CN111130638A - Directional visible light communication system - Google Patents
Directional visible light communication system Download PDFInfo
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- CN111130638A CN111130638A CN201911313957.0A CN201911313957A CN111130638A CN 111130638 A CN111130638 A CN 111130638A CN 201911313957 A CN201911313957 A CN 201911313957A CN 111130638 A CN111130638 A CN 111130638A
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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
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
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Abstract
The invention mainly relates to the field of communication, and discloses a directional visible light communication system which comprises an illumination light source, a scanning mirror and a controller, wherein the scanning mirror comprises a reflecting surface, the illumination light source emits modulated illumination light to the reflecting surface of the scanning mirror, and the controller controls the scanning mirror to rotate according to the position of communication receiving equipment, so that the modulated illumination light reflected by the scanning mirror is irradiated to the position of the communication receiving equipment, and therefore, the tracking type directional visible light communication is realized by using a single set of illumination light source and one scanning mirror, and the system is simple, stable and reliable.
Description
Technical Field
The invention relates to visible light communication, in particular to a directional visible light communication system.
Background
Visible light communication is a wireless communication technology, and is a communication technology for achieving information transmission by utilizing bright and dark flashing signals emitted by an illumination light source, and the frequency of visible light is between 400 THz (wavelength 780 nm) and 800 THz (wavelength 375 nm); the LED lamp has high transmitting power, does not occupy radio frequency spectrum, does not have electromagnetic interference and electromagnetic radiation, and simultaneously realizes dual functions of illumination and communication. The visible light communication can be applied to the fields of illumination internet surfing, visible light spot television broadcasting service, novel visible light wireless broadcasting, visible light accurate positioning and the like. The current visible light communication is to illuminate a wide area and realize communication by using a plurality of illumination light sources, which complicates the entire system and increases the cost.
Disclosure of Invention
The present invention is directed to solving the above problems, and provides a directional visible light communication system which does not require a plurality of illumination light sources to illuminate and communicate a wide area during operation.
The purpose of the invention is mainly realized by the following technical scheme:
a directional visible light communication system comprises an illumination light source, a scanning mirror, a controller, a communication receiving device and an orientation tracking module, wherein the communication receiving device is provided with an orientation signal transmitting module,
the illumination light source emits modulated illumination light carrying communication information, the modulated illumination light irradiates on a reflecting surface of the scanning mirror, and the reflecting surface of the scanning mirror reflects the modulated illumination light to a free light space for illumination and communication;
the orientation signal transmitting module continuously transmits a positioning signal of the communication receiving equipment, the orientation tracking module continuously receives the positioning signal transmitted by the orientation signal transmitting module and transmits the positioning signal to the controller, and the controller controls the scanning mirror to track and rotate according to the received positioning signal so that the modulated illumination light reflected by the scanning mirror is irradiated to the position of the communication receiving equipment;
the communication receiving equipment comprises a light detector, and the light detector receives the modulated illumination light and converts the modulated illumination light into communication information for communication.
Further, the illumination light source is composed of an LED light source and a lens or a lens group, the lens or the lens group is a focusing lens or a focusing lens group, modulated illumination light emitted from the LED light source enters the lens or the lens group, the lens or the lens group focuses the modulated illumination light emitted from the LED light source onto a reflecting surface of the scanning mirror, and the modulated illumination light is reflected by the scanning mirror and then irradiates a photodetector on the communication receiving device as a light cone.
Furthermore, the illumination light source comprises a laser, a beam expanding lens and a focusing lens are sequentially arranged on a main optical axis of the laser, modulated illumination light emitted by the laser is expanded by the beam expanding lens, and the expanded modulated illumination light is focused on a reflecting surface of the scanning mirror and then reflected to a free light space by the focusing lens.
Further, the illumination light source comprises a plurality of lasers and a focusing lens, each laser emits collimated modulated illumination light, the plurality of lasers are arranged in parallel, the modulated illumination light emitted by each laser is parallel to each other, and a plurality of parallel modulated illumination lights pass through the focusing lens and then are focused on the reflecting surface of the scanning mirror to be reflected into a free light space.
Furthermore, a polarization sensitive grating layer is covered on the reflecting surface of the scanning mirror, the illumination light source simultaneously emits modulated illumination light containing two polarization states, the two polarization states are respectively a first polarization state and a second polarization state, the communication information carried by the modulated illumination light of the first polarization state and the modulated illumination light of the second polarization state are the same and synchronous, and the modulated illumination light of the two polarization states irradiates the reflecting surface of the scanning mirror; when the scanning mirror is fixed, the polarization sensitive grating layer is sensitive to a first polarization state and diffracts the modulated illumination light in the first polarization state into a first direction to be emitted, the polarization sensitive grating layer is insensitive to a second polarization state, the modulated illumination light in the second polarization state is reflected to a second direction on the reflecting surface of the scanning mirror after penetrating through the polarization sensitive grating layer, and the first direction and the second direction are different; when the scanning mirror tracks and rotates, the diffracted modulated illumination light in the first polarization state and the reflected modulated illumination light in the second polarization state track and rotate for illumination and communication in a free light space at a fixed included angle, wherein the fixed included angle is an included angle between the first direction and the second direction.
Further, the divergence angle of the modulated illumination light in the first polarization state and the divergence angle of the modulated illumination light in the second polarization state are both larger than zero, the diffracted modulated illumination light in the first polarization state forms a first light cone illumination area in the tracking rotation process of the scanning mirror, and the reflected modulated illumination light in the second polarization state forms a second light cone illumination area in the tracking rotation process of the scanning mirror.
Further, the first light cone irradiation area and the second light cone irradiation area are connected or partially overlapped.
Further, the scanning mirror employs a two-dimensional MEMS scanner.
By using the invention, the following beneficial effects can be produced: the device comprises an illumination light source, a scanning mirror and a controller, wherein the scanning mirror comprises a reflecting surface, the illumination light source emits modulated illumination light to the reflecting surface of the scanning mirror, and the controller controls the scanning mirror to rotate according to the position of communication receiving equipment to enable the modulated illumination light reflected by the scanning mirror to irradiate the position of the communication receiving equipment, so that tracking type directional visible light communication is realized by using a single set of illumination light source and one scanning mirror, and the system is simple, stable and reliable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the main structure of the system of the present invention;
FIG. 2 is a schematic view of a system of the present invention with the scan mirror at one angle;
FIG. 3 is a schematic view of a system of the present invention with the scan mirror at one angle;
FIG. 4 is a schematic view of a system of the present invention with the scan mirror at one angle;
FIG. 5 is a schematic view of the present invention with tracking light shining on the target surface;
FIG. 6 is a schematic view of an embodiment of the present invention in which an LED light source is used as the illumination light source;
FIG. 7 is a schematic view of an embodiment of the present invention in which a laser is used as the illumination light source;
FIG. 8 is a schematic view of an embodiment of the present invention in which multiple lasers are used as the illumination source;
FIG. 9 is a schematic diagram of an embodiment of the present invention in which a polarization sensitive grating layer is disposed on a scanning mirror;
FIG. 10 is a schematic diagram of an embodiment of the present invention in which a polarization sensitive grating layer is disposed on a scanning mirror and a divergence angle of tracking light is greater than zero;
FIG. 11 is a diagram of an embodiment of the present invention in which a polarization sensitive grating layer is disposed on a scanning mirror and the divergence angle of tracking light is greater than zero.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following examples and accompanying drawings, in which the cross-sectional sections are indicated by hatching, and the exemplary embodiments and descriptions thereof are merely illustrative and not restrictive.
In order to solve the problems of high power consumption and high cost of large-range visible light communication, the invention provides a tracking type directional visible light communication system capable of reducing the system cost.
Firstly, the system is mainly arranged as shown in fig. 1, and comprises an illumination light source 1, a scanning mirror 2, a controller 3, a communication receiving device 4 and an orientation tracking module 31, wherein the communication receiving device 4 is provided with an orientation signal transmitting module 41, a broken line in fig. 1 represents communication type connection, and wireless communication or wired communication can be adopted; the illumination light source 1 emits modulated illumination light carrying communication information, the wave band of the modulated illumination light is a visible light wave band, the scanning mirror 2 is a reflective optical device capable of rotating around a rotating shaft of the scanning mirror, the reflective optical device is mainly used in laser engraving and projection display, the illumination light source 1 is additionally provided with a communication information modulation system, namely, the illumination light source 1 is a light source in a substantially traditional visible light communication system, the modulated illumination light irradiates on a reflecting surface of the scanning mirror 2, and the reflecting surface of the scanning mirror 2 reflects the modulated illumination light to a free light space for illumination and communication;
the direction signal transmitting module 41 continuously transmits the positioning signal of the communication receiving device 4; the direction signal emitting module 41 may adopt a positioner that directly emits its own three-dimensional space coordinate signal (i.e., the positioning signal is a three-dimensional space coordinate signal), the direction signal emitting module 41 may also emit an infrared pulse signal in a large range (i.e., the positioning signal is an infrared pulse signal) so that the direction tracking module 31 continuously receives the infrared pulse signal, and the direction tracking module 31 or the controller positions the spatial position of the direction signal emitting module 41 according to the pulse flight time in the infrared pulse signal and the infrared signal receiving azimuth angle (i.e., the infrared tracking technology in the market);
the orientation tracking module 31 continuously receives the positioning signal transmitted by the orientation signal transmitting module 41 and transmits the positioning signal to the controller 3, and the controller 3 controls the scanning mirror 2 to rotate according to the received positioning signal, so that the modulated illumination light reflected by the scanning mirror 2 is irradiated to the position of the communication receiving device 4, thereby realizing communication.
According to the invention, a large number of lighting sources are not required to be arranged to achieve large-scale communication, only one lighting source is required to be arranged to carry out tracking type directional visible light communication, when the position of the communication receiving equipment is changed, the modulated illumination light can follow the communication receiving equipment through the cooperation of the direction signal emitting module and the direction tracking module, so that the communication is not interrupted, and the whole system has a simple structure and is low in cost.
Preferably, the scanning mirror 2 is a two-dimensional scanning mirror, so that the three-dimensional space can be conveniently illuminated and communicated; the illumination light source 1 can be a traditional visible light communication light source; the controller 3 can adopt a singlechip, a microprocessor and the like, and the controller 3 is used for giving a signal for rotating the scanning mirror 2, namely a common scanning mirror control method; fig. 2, 3 and 4 respectively show schematic diagrams of states of modulated illumination light propagating along three different main optical axis directions, namely states of the scanning mirror corresponding to three different deflection angles.
In an actual use scenario, when the communication receiving device moves, the following unexpected situations are present: if the position signal transmitting module transmits the positioning signal to delay, or the controller controls the scanning mirror to rotate according to the positioning signal, or the position represented by the positioning signal has an error with the position of the optical detector, the communication receiving device may lose the modulated illumination light reflected by the scanning mirror.
As shown in fig. 5, in the system for tracking illumination and communication by using the scanning mirror 2 of the present invention, the figure is a schematic diagram for explaining the principle, modulated illumination light emitted from the illumination light source 1 is reflected by the reflection surface and then irradiated in the free light space, the modulated illumination light irradiated in the free light space is named tracking light and marked as "7" in fig. 5, the tracking light 7 is irradiated on the target surface 6 of the photodetector 5 of the communication receiving device 4, and when the tracking light 7 is irradiated on the target surface 6, the photodetector 5 can receive the tracking light 7 carrying communication information; since the size of the target surface 6 of the optical detector 5 is generally small, when the above-mentioned accident occurs, the tracking light 7 may be separated from the target surface 6, so that the tracking light 7 cannot continuously irradiate on the target surface 6, and the target surface 6 is separated from the irradiation range of the tracking light 7, at this time, the communication signal may be lost by the communication receiving device 4.
For this purpose, the following four optimization schemes are proposed.
The first method comprises the following steps:
based on this, the present invention provides a preferred embodiment, which may be an example as shown in fig. 6, the illumination light source 1 is composed of an LED light source 101 and a lens or a lens group, the lens or the lens group is a focusing lens or a focusing lens group, modulated illumination light emitted from the LED light source 101 enters the lens or the lens group, the lens or the lens group focuses the modulated illumination light emitted from the LED light source onto the reflecting surface of the scanning mirror 2, and the preferred moving range of the reflecting point when the scanning mirror 2 rotates is within the focal depth of the lens or the lens group. The NA (numerical aperture) of the illumination light of the LED light source 101 itself is large, and after the illumination light is focused on the reflecting surface of the scanning mirror 2 through a lens or a lens group, the modulated illumination light focused on the reflecting surface is reflected and then irradiated to the free light space as a divergent light cone, so that the increase of the NA (i.e., the increase of the divergent angle) of the tracking light 7 is realized; the focusing of the modulated illumination onto the reflective surface by the lens or lens assembly also ensures that all of the modulated illumination emitted by the LED light source 101 is received and reflected by the scan mirror 2. Because the divergence angle of the tracking light 7 emitted to the free light space is large, the irradiation range of the tracking light is large, even if the above-mentioned unexpected situation occurs, the communication receiving device 4 can receive the tracking light 7 with the large divergence angle in the large range, so that even if the tracking light 7 does not timely track the position of the communication receiving device 4, the communication receiving device 4 can receive the tracking light 7 carrying the communication signal in a large area, and finally the possibility that the target surface 6 is out of the irradiation range of the tracking light 7 is effectively reduced.
And the second method comprises the following steps:
as shown in fig. 7, the illumination light source may also be a laser 8, a beam expanding lens 81 and a focusing lens 82 are sequentially arranged on a main optical axis of the laser 8, modulated illumination light emitted from the laser 8 enters the beam expanding lens 81, the beam expanding lens 81 increases a beam waist radius of the modulated illumination light, the modulated illumination light with the increased beam waist radius enters the focusing lens 82, the focusing lens 82 focuses the modulated illumination light with the increased beam waist radius on a reflection surface of the scanning mirror 2, preferably, a moving range of a reflection point when the scanning mirror 2 rotates is within a focal depth of the focusing lens 82, the modulated illumination light is reflected by the reflection surface of the scanning mirror 2 and then irradiates a free light space with a divergent light cone, and the laser 8 adopts a laser in a visible light waveband. Firstly, the modulation bandwidth potential of the system can be improved by adopting the laser as the illumination light source, because the modulation bandwidth of the laser is generally higher than that of the LED light source, and the anti-interference capability of the illumination light emitted by the laser is strong. What is more important, modulated illumination light emitted by the laser 8 is expanded and focused, so that the modulated illumination light is irradiated to a free light space by a divergent light cone, the irradiation range of the tracking light 7 is enlarged, the communication receiving device 4 can receive the tracking light 7 carrying communication signals in a larger area, and the possibility that the target surface 6 is separated from the irradiation range of the tracking light 7 is effectively reduced.
And the third is that:
in one embodiment, the illumination source may include a plurality of lasers 8, and further include a focusing lens 10, the plurality of lasers 8 being arranged in parallel and the modulated illumination emitted by each laser 8 being parallel to each other, in the present embodiment, the modulated illumination light emitted from each laser 8 is collimated light, and as shown in fig. 8, a plurality of modulated illumination lights emitted from a plurality of lasers 8 in parallel with each other enter a focusing lens 10, the focusing lens 10 focuses the plurality of modulated illumination lights on the reflecting surface of the scanning mirror 2, that is, the reflecting surface of the scanning mirror 2 is located at the focal plane of the focusing lens 10, preferably, when the scanning mirror 2 rotates, the moving range of the reflecting point is within the focal depth of the focusing lens 10, the communication information carried by the plurality of modulated illumination lights is the same at the same time, and the focused modulated illumination lights are scanned and reflected by the reflecting surface of the scanning mirror 2 and then irradiated into the free light space at a plurality of angles; in the embodiment, the illumination range at a certain moment is enlarged, when the target surface 6 has the accident, a plurality of tracking lights are irradiated in the free light space, so that the target surface 6 is not easy to be separated from the irradiation range of the tracking lights, and the possibility that the target surface 6 is separated from the irradiation range of the tracking lights is effectively reduced.
And fourthly:
as shown in fig. 9, in an embodiment, a polarization sensitive grating layer 11 is covered on a reflective surface of a scanning mirror 2, an illumination light source 1 simultaneously emits modulated illumination light including two polarization states, the two polarization states are a first polarization state and a second polarization state, respectively, communication information carried by the modulated illumination light of the first polarization state and the modulated illumination light of the second polarization state are the same and synchronous, and the modulated illumination light of the two polarization states is irradiated onto the reflective surface of the scanning mirror; when the scanning mirror 2 is fixed, the polarization sensitive grating layer 11 is sensitive to a first polarization state and reflectively diffracts the modulated illumination light of the first polarization state into tracking light of the first polarization state to be emitted in a first direction, the polarization sensitive grating layer 11 is insensitive to a second polarization state, the modulated illumination light of the second polarization state is reflected on a reflecting surface of the scanning mirror after penetrating through the polarization sensitive grating layer 11 to be emitted in a second direction, and the first direction is different from the second direction; when the scanning mirror 2 scans and rotates according to the azimuth signal, the diffracted modulated illumination light in the first polarization state (i.e., the tracking light in the first polarization state) and the diffracted modulated illumination light in the second polarization state (i.e., the tracking light in the second polarization state) track, illuminate and communicate in a free light space at a fixed included angle, where the fixed included angle is an included angle between the first direction and the second direction. When the polarization sensitive grating layer 11 is designed, the orientation of the first direction can be set by setting parameters such as grating constant, grating period and grating depth; it is preferable that the overlapping range of the irradiation region of the diffracted tracking light of the first polarization state in the first direction and the irradiation region of the reflected tracking light of the second polarization state in the second direction is as small as possible to increase the actual usable irradiation range, and the balance can be achieved by parameters such as the distance between the communication receiver 4 and the scanning mirror 2 and the NA of the modulated illumination light.
For example, when NA is equal to or close to zero, no lens or lens group may be used, that is, the illumination light source 1 emits collimated or substantially collimated modulated illumination light containing two polarization states to the scanning mirror, and as long as the first direction and the second direction are different, the diffracted tracking light of the first polarization state and the reflected tracking light of the second polarization state do not coincide; for another example, when NA is greater than zero, the polarization sensitive grating layer 11 may be designed such that the included angle between the first direction and the second direction is larger, so as to reduce the above-mentioned overlapping range.
Under the adoption of the preferred scheme, by utilizing the principle of polarization multiplexing and the light splitting principle of the polarization sensitive grating 11, two beams of tracking light can irradiate a free light space at one instant moment, so that the irradiation area of the tracking light at one instant moment is remarkably improved.
Preferably, NA of light emitted from the light source 1 is larger than zero (a light source with a larger NA may be selected), as shown in fig. 10, a lens or a lens group is required to focus the modulated illumination light on a reflecting surface of the scanning mirror, and the diffracted and reflected modulated illumination light is illuminated as a light cone, and since the first direction is different from the second direction, the tracking light in the first polarization state forms a first light cone illumination region (indicated by hatching in the present figure) and the tracking light in the second polarization state forms a second light cone illumination region (indicated by hatching in the present figure), and two scanning mirrors shown in the figure are intended to draw two positions of the scanning mirror 2 into the same figure, and in some cases, for example, when a divergence angle of the modulated illumination light is larger than an included angle between the first direction and the second direction, the two scanning illumination regions may partially overlap.
As shown in fig. 11, when the divergence angle of the modulated illumination light is greater than or equal to the included angle between the first direction and the second direction, the distance between the diffraction surface and the reflection surface caused by the thickness of the polarization-sensitive grating layer 11 is ignored (the thickness of the polarization-sensitive grating layer 11 is generally in the nanometer to micrometer range, and therefore is substantially negligible), the scanning angle of the scanning mirror 2 can be adjusted so that the first light cone illumination area (indicated by oblique hatching in this figure) and the second light cone illumination area (indicated by square hatching in this figure) meet or partially coincide, and the two scanning mirrors shown in the figure mean that two positions of the scanning mirror 2 are drawn in the same figure, and then the illumination area at a certain time of the scanning mirror 2 is the total illumination area of the first light cone illumination area and the second light cone illumination area, thereby increasing the instantaneous illumination area and reducing the possibility that the tracking light leaves the target surface 6. When the polarization sensitive grating layer 11 and polarization multiplexing are not adopted, only the second light cone irradiation area exists, the actual irradiation area is smaller, and when some accidents occur, the tracking light cannot be tracked in time, the target surface 6 is easy to be separated from the irradiation area of the tracking light.
In some embodiments, the illumination light source 1 may include two single-polarization light sources, and the two single-polarization light sources emit the modulated illumination light in the first polarization state and the modulated illumination light in the second polarization state respectively and then combine into a modulated illumination light including the first polarization state and the second polarization state through polarization combining, which is a common technology in the industry.
In any of the above embodiments, the scanning mirror is preferably a two-dimensional MEMS scanner.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A directional visible light communication system, characterized by: comprises an illumination light source, a scanning mirror, a controller, a communication receiving device and an orientation tracking module, wherein the communication receiving device is provided with an orientation signal transmitting module,
the illumination light source emits modulated illumination light carrying communication information, the modulated illumination light irradiates on a reflecting surface of the scanning mirror, and the reflecting surface of the scanning mirror reflects the modulated illumination light to a free light space for illumination and communication;
the orientation signal transmitting module continuously transmits a positioning signal of the communication receiving equipment, the orientation tracking module continuously receives the positioning signal transmitted by the orientation signal transmitting module and transmits the positioning signal to the controller, and the controller controls the scanning mirror to track and rotate according to the received positioning signal so that the modulated illumination light reflected by the scanning mirror is irradiated to the position of the communication receiving equipment;
the communication receiving equipment comprises a light detector, and the light detector receives the modulated illumination light and converts the modulated illumination light into communication information for communication.
2. A directional visible light communication system according to claim 1, wherein: the illumination light source is composed of an LED light source and a lens or a lens group, the lens or the lens group is a focusing lens or a focusing lens group, modulated illumination light emitted by the LED light source enters the lens or the lens group, the lens or the lens group focuses the modulated illumination light emitted by the LED light source on a reflecting surface of the scanning mirror, and the modulated illumination light is reflected by the scanning mirror and then irradiates a light detector on the communication receiving equipment in a light cone shape.
3. A directional visible light communication system according to claim 1, wherein: the illumination light source comprises a laser, a beam expanding lens and a focusing lens are sequentially arranged on a main optical axis of the laser, modulated illumination light emitted by the laser is expanded by the beam expanding lens, and the focusing lens focuses the expanded modulated illumination light on a reflecting surface of the scanning mirror and then reflects the modulated illumination light to a free light space.
4. A directional visible light communication system according to claim 1, wherein: the illumination light source comprises a plurality of lasers and a focusing lens, each laser emits collimated modulated illumination light, the lasers are arranged in parallel, the modulated illumination light emitted by each laser is parallel to each other, and a plurality of parallel modulated illumination lights pass through the focusing lens and then are focused on a reflecting surface of the scanning mirror to be reflected into a free light space.
5. A directional visible light communication system according to any one of claims 1 to 4, wherein: the illumination light source emits modulated illumination light containing two polarization states at the same time, the two polarization states are respectively a first polarization state and a second polarization state, the communication information carried by the modulated illumination light in the first polarization state and the communication information carried by the modulated illumination light in the second polarization state are the same and synchronous, and the modulated illumination light in the two polarization states irradiates the reflecting surface of the scanning mirror; when the scanning mirror is fixed, the polarization sensitive grating layer is sensitive to a first polarization state and diffracts the modulated illumination light in the first polarization state into a first direction to be emitted, the polarization sensitive grating layer is insensitive to a second polarization state, the modulated illumination light in the second polarization state is reflected to a second direction on the reflecting surface of the scanning mirror after penetrating through the polarization sensitive grating layer, and the first direction and the second direction are different; when the scanning mirror tracks and rotates, the diffracted modulated illumination light in the first polarization state and the reflected modulated illumination light in the second polarization state track and rotate for illumination and communication in a free light space at a fixed included angle, wherein the fixed included angle is an included angle between the first direction and the second direction.
6. A directional visible light communication system according to claim 5, wherein: the divergence angle of the modulated illumination light in the first polarization state and the divergence angle of the modulated illumination light in the second polarization state are both larger than zero, the diffracted modulated illumination light in the first polarization state forms a first light cone irradiation area in the tracking rotation process of the scanning mirror, and the reflected modulated illumination light in the second polarization state forms a second light cone irradiation area in the tracking rotation process of the scanning mirror.
7. A directional visible light communication system according to claim 6, wherein: the first light cone irradiation area and the second light cone irradiation area are connected or partially overlapped.
8. A directional visible light communication system according to claim 6, wherein: the scanning mirror adopts a two-dimensional MEMS scanner.
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