CN110299944B - LED visible light communication system - Google Patents
LED visible light communication system Download PDFInfo
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- CN110299944B CN110299944B CN201910582640.0A CN201910582640A CN110299944B CN 110299944 B CN110299944 B CN 110299944B CN 201910582640 A CN201910582640 A CN 201910582640A CN 110299944 B CN110299944 B CN 110299944B
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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Abstract
In the using process, continuous light emitted by an LED lamp bead of LED illumination equipment is coupled into an optical fiber, the optical fiber guides the continuous light into a light modulator for signal modulation, the light modulator loads a modulation coding signal on the continuous light, then the light modulator emits modulated light to the optical fiber, and the optical fiber emits the modulated light into a free light space for communication; the LED lamp bead is not required to be subjected to signal modulation, an external modulation mode is adopted, high-speed modulation is realized without the limitation of LED modulation bandwidth in the using process, and when the optical modulator adopts an electro-optical modulator, the modulation bandwidth can reach dozens of hundreds of GHz; in addition, the stable light guide performance of the optical fiber enables the modulation signal to realize high-performance-to-noise-ratio transmission.
Description
Technical Field
The invention relates to visible light communication, in particular to an LED visible light communication system.
Background
Indoor visible light communication is a wireless communication technology developed along with an LED lighting technology in recent years, and LEDs have the advantages of energy conservation, long service life, high reliability and the like, can be used for visible light communication while being used as lighting tools. In the visible light communication, a communication coding signal is loaded on an LED driving circuit by adopting modulation modes such as amplitude modulation, orthogonal frequency division multiplexing modulation, pulse width modulation and quadrature phase shift keying modulation, so that an LED outputs illumination light carrying a modulation signal for communication in the illumination process, and therefore the modulation bandwidth of the LED determines the communication bandwidth. Further, the modulation bandwidth of the LED is limited by the response rate, which in turn is limited by the minority carrier lifetime τ in the semiconductorcGenerally, the theoretical modulation bandwidth of the LED is below 2GHz, and in actual engineering use, the modulation bandwidth of the LED is difficult to reach above GHz level, and the low modulation bandwidth makes it difficult for the LED to perform high-speed communication.
Disclosure of Invention
The invention aims to solve the problems and provides an LED visible light communication system, which does not need to modulate signals of an LED lamp bead in an LED lighting device in the working process, does not have requirements on the performance of the LED lamp bead, guides continuous light emitted by the LED lamp bead into a light modulator through an optical fiber, modulates the signals of the continuous light passing through the light modulator, and then guides the modulated light out to a free light space through the optical fiber.
The purpose of the invention is mainly realized by the following technical scheme:
an LED visible light communication system comprises LED illumination equipment, N coupling devices, N optical fiber coupling devices, N first optical fibers, a second optical fiber, an optical modulator, a third optical fiber, an optical fiber beam splitter, M fourth optical fibers and M optical fiber coupling-out devices;
the LED lighting equipment comprises one or more LED lamp beads, continuous light is emitted from the one or more LED lamp beads, the continuous light enters the N optical fiber coupling devices through the N coupling devices, each optical fiber coupling device is connected with a first optical fiber, and the continuous light enters the N first optical fibers;
the N first optical fibers are coupled with the second optical fiber, and continuous light enters the second optical fiber after passing through the N first optical fibers;
the second optical fiber is connected to the optical modulator, continuous light enters the optical modulator, the optical modulator performs signal modulation on the continuous light, and the continuous light is modulated into modulated light;
the optical modulator is also connected with a third optical fiber, and the optical modulator outputs modulated light to enter the third optical fiber;
the third optical fiber is accessed to an incident port of the optical fiber beam splitter, the optical fiber beam splitter comprises M emergent ports, each emergent port is connected with a fourth optical fiber, and the modulated light is divided into M parts with the same energy through the optical fiber beam splitter and enters the M fourth optical fibers in a one-to-one correspondence manner;
each fourth optical fiber is connected with an optical fiber coupling-out device, and M optical fiber coupling-out devices emit modulated light.
Furthermore, the coupling device adopts a micro lens, and the N coupling devices form a micro lens array.
Further, M of said fourth optical fibers are equal in length to each other.
Further, the optical fiber coupling-out device is composed of an optical fiber collimator and a lens.
Further, the optical fiber coupling-out device is an optical fiber collimator.
An LED visible light communication system comprises LED illumination equipment, a coupling device, an optical fiber coupling device, a first optical fiber, a second optical fiber, an optical modulator, a third optical fiber, an optical fiber beam splitter, M fourth optical fibers and M optical fiber coupling-out devices;
the LED lighting equipment comprises one or more LED lamp beads, continuous light is emitted from one or more LED lamp beads, the continuous light enters one optical fiber coupling device through one coupling device, the optical fiber coupling device is connected with a first optical fiber, and the continuous light enters the first optical fiber;
the first optical fiber is coupled with the second optical fiber, and continuous light enters the second optical fiber after passing through the first optical fiber;
the second optical fiber is connected to the optical modulator, continuous light enters the optical modulator, the optical modulator performs signal modulation on the continuous light, and the continuous light is modulated into modulated light;
the optical modulator is also connected with a third optical fiber, and the optical modulator outputs modulated light to enter the third optical fiber;
the third optical fiber is accessed to an incident port of the optical fiber beam splitter, the optical fiber beam splitter comprises M emergent ports, each emergent port is connected with a fourth optical fiber, and the modulated light is divided into M parts with the same energy through the optical fiber beam splitter and enters the M fourth optical fibers in a one-to-one correspondence manner;
each fourth optical fiber is connected with an optical fiber coupling-out device, and M optical fiber coupling-out devices emit modulated light.
Further, M of said fourth optical fibers are equal in length to each other.
Further, the optical fiber coupling-out device is composed of an optical fiber collimator and a lens.
Further, the optical fiber coupling-out device is an optical fiber collimator.
Furthermore, the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are all multimode optical fibers.
By using the invention, the following beneficial effects can be produced: in the using process of the LED illumination device, continuous light emitted by an LED lamp bead of the LED illumination device is coupled into the optical fiber, the optical fiber then guides the continuous light into the optical modulator for signal modulation, the optical modulator loads a modulation coding signal on the continuous light, then the optical modulator emits modulated light to the optical fiber, and the optical fiber then emits the modulated light into a free light space for communication; the LED lamp bead is not required to be subjected to signal modulation, an external modulation mode is adopted, high-speed modulation is realized without the limitation of LED modulation bandwidth in the using process, and when the optical modulator adopts an electro-optical modulator, the modulation bandwidth can reach dozens of hundreds of GHz; in addition, the stable light guide performance of the optical fiber enables the modulation signal to realize high-performance-to-noise-ratio transmission.
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 diagram of the internal structure of a system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of a fiber splitter according to the present invention;
FIG. 3 is a schematic diagram of one embodiment of a fiber splitter according to the present invention;
FIG. 4 is a schematic diagram of a usage scenario of non-directional transmission in the present invention;
FIG. 5 is a schematic diagram of an internal structure of an optical fiber coupling-out device for non-directional transmission according to the present invention;
FIG. 6 is a diagram illustrating a usage scenario of directional transmission in the present invention;
FIG. 7 is a schematic diagram of the internal structure of the system according to an embodiment of the present invention; (ii) a
Fig. 8 is a schematic view of a usage scenario of the present invention.
Reference numbers and corresponding part names in the drawings: 1-LED lighting equipment, 101-LED lamp beads, 2-coupling devices, 3-optical fiber coupling devices, 4-first optical fibers, 5-optical fiber beam combiners, 6-second optical fibers, 7-optical modulators, 8-third optical fibers, 9-optical fiber beam splitters, 10-fourth optical fibers, 11-optical fiber coupling devices, 111-optical fiber collimators and 112-lenses.
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.
Researchers find that the modulation bandwidth of the LED is limited by the LED drive circuit and the minority carrier lifetime of the LED and is difficult to reach above GHz level when the LED is directly modulated in the research process; in addition, when a modulation signal is input to the driving circuit of the LED, some unpredictable noise may occur in the driving circuit, which brings many difficulties to commercialization of the LED. Meanwhile, if a plurality of LED signal emission sources are arranged at a plurality of positions, a modulation system needs to be added to each LED at each position, which also greatly increases the engineering difficulty and cost.
The first embodiment is as follows:
the invention provides an LED visible light communication system, wherein one embodiment is shown in FIG. 1, FIG. 1 is a schematic diagram of the internal structure of the system, a cross section is represented by a shaded part, and the system mainly comprises an LED illumination device 1, N coupling devices 2, N optical fiber coupling devices 3, N first optical fibers 4, a second optical fiber 6, an optical modulator 7, a third optical fiber 8, an optical fiber beam splitter 9, M fourth optical fibers 10 and M optical fiber coupling-out devices 11;
the LED lighting equipment comprises one or more LED lamp beads 101, continuous light is emitted from the one or more LED lamp beads 101, the continuous light enters the N optical fiber coupling devices 3 through the N coupling devices 2, each optical fiber coupling device 3 is connected with a first optical fiber 4, and the continuous light enters the N first optical fibers 4; the coupling device 2 can adopt an optical lens and is used for converging divergent continuous light emitted by the LED lamp bead 101 to the optical fiber coupling device 3, the optical fiber coupling device 3 guides the continuous light into the first optical fiber 4 correspondingly connected with the optical fiber coupling device 3, and the optical fiber coupling device 3 generally adopts a common optical fiber collimator; the N first optical fibers 4 are coupled to the second optical fiber 6, and the continuous light enters the second optical fiber 6 after passing through the N first optical fibers 4, in this embodiment, because there are a plurality of first optical fibers 4, an optical fiber combiner is preferably used for coupling the N first optical fibers 4 and the second optical fiber 6, and an optical fiber combiner 5 is already marked in fig. 1 illustrated in this embodiment; the other end of the second optical fiber 6 is connected with an optical modulator 7, continuous light enters the optical modulator 7, the optical modulator 7 performs signal modulation on the continuous light, the continuous light is modulated into modulated light, the optical modulator 7 can load communication information to be sent on the continuous light in the modes of amplitude modulation, pulse width modulation, phase modulation and the like, the optical modulator 7 can achieve very high modulation bandwidth, and no requirement is made on the parameter performance of an LED;
the emergent end of the optical modulator 7 is connected with the third optical fiber 8, and the optical modulator 7 outputs modulated light to enter the third optical fiber 8; the third optical fiber 8 is connected to an incident port of the optical fiber beam splitter 9, the optical fiber beam splitter 9 comprises M emergent ports, each emergent port is connected with a fourth optical fiber 10, and the modulated light is divided into M parts with the same energy through the optical fiber beam splitter 9 and enters the M fourth optical fibers 10 in a one-to-one correspondence manner; for example, fig. 1 illustrates an embodiment of four fourth optical fibers 10, the optical fiber splitter 9 is provided with four exit ports, the four exit ports are respectively connected to one fourth optical fiber 10, the optical fiber splitter 9 divides the modulated light into four equal parts and guides the four exit ports into the fourth optical fibers 10, the other end of each fourth optical fiber 10 is connected to an optical fiber coupling-out device 11, the optical fiber coupling-out device 11 emits the modulated light carrying the modulated signal to a free light space for communication, and the optical fiber coupling-out device 11 is an optical device capable of guiding the light propagating in the optical fiber to the free light space with a certain numerical aperture. Wherein the numerical values of M and N are not directly related.
It should be noted that the optical fiber splitter 9 may be a module composed of a plurality of splitters, for example, when a light beam needs to be divided into 16 parts, a cascade of five-to-four optical fiber splitters may be used, as shown in fig. 2; or by cascading one-to-two, two-to-eight fiber splitters, as shown in fig. 3.
In the embodiment shown in fig. 1, it is preferable that the coupling means 2 is a microlens, and the N coupling means 2 constitute a microlens array. In the working process, the continuous light emitted by the LED lamp beads is coupled into each optical fiber coupling device 3 by the micro lens array in a one-to-one correspondence manner. Most preferably, the number of the LED lamp beads, the number of the micro lenses and the optical fiber coupling device 3 are the same, and the optical axes of each LED lamp bead, each micro lens and each optical fiber coupling device 3 are aligned and overlapped, so that more continuous light can be collected, and the highest energy utilization rate can be achieved.
In the embodiment shown in fig. 1, the arrangement of the LED lamp beads may be a word line arrangement, or a two-dimensional array arrangement on a plane, and accordingly, the arrangement of the N coupling devices 2 is the same as and optimal to the arrangement of the LED lamp beads.
In a conventional visible light communication system, an intersymbol interference problem among multiple light paths often exists. In the invention adopting optical fiber to guide light, attention is paid to the problem of optical path difference generated among a plurality of optical fibers, and if the lengths of the plurality of optical fibers are different, the optical path difference exists among a plurality of paths of light, so that intersymbol interference of final communication is easily caused. In order to optimize the communication quality of the present invention, preferably, the lengths of the M fourth optical fibers 10 are equal to each other, so that the modulated signals emitted from the optical modulator 7 are carried and coupled out from the optical fiber coupling-out device 11 through the same optical path, thereby avoiding the problem of intersymbol interference caused by the optical fibers.
In the process of receiving and transmitting signals of visible light communication, the visible light communication can be divided into two categories: non-directional transmission and directional transmission; the non-directional transmission is that the modulated light emitted by the system is emitted to a next-level communication receiving unit in a large range with a large field angle; the directional transmission is that the modulated light emitted by the system directionally propagates to the next-stage communication receiving unit with a small field angle.
Fig. 4 shows a schematic view of a usage scenario of the present invention with non-directional transmission, in which the modulated light output from the fiber outcoupling means 11 is divergently illuminated with a large field angle, so that the modulated light is received by the devices 1, 2, 3, 4 and used for communication.
Fig. 5 shows the structure of the fiber outcoupling means 11 in the non-directional transmission, the hatched portion shows the cross section, the fiber outcoupling means 11 is composed of a fiber collimator 111 and a lens 112, and the fiber collimator 111 couples out the modulated light in the fourth optical fiber 10 and guides the light to the lens 112. The lens 112 may employ a negative lens or a negative power lens group for expanding NA, which is capable of expanding the illumination light NA to emit modulated light to a larger range; the lens 112 may also adopt a beam expanding lens, which expands the received modulated light to increase the divergence angle and the beam waist radius thereof, thereby increasing the irradiation range of the fiber coupling-out device 11; other embodiments of the lens 112 with the function of enlarging the illumination range are not described in detail.
Fig. 6 is a schematic diagram of a usage scenario of the present invention adopting directional transmission, in which the fiber outcoupling means 11 is a fiber collimator, the output numerical aperture of the fiber collimator is small, and modulated light output by the fiber outcoupling means 11 is divergently illuminated at a small field angle, so that the device 5 receives the modulated light and is used for communication. Such directional transmission has a small range of acceptance of the modulated optical signal, and the device 5 may be a router, which then propagates the received signal to more communication devices.
Example two:
in practical engineering, if further system simplification and cost reduction are required, the LED illumination light coupling-in part of the present invention may not actually employ multiple coupling devices, thereby saving both coupling devices and fiber coupling devices. In view of the above, the present invention provides another embodiment, as shown in fig. 7, fig. 7 is a schematic diagram of an internal structure of a system, and a shaded portion represents a cross section, and includes an LED illumination apparatus 1, a coupling device 2, a fiber coupling device 3, a first optical fiber 4, a second optical fiber 6, an optical modulator 7, a third optical fiber 8, a fiber splitter 9, M fourth optical fibers 10, and M fiber coupling-out devices 11; the LED lighting device 1 comprises one or more LED lamp beads 101, continuous light is emitted from the one or more LED lamp beads 101, the continuous light enters an optical fiber coupling device 3 through a coupling device 2, the optical fiber coupling device 3 is connected with a first optical fiber 4, and the continuous light enters the first optical fiber 4; since the present embodiment uses a single coupling device 2 to couple the continuous light of the LED lighting device 1 into a single optical fiber coupling device 3, the coupling device 2 of the present embodiment preferably uses an optical lens or an optical lens group with a larger numerical aperture, and the optical fiber coupling device 3 generally uses a common optical fiber collimator, and here, the optical fiber collimator with a larger numerical aperture is also preferably used; the larger the numerical aperture of the coupling device 2 and the optical fiber coupling device 3 is, the stronger the light receiving capacity is, so that the light energy utilization rate of the system is improved;
the first optical fiber 4 is coupled with the second optical fiber 6, continuous light passes through the first optical fiber 4 and then enters the second optical fiber 6, the first optical fiber 4 and the second optical fiber 6 are fused into a whole in a common optical fiber fusion mode, or the first optical fiber 4 and the second optical fiber 6 are originally one optical fiber;
the following optical path is basically the same as the embodiment shown in fig. 1, the second optical fiber 6 is connected to the optical modulator 7, the continuous light enters the optical modulator 7, the optical modulator 7 performs signal modulation on the continuous light, the continuous light is modulated into modulated light, the optical modulator 7 can load communication information on the continuous light by adopting modes of amplitude modulation, pulse width modulation, phase modulation and the like, the optical modulator 7 can achieve very high modulation bandwidth, and no requirement is imposed on the parameter performance of the LED; the optical modulator 7 is also connected with a third optical fiber 8, and the optical modulator 7 outputs modulated light to enter the third optical fiber 8; the third optical fiber 8 is connected to an incident port of the optical fiber beam splitter 9, the optical fiber beam splitter 9 comprises M emergent ports, each emergent port is connected with a fourth optical fiber 10, and the modulated light is divided into M parts through the optical fiber beam splitter 9 and enters the M fourth optical fibers 10 in a one-to-one correspondence manner; each fourth optical fiber 10 is connected with an optical fiber coupling-out device 11, and the M optical fiber coupling-out devices 11 emit modulated continuous light carrying modulation signals to a free optical space for communication; which is illustrated with four exit ports and four fourth optical fibers 10.
The embodiment shown in fig. 7 has advantages in that the system is simplified and the cost is reduced compared to the embodiment shown in fig. 1, but has a disadvantage in that the energy utilization rate is not as high as that of the embodiment shown in fig. 1, because the coupling device 2 is difficult to collect and couple continuous light of the full field of view of the LED lighting device 1 into the fiber coupling device 3, and especially when the number of LED beads 101 is large, the energy utilization rate of the embodiment shown in fig. 7 is lower.
As in the first embodiment, in order to avoid the inter-symbol interference problem caused by the optical fibers, the lengths of the M fourth optical fibers 10 are equal, so that the modulated signals emitted from the optical modulator 7 are carried through the same optical path and then are coupled out from the optical fiber coupling-out device 11.
When the non-directional transmission is adopted in the present embodiment, the fiber coupling-out device 11 is composed of the fiber collimator 111 and the lens 112, and the schematic view of the usage scenario is the same as that in fig. 4 in the first embodiment, and the structure is the same as that in fig. 5 in the first embodiment.
In the present embodiment, when the directional transmission is adopted, the fiber coupling-out device 11 is a fiber collimator, and the schematic view of the usage scenario is the same as that in fig. 6 in the first embodiment.
Example three:
preferably, the first optical fiber 4, the second optical fiber 6, the third optical fiber 8 and the fourth optical fiber 10 in the above embodiments are all multimode optical fibers, so that each optical fiber can accommodate more modes and transmit light with higher energy. Multi-mode propagation can also be used for mode division multiplexing modulation, thereby bringing system potential that can further improve modulation bandwidth.
Example four:
based on the above embodiments, the present invention has an additional effect, and fig. 8 is a schematic view of a usage scenario of this embodiment, since the optical fiber has very good light transmission capability and can be extended arbitrarily, the optical fiber outcoupling device 11 can be disposed at any desired place, the optical fiber outcoupling device 11 is concentrated on outputting the modulation signal by one optical modulator 7, and the optical fiber outcoupling devices 11 disposed at multiple places are only responsible for light guiding and outcoupling. The invention adopts the optical fiber to guide the continuous light of the LED lighting equipment to the optical modulator to modulate signals, and then the optical fiber is used for coupling light, thereby realizing centralized modulation, and the optical fiber coupling-out device 11 can be arranged at any position due to the convenient light guide function of the optical fiber. In this embodiment, the lengths of the fourth optical fibers 10 are equal to each other, so as to avoid the inter-symbol interference caused by different optical paths of the optical fibers. In a conventional visible light communication system, if signal sources are arranged at multiple places, LED lighting devices with modulation systems are arranged at each place, which increases system cost and system complexity.
In summary, the present invention provides an external modulation system using fiber coupling to realize visible light communication with high-speed modulation, stable modulation, and centralized modulation;
the high-speed modulation is characterized in that: the modulation bandwidth of the LED and the modulation bandwidth of the LED driving circuit do not need to be considered, and the optical modulator can realize high-speed modulation of dozens of hundreds of GHz orders;
the stable modulation is characterized in that: the performance and stability of the LED and an LED driving circuit are not required to be considered, the signal modulation of the whole system is centralized by adopting an optical modulator with stable performance, and the optical modulator can load communication signals on continuous light by adopting various coding modulation modes;
the concentrated modulation is characterized in that: if a plurality of LEDs are required to be arranged, a modulation system is not required to be added to each LED, only one device (an optical modulator) is required to be concentrated to modulate LED illumination light, and modulated light carrying modulation signals after being modulated by the optical modulator is distributed into a plurality of light paths through an optical fiber beam splitter and optical fibers to be emitted to a free light space.
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. An LED visible light communication system, comprising: the LED illumination device comprises LED illumination equipment, N coupling devices, N optical fiber coupling devices, N first optical fibers, second optical fibers, an optical modulator, a third optical fiber, an optical fiber beam splitter, M fourth optical fibers and M optical fiber coupling-out devices;
the LED lighting equipment comprises one or more LED lamp beads, continuous light is emitted from the one or more LED lamp beads, the continuous light enters the N optical fiber coupling devices through the N coupling devices, each optical fiber coupling device is connected with a first optical fiber, and the continuous light enters the N first optical fibers;
the N first optical fibers are coupled with the second optical fiber, and continuous light enters the second optical fiber after passing through the N first optical fibers;
the second optical fiber is connected to the optical modulator, continuous light enters the optical modulator, the optical modulator performs signal modulation on the continuous light, and the continuous light is modulated into modulated light;
the optical modulator is also connected with a third optical fiber, and the optical modulator outputs modulated light to enter the third optical fiber;
the third optical fiber is accessed to an incident port of the optical fiber beam splitter, the optical fiber beam splitter comprises M emergent ports, each emergent port is connected with a fourth optical fiber, and the modulated light is divided into M parts with the same energy through the optical fiber beam splitter and enters the M fourth optical fibers in a one-to-one correspondence manner;
each fourth optical fiber is connected with an optical fiber coupling-out device, and M optical fiber coupling-out devices emit modulated light;
the coupling device adopts a micro lens, and N coupling devices form a micro lens array; the number of the LED lamp beads, the number of the micro lenses and the optical fiber coupling device are the same, and the optical axes of each LED lamp bead, each micro lens and each optical fiber coupling device are aligned and superposed;
the optical fiber coupling-out device consists of an optical fiber collimator and a lens;
the lens adopts a negative lens or a negative focal power lens group for enlarging NA, so that the modulated light irradiates to a larger range;
or, the lens adopts a beam expanding lens, and the beam expanding lens expands the received modulated light to increase the divergence angle and the beam waist radius, so that the irradiation range of the optical fiber coupling-out device is enlarged.
2. An LED visible light communication system according to claim 1, wherein: the M said fourth optical fibers are equal in length to each other.
3. An LED visible light communication system according to claim 2, wherein: the optical fiber coupling-out device is an optical fiber collimator.
4. An LED visible light communication system, comprising: the LED illumination device comprises LED illumination equipment, a coupling device, an optical fiber coupling device, a first optical fiber, a second optical fiber, an optical modulator, a third optical fiber, an optical fiber beam splitter, M fourth optical fibers and M optical fiber coupling-out devices;
the LED lighting equipment comprises one or more LED lamp beads, continuous light is emitted from one or more LED lamp beads, the continuous light enters one optical fiber coupling device through one coupling device, the optical fiber coupling device is connected with a first optical fiber, and the continuous light enters the first optical fiber;
the first optical fiber is coupled with the second optical fiber, and continuous light enters the second optical fiber after passing through the first optical fiber;
the second optical fiber is connected to the optical modulator, continuous light enters the optical modulator, the optical modulator performs signal modulation on the continuous light, and the continuous light is modulated into modulated light;
the optical modulator is also connected with a third optical fiber, and the optical modulator outputs modulated light to enter the third optical fiber;
the third optical fiber is accessed to an incident port of the optical fiber beam splitter, the optical fiber beam splitter comprises M emergent ports, each emergent port is connected with a fourth optical fiber, and the modulated light is divided into M parts with the same energy through the optical fiber beam splitter and enters the M fourth optical fibers in a one-to-one correspondence manner;
each fourth optical fiber is connected with an optical fiber coupling-out device, and M optical fiber coupling-out devices emit modulated light.
5. An LED visible light communication system according to claim 4, wherein: the M said fourth optical fibers are equal in length to each other.
6. An LED visible light communication system according to claim 4, wherein: the optical fiber coupling-out device is composed of an optical fiber collimator and a lens.
7. An LED visible light communication system according to claim 4, wherein: the optical fiber coupling-out device is an optical fiber collimator.
8. An LED visible light communication system according to claim 1 or 4, wherein: the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are all multimode optical fibers.
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