自由空间光通信链路最优束散角分析  

Analysis of optimal beam divergence angle of free space optical communication link

作　　者：张慧颖[1] ZHANG Hui-ying(College of Information and Control Engineering,Jilin Institute of Chemical Technology,Jilin 132022,China)

机构地区：[1]吉林化工学院信息与控制工程学院

出　　处：《激光与红外》2019年第8期992-995,共4页Laser & Infrared

基　　金：吉林省教育厅项目(No.JJKH20180561KJ)资助

摘　　要：讨论了FSO通信系统链路最优束散角问题。由空间光通信链路方程得出,减小束散角会增大通信链路裕量。在未对准误差情况下,深入分析偏移角、束散角与链路裕量之间的关系;假设未对准损耗是链路裕量的唯一影响因素的条件下,通过推导得出最大偏移角表达式,当未对准(偏移)角度取得最大值时对应的便是最优束散角。由仿真分析可知,偏移角度的增大导致系统接收光功率减小;对于该系统光束束散角处于1.6 mrad时便是最优束散角。该部分内容研究为对星地的上行和下行通信链路功率计算提供了理论支撑。The optimal beam divergence angle of FSO communication system is discussed in this paper.According to the spatial optical communication link equation,the communication link margin increased with the beam divergence angle reduced.Under the misalignment error,the relationship between offset angle,beam divergence angle and link margin is analyzed.Assuming that the misalignment loss is the only factor affected the link margin,the maximum offset angle expression is derived.When the unaligned(offset)angle reaches its maximum value,the angle is optimal beam divergence angle.The simulation results show that the optical power decreased with the deviation angle increased.when the beam divergence angle of the system is 1.6 mrad,it is the optimal beam divergence angle.This research provides theoretical support for the uplink and downlink communication link power calculation.

关 键 词：FSO 偏移角 最优束散角 链路裕量 

分 类 号：TN929.11[电子电信—通信与信息系统]