystal wedge or liquid crystal phased array.
14. The optical communication device according to any one of claims 10 to 12, wherein the first liquid crystal beam deflection means is specifically configured to:
adjusting a grating loaded on the first liquid crystal beam deflection device according to the first position deviation information so as to adjust the refraction direction of the first light beam passing through the first liquid crystal beam deflection device;
or,
and adjusting the grating loaded on the first liquid crystal light beam deflection device according to the first position deviation information so as to adjust the reflection direction of the first light beam after passing through the first liquid crystal light beam deflection device.
15. The optical communication device according to any one of claims 10 to 12, wherein the center of the target spot of the first beam coincides with the center of the initial spot of the second beam.
16. The optical communication device according to any one of claims 10 to 12, further comprising an optical fiber collimator;
the optical fiber collimator is used for carrying out beam collimation on the first light beam and transmitting the first light beam after beam collimation to the second optical communication equipment.
17. The optical communication device according to any one of claims 10 to 12, wherein the first and second light beams are beacon light or the first and second light beams are communication light.
18. The optical communication device according to any one of claims 10 to 12, the optical communication device being an access point, AP, the second optical communication device being a station, STA, or the optical communication device being a STA, the second optical communication device being an AP.
19. An optical communication system, comprising: a first optical communication device including a first optical transceiver, a first imaging means, and a first liquid crystal beam deflection means, and a second optical communication device including a second optical transceiver, a second imaging means, and a second liquid crystal beam deflection means;
The first optical transceiver is used for emitting a first light beam;
the second optical transceiver is configured to emit a second light beam, where a light spot formed by the first light beam on the first liquid crystal light beam deflection device is an initial light spot of the first light beam, a light spot formed by the second light beam on the first liquid crystal light beam deflection device is a target light spot of the second light beam, a light spot formed by the second light beam on the second liquid crystal light beam deflection device is an initial light spot of the second light beam, and a light spot formed by the first light beam on the second liquid crystal light beam deflection device is a target light spot of the first light beam;
the first imaging device is used for: acquiring first imaging information corresponding to the second liquid crystal beam deflection device, determining first position offset information between a target light spot of the first light beam and an initial light spot of the second light beam according to the first imaging information, and sending the first position offset information to the first liquid crystal beam deflection device, wherein the position and the size of the initial light spot of the second light beam are fixed;
the second imaging device is used for: acquiring second imaging information corresponding to the first liquid crystal beam deflection device, determining second position offset information between a target light spot of the second light beam and an initial light spot of the first light beam according to the second imaging information, and sending the second position offset information to the second liquid crystal beam deflection device, wherein the position and the size of the initial light spot of the first light beam are fixed;
The first liquid crystal beam deflection device is used for: adjusting the deflection direction of the first light beam according to the first position offset information so that the distance between the center of the target light spot of the first light beam and the center of the initial light spot of the second light beam is smaller than or equal to a preset distance;
the second liquid crystal beam deflection device is used for: and adjusting the deflection direction of the second light beam according to the second position offset information so that the distance between the center of the target light spot of the second light beam and the center of the initial light spot of the first light beam is smaller than or equal to the preset distance.
20. A computer readable storage medium comprising computer instructions which, when run on a computer device, cause the computer device to perform the method of any of claims 1 to 9.
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| US20030090818A1 (en) * | 2001-11-02 | 2003-05-15 | Wittenberger John Carl | Co-aligned receiver and transmitter for wireless link |
| US20050031350A1 (en) * | 2003-08-05 | 2005-02-10 | Ilan Haber | Miniature optical free space transceivers |
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| CN107852260A (en) * | 2015-08-07 | 2018-03-27 | 华为技术有限公司 | The apparatus and method of optic communication |
| CN108631865A (en) * | 2018-03-14 | 2018-10-09 | 北京盛安同力科技开发有限公司 | A kind of laser space communication terminal |
| CN110246115A (en) * | 2019-04-23 | 2019-09-17 | 西安理工大学 | A kind of detection method of far-field laser light spot image |
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