光相干探测技术在自由空间光通信系统中的应用研究  

Application of optical coherent detection technology in free space optical communication system

作　　者：钟春晓[1] 王锦丽 刘明萍[2] ZHONG Chunxiao;WANG Jingli;LIU Mingping(East China Jiaotong University Institute of Technology,Nanchang 330100,China;Nanchang University,Nanchang 330100,China)

机构地区：[1]华东交通大学理工学院,南昌330100 [2]南昌大学,南昌330100

出　　处：《激光杂志》2018年第7期110-114,共5页Laser Journal

基　　金：江西省自然科学基金:(No.20161BAB212041)

摘　　要：针对传统的通信系统存在的光强闪烁和相位畸变,影响系统通信质量和传输距离的问题,引入光相干探测技术,对自由空间光通信系统进行优化研究。以自由空间光通信传输媒介分析出发,对分析大气湍流的统计特性及影响湍流强度的相关因素,确定大气湍流对自由空间光通信系统的影响,对大气湍流导致通信信号产生光强闪烁和相位畸变的不利影响进行分析,降低激光光束的传输损耗,提高传输距离,实现自由空间光通信系统的研究,在此基础上,确定光相干探测技术在自由空间光通信系统中的应用方法,确定激光光束的强度特性,降低自由空间光通信存在的强光闪烁现象以及相位畸变问题,保证通信质量。实验结果表明,本文所提方法能够较好的解决自由空间光通信系统应用过程中存在的光强闪烁和相位畸变问题,降低自由空间光通信系统信号传输过程中损耗和误码率,提高信号传输距离,保证通信信号传输质量。Aiming at the problems of traditional system such as scintillation and phase distortion,which affect the communication quality and transmission distance of the system. The optical coherence detection technology is introduced to optimize the free space optical communication system. Based on the analysis of free space optical communication transmission medium,the statistical analysis of atmospheric turbulence and correlated factors of turbulence intensity are analyzed to determine the influences of atmospheric turbulence on free space optical communication system. Analyzing the adverse effects of atmospheric turbulence on communication signals generating scintillation and phase distortion to reduce the transmission loss of laser beam and to improve transmission distance. On this basis,ensuring the application method of optical coherent detection technology in free space optical communication system to determine the strength characteristics of the laser beam and to reduce the light flicker and phase distortion. Finally guarantee the communication quality. The experimental results show that the proposed method can better solve the existing scintillation and phase distortion problems in free space optical communication system application process,reduce the loss and the bit error rate of signal transmission and ensure the communication quality of signal transmission.

关 键 词：光相干 探测技术 自由空间 光通信 激光光束强度 

分 类 号：TN929[电子电信—通信与信息系统]