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Indoor visible light OAM multicast communication system

A communication system and transmitter technology, applied in the field of visible light communication, can solve problems such as inability to provide effective lighting, no effective light signal, and inability to apply, and achieve the effect of meeting the transmission needs of small-capacity instant messaging and improving capacity

Active Publication Date: 2017-07-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the existing OAM modulated beam is collimated, it cannot be illuminated
Moreover, there is a dark spot in the center of the OAM beam, and there is no effective light signal at the dark spot, so it cannot be applied in the field of visible light communication, nor can it provide effective illumination

Method used

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  • Indoor visible light OAM multicast communication system
  • Indoor visible light OAM multicast communication system

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Embodiment Construction

[0027] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0028] figure 1 It is a schematic diagram of the transmitting end of the indoor visible light OAM multiplexing LED-LD multicast communication system according to the present invention. Among them, the downlink includes laser LD, LD modulation circuit, two-dimensional laser beam splitter and spatial light modulator:

[0029] The LD modulation circuit is connected to the laser LD for modulating the optical signal sent by the laser according to the multicast data signal;

[0030] The laser, the two-dimensional laser beam splitter and the spatial light modulator are connected in sequence, each output optical path of the two-dimensional laser beam splitter corresponds t...

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Abstract

The invention discloses an indoor visible light OAM multicast communication system. The downlink of the system generates, by a laser device LD, a Gaussian beam in which multicast information is modulated. A collimated laser is converted into an OAM beam with a spiral phase via a two-dimensional laser beam splitter and a spatial light modulator. When modulating the spiral phase of the OAM beam, the spatial light modulator expands the coverage area of each beam by spinning the beam. Further, the irradiation areas of respective beams are overlapped so as to compensate for the central dark spot of a single beam, thereby achieving non-blind area transmission. For the multicast communication system, uplink communication is performed by means of an LED wavelength division multiplexing mode so as to achieve non-blind area two-way data interaction in a system. In addition, the indoor visible light OAM multicast communication system can greatly improve the communication capacity of the downlink of the system by using an OAM multiplexing technique, and is higher in communication efficiency.

Description

technical field [0001] The invention relates to the field of visible light communication, in particular to an indoor visible light multicast communication transmitting end for solving OAM blind spots. Background technique [0002] Visible light communication uses the visible light band as the information carrier. Because of its advantages of rich spectrum resources, green environmental protection, safety, and no need for cable channel transmission such as optical fibers, it has always been a hot research topic. With the advent of Industry 4.0 in recent years, the era of big data and the widespread application of cloud platform computing make visible light communication bring new experiences and innovations in the Internet of Things, smart cities, etc., and have greater research value. [0003] The important indicators to measure the performance of indoor visible light communication system are transmission capacity, transmission distance, communication range and whether two-w...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/556
CPCH04B10/116H04B10/5561
Inventor 孙小菡赵永星
Owner SOUTHEAST UNIV
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