An Optical Communication System Based on Interference Effect and Its Signal Sending and Decoding Method

Abstract

The invention discloses an optical communication system based on interference effect. The optical signal transmitting end includes a light intensity modulator and an optical signal sending array connected to each other. The optical signal receiving end includes a dispersion device, a collimation device, an optical signal receiving device, and a signal processing unit connected to the optical signal receiver, the signal processing unit analyzes and processes the data detected by each pixel element, so that the optical signal receiving end decodes the data sent by the optical signal transmitting end through data analysis and processing signal of. The present invention uses easily available light sources to form an optical signal sending array to carry out parallel transmission of multi-channel signals, and uses dispersion devices and array detection chips combined with a method of solving matrix equations to recover the transmitted multi-channel signals. The light source adopted in the present invention can be used for both communication and illumination, and can only realize any one of these functions. The transmission of large-capacity signals can be realized while realizing the lighting function, and the structure is simple and the cost is low.

Description

technical field [0001] The invention relates to an optical communication system based on interference effect and a signal sending and decoding method thereof, belonging to the technical field of optical communication. Background technique [0002] Optical communication is a communication method in which the information to be conveyed is loaded onto light waves through modulation, and light is used as the information carrier. In recent years, visible light communication (VLC) technology has developed rapidly and has become a new wireless communication method. Visible light communication technology has great potential in the fields of medium and short-distance secure and confidential communication, high-precision and accurate positioning, transportation communication and indoor navigation, especially it can replace radio frequency (RF) to solve the "last 1m" problem. Compared with radio waves, visible light communication has many advantages: (1) The amount of information is d...

AI Technical Summary

Problems solved by technology

For example: (1) In the traditional MIMO visible light communication technology, different channels use different single-frequency signal light sources, but such light sources have a single color and cannot use the white light source used in traditional lighting

(2) Although some MIMO visible light communication technologies can use white light sources, the spectrum of each white light source is required to overlap but not completely the same, so as many channels as there are need to have as many different light sources or filter films, so as to improve cost of the system

(3) There are also some visible light MIMO technologies that use two-dimensional code technology to encode signals, but the coding rules of two-dimensional codes are complicated, so there are special requirements for light source arrangement

Moreover, the signal emission light source can only use a point light source, but cannot use a surface light source, which reduces the comfort of the human eye.

(4) In some technologies adopted by the research group, the optical transmitter needs to precisely control the wavelength, polarization state of the optical carrier or the transmission mode of the incident fiber, and the optical receiving end needs to use a larger detector and place it at a specific angle , or use a complex demultiplexer to separate the wavelength, polarization state, and transmission mode to restore the transmitted data, so the system structure is complex and the cost is high

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