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Initial space coherence self-adaptive control method and system of atmospheric signal path communication laser

A technology for adaptive control and communication systems, applied in transmission systems, free space transmission, electromagnetic wave transmission systems, etc., can solve the problems of reduced beam cross-sectional power density, reduced initial spatial coherence, and reduced beam divergence.

Inactive Publication Date: 2012-06-20
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

On the other hand, the reduction of the initial spatial coherence of communication lasers also leads to faster beam divergence, resulting in a reduction in the power density across the beam cross-section

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  • Initial space coherence self-adaptive control method and system of atmospheric signal path communication laser
  • Initial space coherence self-adaptive control method and system of atmospheric signal path communication laser

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The purpose of the present invention is to provide an adaptive control method and system for the initial spatial coherence of atmospheric channel communication lasers, to achieve optimal control of the initial spatial coherence of communication lasers in the atmospheric channel wireless laser communication system, so as to reduce the atmospheric Effects of laser signal strength fluctuations caused by turbulence on communication system performance. The liquid crystal spatial light modulator 7 in the present invention can choose a high-precision phase-only liquid crystal spatial light modulator produced by Holoeye, Germany. DSP digital signal processor can choose TI's C6000DSP.

[0028] Such as figure 1 As shown, the initial spatial coherence adaptive control system of atmospheric channel communication laser of the present invention comprises a...

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Abstract

The invention discloses an initial space coherence self-adaptive control method and a system of atmospheric signal path communication laser, which belong to the technical field of atmospheric signal path wireless laser communication. The invention generates a two-dimensional random phase screen through the mean and variance data of signals sent from a communication terminal of the other party; the two-dimensional random phase screen serves as a control signal to control a liquid crystal space light modulator to add a random phase before the save of transmitted communication laser, so that the optimal control to the initial space coherence of the communication laser is realized. The invention can significantly reduce the impact of atmospheric turbulence on the wireless laser communication system, and improve the performance of the communication system.

Description

technical field [0001] The invention belongs to the technical field of atmospheric channel wireless laser communication, and relates to an adaptive control method and system for initial spatial coherence of atmospheric channel communication lasers. Background technique [0002] Atmospheric channel wireless laser communication technology has broad application prospects in the fields of "last mile" access, LAN / MAN expansion, emergency command communication, fast communication networking, etc., and is a research hotspot in the current communication field. Atmospheric turbulence causes fluctuations in laser signal strength, resulting in increased link bit error rates. In atmospheric channel wireless laser communication, the use of space partially coherent optical transmission signals can effectively reduce the fluctuation of laser signal intensity caused by atmospheric turbulence and improve the performance of communication links under certain conditions. Therefore, reducing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/10H04B10/11
Inventor 陈纯毅杨华民何飞任志鹏娄岩佟首峰
Owner CHANGCHUN UNIV OF SCI & TECH
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