光斑偏移对空间激光通信系统性能的影响  

Effects of beam misalignment on space laser communication systems

作　　者：陆红强[1,2] 赵卫[1] 胡辉[1] 汪伟[1] 谢小平[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院研究生院,北京100039

出　　处：《强激光与粒子束》2011年第4期895-900,共6页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目

摘　　要：为了评估大气湍流、通信平台振动和校装误差等因素引起的光斑偏移现象对空间激光通信系统通信性能的影响,理论计算和实验测量了空间激光通信系统中APD光电转换后的电信号幅值随会聚信号光斑和光电探测器光敏面之间的横向位移、以及探测平面和透镜焦平面之间的离焦量的变化关系,同时给出了系统误码率、信噪比、抖动与相偏移量之间的实测曲线。结果表明,空间激光通信系统性能随横向位移以及离焦量的增加而急剧恶化,且横向位移的影响远大于前后离焦的影响。在实验参数条件下,当系统误码率从10-10变化到10-5时,允许系统横向位移和离焦量分别为0.03和1 mm。In order to predict and estimate the effects of atmospheric turbulence,vibration of terminals and misalignment on space laser communication,the amplitude of detected signals changing with lateral offset（between the center of the focused beam and the center of the photodetector in the detecting plane and defocus（between the detecting plane and the focal plane,are calculated in simulation and measured in experiment,and the fit error rate（BER）,signal-to-noise ratio and jitter of the detected signals changing with lateral offset and defocus are also measured.The results show that the performance of space laser communication systems would deteriorate significantly as the lateral offset and defocus increase,and the lateral offset has more effect.The maximum defocus and lateral offset permitted are 1 mm and 0.03 mm,respectively,with the experimental parameters,when the BER of communication changes from 10-10 to 10-5.

关 键 词：激光通信 光束偏移 误码率 信噪比 

分 类 号：TN929.12[电子电信—通信与信息系统]