CN111092655B - High-speed modulation visible light communication system - Google Patents
High-speed modulation visible light communication system Download PDFInfo
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- CN111092655B CN111092655B CN201911314121.2A CN201911314121A CN111092655B CN 111092655 B CN111092655 B CN 111092655B CN 201911314121 A CN201911314121 A CN 201911314121A CN 111092655 B CN111092655 B CN 111092655B
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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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- 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
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- H04B10/516—Details of coding or modulation
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Abstract
The invention mainly relates to the field of communication, and discloses a high-speed modulation visible light communication system which mainly 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 to scan and reflect the illumination light to a free light space for illumination and communication, so that large-range illumination and communication can be 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 high-speed modulation 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 high-speed modulated visible light communication system that 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 high-speed modulation visible light communication system comprises an illumination light source, a scanning mirror and a communication receiving device, wherein the scanning mirror comprises a reflecting surface, the illumination light source emits modulated illumination light carrying communication information, the modulated illumination light is irradiated on the reflecting surface of the scanning mirror, the scanning mirror rotates and scans along a rotating shaft of the scanning mirror, the modulated illumination light is scanned and reflected to a free light space to form scanned illumination light for illumination and communication, the communication receiving device comprises a light detector, and the light detector converts the modulated illumination light into the communication information for communication when receiving the modulated illumination light.
Further, the divergence angle of the scanning illumination light is greater than zero, and the divergence angle of the scanning illumination light is greater than or equal to the scanning angle of the scanning mirror.
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 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 free light space with a light cone.
Further, the illumination light source comprises at least one laser, and modulated illumination light emitted by the laser irradiates on the reflecting surface of the scanning mirror and is then scanned and reflected to the free light space.
Furthermore, the illumination light source comprises a plurality of lasers and a beam combination module, modulated illumination light emitted by the plurality of lasers is combined into a beam of modulated illumination light through the beam combination module, and then the modulated illumination light is irradiated on the reflecting surface of the scanning mirror and is scanned and reflected to the free light space.
Furthermore, 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 are focused on the reflecting surface of the scanning mirror to be reflected into the 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 in the first polarization state and the modulated illumination light in the second polarization state is 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 scans and rotates, the diffracted modulated illumination light in the first polarization state and the reflected modulated illumination light in the second polarization state scan, illuminate and communicate in a free light space at a fixed included angle, and 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 scanning illumination area during scanning of the scanning mirror, and the reflected modulated illumination light in the second polarization state forms a second light cone scanning illumination area during scanning of the scanning mirror.
Further, the first light cone scanning irradiation area and the second light cone scanning irradiation area are connected or partially overlapped.
By using the invention, the following beneficial effects can be produced: including illumination source, scanning mirror, controller, including the plane of reflection on the scanning mirror, illumination source outgoing modulation illumination light to the plane of reflection of scanning mirror on, when controller control scanning mirror rotates with this illumination light scanning reflection to free light space in throw light on and communicate to the realization utilizes single set of illumination source and a scanning mirror alright shine and communicate on a large scale, and the system is simple reliable and stable.
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 a system according to the present invention with the scan mirror at one angle;
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 the present invention when the size of the illumination surface of the scanning illumination light on the target surface is smaller than the size of the target surface;
FIG. 5 is a schematic view of the present invention when the size of the illumination surface of the scanning illumination light on the target surface is larger than the size of the target surface;
FIG. 6 is a schematic diagram of an embodiment of the present invention in which the divergence angle of the scanning illumination light is greater than zero;
FIG. 7 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. 8 is a schematic view of an embodiment of the present invention in which a laser is used as the illumination light source;
FIG. 9 is a schematic diagram of an embodiment of the present invention in which multiple lasers are used as the illumination source;
FIG. 10 is a schematic view of an embodiment of the present invention in which multiple lasers are used as the illumination source;
FIG. 11 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. 12 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 the divergence angle of the scanning illumination light is greater than zero;
FIG. 13 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 the scanning illumination 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.
A high-speed modulation visible light communication system is disclosed, as shown in fig. 1-3, and comprises an illumination light source 1, a scanning mirror 2, a controller 3 and a communication receiving device 4, wherein the controller 3 is connected with a broken line of the scanning mirror 2 to represent communication connection, the scanning mirror 2 comprises a reflecting surface, the illumination light source 1 is attached with a communication information modulation system, the illumination light source 1 emits modulation illumination light to the reflecting surface of the scanning mirror 2, the controller 3 sends an instruction to the scanning mirror 2 to enable the scanning mirror 2 to rotate along a rotating shaft thereof, the illumination light is scanned and reflected to a free light space to form scanning illumination light for illumination and communication, the communication receiving device 4 comprises a light detector 5, and the light detector 5 converts the modulation illumination light into communication information for communication when receiving the modulation illumination light; the scanning mode can adopt a grid mode or a Lissajous mode and the like for scanning. Fig. 1, 2, and 3 respectively show schematic diagrams of states of modulated illumination light propagating along three different main optical axis directions, that is, states of the scanning mirror corresponding to three different deflection angles. 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.
The controller 3 controls the scanning mirror 2 to rotate at a high frequency, so that the illumination light can be reflected to different directions, illumination and communication in different directions are realized, and illumination and communication in a range which can be scanned by the scanning mirror 2 are realized within a certain integration time. In the using process of the invention, the large-scale illumination and communication can be realized only by a single set of illumination light source 1 and one scanning mirror 2, and the large-scale illumination and communication can be realized without arranging traditional visible light modulation systems at a plurality of places, thereby greatly reducing the system cost and simplifying the system structure.
As shown in fig. 4, in the system for scanning illumination and communication by using the scanning mirror 2 of the present invention, fig. 4 is a schematic diagram, when the scanning illumination light 7 is irradiated onto the target surface 6 of the optical detector 5 of the communication receiving device 4, and the irradiated surface is smaller than the size of the target surface 6 of the optical detector 5, the optical detector 5 can receive the scanning illumination light 7 carrying communication information in the whole time period when the scanning illumination light 7 scans the target surface 6, and the size of the target surface 6, the size of the irradiated surface and the scanning speed of the scanning mirror 2 (the scanning speed is determined by the scanning frequency) determine the time period for the target surface 6 to receive the illumination light, and the communication information can be continuously received in the time period range; when the scanning illumination light is scanned away from the target surface 6, the scanning speed of the scanning mirror 2 determines the interval duration of the scanning illumination light 7 from retracing to the target surface 6 next time, and the light detector 5 restarts receiving communication information after retracing to the target surface 6;
from the above discussion, it can be seen that when the scanning illumination light 7 is within the acceptance range of the target surface 6, the communication bandwidth of the present invention is determined by the modulation bandwidth of the illumination light source 1; when the scanning illumination light 7 leaves the receiving range of the target surface 6, the communication bandwidth of the invention is determined by the scanning frequency of the scanning mirror 2, and the higher the scanning frequency of the scanning mirror 2 is, the shorter the interval duration in the range of retracing to the target surface 6 is;
when the illumination surface of the scanning illumination light 7 illuminated to the optical detector 5 of the communication receiving device 4 is larger than the target surface 6 of the optical detector 5 of the communication receiving device 4, as shown in fig. 5, in the process that the scanning illumination light 7 scans the target surface 6, the target surface 6 can receive the scanning illumination light 7 and the communication information carried by the scanning illumination light 7 in the whole course, and the size of the target surface 6, the size of the illumination surface, and the scanning speed of the scanning mirror 2 (the scanning speed is determined by the scanning frequency) determine the time length for the target surface 6 to receive the scanning illumination light 7, and the communication information can be continuously received in the time length; similarly, after the scanning illumination light 7 is scanned away from the target surface 6, the scanning speed of the scanning mirror 2 determines the interval duration of the scanning illumination light 7 retracing to the target surface 6 next time, and the light detector 5 restarts receiving communication information after retracing to the target surface 6;
from the above discussion, it can be seen that when the scanning illumination light covers the range of acceptance of the target surface 6, the communication bandwidth of the present invention is determined by the modulation bandwidth of the illumination light source 1; when the scanning illumination light 7 leaves the receiving range of the target surface 6, the communication bandwidth of the invention is determined by the scanning frequency of the scanning mirror 2, and the higher the scanning frequency of the scanning mirror 2 is, the shorter the interval duration in the range of retracing to the target surface 6 is; meanwhile, obviously, the larger the irradiation surface of the scanning illumination light 7 is (i.e. the larger the irradiation range of the scanning illumination light 7 is), the shorter the interval duration of the retrace to the target surface 6 is, and the equivalent time duration of the target surface 6 receiving the scanning illumination light 7 is increased;
preferably, as shown in fig. 6, when the divergence angle of the scanning illumination light 7 is greater than zero (i.e. the numerical aperture of the scanning illumination light 7 is greater than zero), and the divergence angle of the scanning illumination light 7 is greater than or equal to the scanning angle of the scanning mirror 2, in a single scanning stroke of the scanning mirror 2, the right edge of the scanning illumination light 7 (indicated by hatching in the figure) reflected by the initial angular position is necessarily within the irradiation range of the scanning illumination light 7 (indicated by hatching in the figure) reflected by the end angular position, or coincides with the left edge of the scanning illumination light 7 (indicated by hatching in the figure) reflected by the end angular position, so that the irradiation ranges of the scanning illumination light 7 reflected by the initial angular position and the end angular position can be completely connected in front and back, then the target surface 6 of the photodetector 5 of the communication receiving device 4 located in the scanning range can receive the scanning illumination light 7 all the way, so that the communication is uninterrupted.
To equivalently increase the period of time that the target surface 6 receives the scanning illumination light 7, first, the divergence angle of the scanning illumination light 7 (i.e., the numerical aperture thereof) may be increased, that is, the divergence angle of the scanning illumination light 7 is increased, to increase the irradiation range of the scanning illumination light 7, so that the interval of time during which the scanning illumination light 7 is swept back into the target surface 6 is shorter; based on this, the present invention proposes a preferred embodiment, which may be an example as shown in fig. 7, 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, the modulated illumination light emitted from the LED light source 101 enters the lens or the lens group, and the lens or the lens group focuses the modulated illumination light emitted from the LED light source onto the reflection surface of the scanning mirror 2. The NA of the LED light source 101 is large, and after the LED light source is focused on the reflecting surface of the scanning mirror 2 through the lens or the lens group, modulated illumination light focused on the reflecting surface is reflected and then irradiates to a free light space through a divergent light cone, so that all modulated illumination light emitted by the LED light source 101 is ensured to be received and reflected and scanned by the scanning mirror 2 on the premise of increasing the NA and increasing the illumination range at a certain moment; within a single scanning period, more modulated illumination light is shone on the target surface 6 of the light detector 5 of the communication reception device 4;
as shown in fig. 8, the illumination light source may also include at least one laser 8, modulated illumination light emitted from the laser 8 is irradiated onto the reflective surface of the scanning mirror 2, the modulated illumination light is reflected by the reflective surface of the scanning mirror 2 and then is scanned and reflected to the free light space, the laser 8 adopts a laser in the visible light band, and the adoption of the laser as the illumination light source can improve the modulation bandwidth potential of the system, because the modulation bandwidth of the laser is generally higher than that of an LED light source, and the interference rejection capability of the illumination light emitted from the laser is strong.
As shown in fig. 9, the illumination light source includes a plurality of lasers 8 and a beam combining module 9, modulated illumination light emitted from the plurality of lasers 8 is combined into one modulated illumination light by the beam combining module 9 and then irradiated on the reflection surface of the scanning mirror, and the combined modulated illumination light is scanned and reflected into the free light space. The beam combining module 9 can adopt various beam combiners such as a wavelength beam combiner, a polarization beam combiner, a prism beam combiner and the like, and can improve the illumination brightness and the signal-to-noise ratio of communication by adopting a plurality of lasers.
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. 10, 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, the moving range of the reflecting point when the scanning mirror 2 rotates in a scanning manner 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 irradiated into the free light space at a plurality of angles after being scanned and reflected by the reflecting surface of the scanning mirror 2; the present embodiment not only increases the illumination range at a certain moment, but also enables more scanning illumination light to be irradiated on the target surface 6 of the photodetector 5 of the communication receiving device 4 in a single scanning period of the scanning mirror 2, i.e., increases the time period for which the target surface 6 receives the scanning illumination light 7. More scanning illumination light is shone on the target surface 6 of the light detector 5 of the communication reception device 4 in a single scanning cycle, which can reduce the frequency requirements on the scanning mirror 2.
As shown in fig. 11, in order to further improve the duration of the modulated illumination light in a single period of the scanning mirror 2 irradiating on the target surface 6 of the photodetector 5, preferably, in an embodiment, the reflective surface of the scanning mirror 2 is covered with a polarization sensitive grating layer 11, the illumination light source 1 simultaneously emits modulated illumination light containing two polarization states, the two polarization states are a first polarization state and a second polarization state, respectively, the communication information carried by the modulated illumination light in the first polarization state and the modulated illumination light in the second polarization state is the same and synchronous, and the modulated illumination light in the two polarization states irradiates on 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 diffracts the modulated illumination light of the first polarization state into a first direction in a reflection mode for emergence, the polarization sensitive grating layer 11 is insensitive to a second polarization state, the modulated illumination light of the second polarization state is reflected to a second direction on a reflecting surface of the scanning mirror after penetrating through the polarization sensitive grating layer 11, and the first direction and the second direction are different; when the scanning mirror 2 scans and rotates, the diffracted modulated illumination light in the first polarization state and the reflected modulated illumination light in the second polarization state scan, illuminate and communicate with each other 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. 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 illumination region of the diffracted modulated illumination light of the first polarization state in the first direction and the illumination region of the reflected modulated illumination light of the second polarization state in the second direction is as small as possible, and the balance can be comprehensively balanced 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 modulated illumination light of the first polarization state and the reflected modulated illumination 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 modulated illumination light can sweep the target surface 6 of the optical detector 5 of the communication receiving equipment 4 in one scanning period, so that the time length of the illumination light irradiating on the target surface 6 is remarkably prolonged.
Furthermore, when NA of light emitted from the light source 1 is greater than zero, as shown in fig. 12, it is necessary to focus modulated illumination light on the reflecting surface of the scanning mirror by using a lens or a lens group, and the diffracted and reflected modulated illumination light is scanned in a cone of light, and since the first direction is different from the second direction, the modulated illumination light in the first polarization state forms a first cone of light scanning irradiation region (indicated by hatching in the present figure) and the modulated illumination light in the second polarization state forms a second cone of light scanning irradiation region (indicated by hatching in the present figure), the 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 the divergence angle of the modulated illumination light is greater than the angle between the first direction and the second direction, the two scanning irradiation regions may partially overlap.
As shown in fig. 13, when the divergence angle of the modulated illumination light is greater than or equal to the angle between the first direction and the second direction, ignoring the thickness of the polarization-sensitive grating layer 11 here leads to a distance between the diffraction and reflection surfaces (the thickness of the polarization-sensitive grating layer 11 is typically in the nanometer to micrometer range and is therefore essentially negligible), the scanning angle of the scanning mirror 2 can be adjusted to make the first light cone scanning irradiation area (indicated by oblique line shading in the figure) and the second light cone scanning irradiation area (indicated by square shading in the figure) meet or partially coincide, the two scanning mirrors shown in the figures are meant to show the two positions of the scanning mirror 2 in the same figure, so that after one scanning stroke of the scanning mirror 2 (meaning a single pass scan of the scanning mirror 2, without retrace), the actual illumination area of the whole system is the first cone scan illumination area plus the second cone scan illumination area. When the polarization sensitive grating layer 11 and polarization multiplexing are not adopted, only the second light cone scanning irradiation area exists, if the actual irradiation area with the same size is to be realized, the scanning angle of the scanning mirror 2 needs to be increased by two times, the flyback time of the scanning mirror 2 under the same specification can be increased, and the resistance power and the power consumption are increased. The advantages of this embodiment are: the scanning travel of the scanning mirror 2 can be reduced by the scanning mirror 2 with the same specification, a larger scanning range can be achieved in a smaller scanning angle, and the retrace time of the scanning mirror 2 is shortened, so that modulated illumination light can be retraced onto the target surface 6 of the optical detector 5 more quickly to start communication; the embodiment also reduces the performance requirement on the scanning mirror 2, and can use the scanning mirror 2 with a smaller scanning angle range to realize a larger actual scanning angle; if the scanning mirror 2 with the high frequency specification is adopted, the energy loss in a single scanning period is reduced after the scanning stroke of the scanning mirror 2 is reduced by adopting the scheme of the embodiment, and the flyback time is shortened, so that the power consumption of the scanning mirror 2 is reduced, and the reduction of the flyback time is actually equivalent to the improvement of the frequency of the scanning mirror 2.
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 high speed modulated visible light communication system, characterized by: the scanning mirror comprises an illumination light source, a scanning mirror and a communication receiving device, wherein the scanning mirror comprises a reflecting surface, the illumination light source emits modulated illumination light carrying communication information, the modulated illumination light is irradiated on the reflecting surface of the scanning mirror, the scanning mirror rotates along a rotating shaft of the scanning mirror to scan and reflect the modulated illumination light to a free light space to form the scanned illumination light for illumination and communication, the communication receiving device comprises a light detector, and the light detector receives the modulated illumination light and converts the modulated illumination light into the communication information for communication;
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 scans and rotates, the modulated illumination light in the first polarization state and the modulated illumination light in the second polarization state scan, illuminate and communicate in a free light space at a fixed included angle, and the fixed included angle is the included angle between the first direction and the second direction.
2. A high speed modulated visible light communication system as claimed in claim 1, wherein: the divergence angle of the scanning illumination light is greater than zero, and the divergence angle of the scanning illumination light is greater than or equal to the scanning angle of the scanning mirror.
3. A high speed modulated visible light communication system according to claim 1 or 2, 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 free light space with a light cone.
4. A high speed modulated visible light communication system as claimed in claim 1, wherein: the illumination light source comprises at least one laser, and modulated illumination light emitted by the laser irradiates on a reflecting surface of the scanning mirror and is then scanned and reflected to a free light space.
5. A high speed modulated visible light communication system as claimed in claim 4, wherein: the illumination light source comprises a plurality of lasers and a beam combination module, modulated illumination light emitted by the lasers is combined into a beam of modulated illumination light through the beam combination module, and then the modulated illumination light irradiates the reflecting surface of the scanning mirror and is scanned and reflected to a free light space.
6. A high speed modulated visible light communication system as claimed in claim 4, 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.
7. A high speed modulated visible light communication system as claimed in claim 6, 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 scanning irradiation area in the scanning process of the scanning mirror, and the reflected modulated illumination light in the second polarization state forms a second light cone scanning irradiation area in the scanning process of the scanning mirror.
8. A high speed modulated visible light communication system as claimed in claim 7, wherein: the first light cone scanning irradiation area and the second light cone scanning irradiation area are connected or partially overlapped.
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