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Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence

A technology of coherent beams and atmospheric turbulence, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as flickering of laser signal light intensity and performance degradation of laser communication systems, and achieve good flexibility and optimal design effects

Inactive Publication Date: 2012-10-17
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0002] Atmospheric turbulence causes the light intensity of the laser signal to flicker, resulting in reduced performance of the atmospheric channel laser communication system

Method used

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  • Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence
  • Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] In this embodiment, the laser 101 is a semiconductor laser with a wavelength of 800nm, and the output TEM 00 The spatially coherent laser signal of the mode, the laser 107 is a semiconductor laser with a wavelength of 808nm, and the output TEM 00 mode, the liquid crystal spatial light modulator 104 is a high-precision pure-phase liquid crystal spatial light modulator produced by Germany Holoeye, the optical transmitting antenna 111 is a Cassegrain telescope, and the optical receiving antenna 201 is a Cassegrain telescope , the photodetector 206 is a picosecond-level avalanche photodiode detector, and the photodetector 208 is a picosecond-level avalanche photodiode detector, and the average atmospheric refractive index structural constant of the path is measured using a scintillator developed by the Anhui Institute of Optics and Mechanics, Chinese Academy of Scie...

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Abstract

The invention discloses a test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence, and belongs to the technical field of laser signal transmission and detection in an atmospheric channel. The test system comprises a light beam emission sub system and a light beam receiving and detecting sub system, wherein different variances are used to count and calculate parameters, so that a scintillation variance of the fake partially coherent light transmitted in the atmosphere turbulence under different detector integral time conditions is calculated. The system and the method provided by the invention can synchronously measure the scintillation variance of coherent lasers transmitted in the atmosphere turbulence, and a correspondence between the measured scintillation variance and an actual structural constant value of atmospheric. The result tested by the system and the method disclosed by the invention is helpful for optimizing the design of the application system using the fake partially coherent light to restrain the scintillation caused by the atmosphere turbulence.

Description

technical field [0001] The invention belongs to the field of laser signal transmission and detection in atmospheric channels, and relates to a test system and method for the scintillation characteristics of pseudo-partially coherent light beam atmospheric turbulence transmission. Background technique [0002] Atmospheric turbulence causes the light intensity of the laser signal to flicker, which degrades the performance of the atmospheric channel laser communication system. The existing research results show that reducing the initial spatial coherence of the laser can effectively suppress the flickering of light intensity caused by atmospheric turbulence and improve the performance of the atmospheric channel laser communication system. In order to control the initial spatial coherence of the laser, in practical applications, a random phase screen is usually used to modulate the wavefront phase of the laser. The laser beam modulated by the random phase screen is called a pseu...

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Application Information

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IPC IPC(8): H04B10/08
Inventor 陈纯毅杨华民蒋振刚娄岩佟首峰范静涛
Owner CHANGCHUN UNIV OF SCI & TECH
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