Initial light source parameter control device for partial coherent light communication in turbulent atmosphere

Abstract

The invention provides an initial light source parameter control device for partial coherent light communication in a turbulent atmosphere. The device comprises a signal emission unit and a signal reception unit. The signal emission unit is composed of a laser, a laser modulator, a liquid crystal spatial light modulator, an emission optical system and an adjustable diaphragm arranged in a coaxial manner. A signal generator is connected with a BNC port of the laser modulator through a BNC port. A liquid crystal spatial light modulator drive module is connected with the liquid crystal spatial light modulator through a flat cable. A control computer is electrically connected with the liquid crystal spatial light modulator drive module. The device provided by the invention can measure an atmospheric refractivity structural constant, can calculate the optimal initial beam waist width of an emission light beam and the spatial coherent length of the light beam. By applying the device to a long-distance atmosphere channel wireless laser communication system close to the ground, performances of the communication system can be greatly improved, and the application range of the wireless laser communication system can be expanded.

Description

technical field [0001] The invention belongs to the technical field of atmospheric channel wireless laser communication, and relates to an initial light source parameter control device for partially coherent optical communication in turbulent atmosphere. Background technique [0002] Wireless Optical Communication (Wireless Optical Communication), also known as Free-Space Optics (FSO for short), is the product of the combination of optical fiber communication and wireless communication. It uses laser as a carrier to transmit laser signals in the atmosphere to achieve point-to-point, The point-to-multipoint or multipoint-to-multipoint two-way communication technology of voice, data, and image information has the characteristics of large transmission capacity, fast network construction speed, no authorization, and good confidentiality. Atmospheric channel wireless laser communication technology has broad application prospects in the fields of "last mile" access, LAN / MAN expans...

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Problems solved by technology

[0004] The problem to be solved by the present invention is that it can effectively solve the problem of the fading of received optical power caused by the atmosphere in wireless laser communication

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