Control device for initial light source parameters of partially coherent optical communication in turbulent atmosphere

Abstract

The invention provides an initial light source parameter control device for partially coherent optical communication in turbulent atmosphere, which is composed of a signal transmitting unit and a signal receiving unit; the signal transmitting unit is composed of a coaxially arranged laser, a laser modulator, a liquid crystal spatial light modulator, Composed of emission optical system and adjustable diaphragm, the signal generator is connected with the BNC port of the laser modulator through the BNC port, the liquid crystal spatial light modulator drive module is connected with the liquid crystal spatial light modulator through a cable, and the control computer and the liquid crystal spatial light modulation The electrical connection of the driver module. The invention can measure the structural constant of the atmospheric refractive index, and calculate the optimal initial beam waist width of the emitted light beam and the spatial coherence length of the light beam through a computer. Applying the invention to a long-distance atmospheric channel wireless laser communication system near the ground can greatly improve the performance of the communication system and expand the application range of the wireless laser communication system.

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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