一种自由空间光通信光路的设计与分析  

Design and Analysis of a Kind of Optical System for Free Space Optical Communication

作　　者：支新军[1] 艾勇[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《半导体光电》2003年第3期197-199,216,共4页Semiconductor Optoelectronics

基　　金：武汉大学科技创新基金(212270047)

摘　　要：提出了一种用于自由空间光通信的光学系统的设计方法,在这种设计方法中通过卡塞格伦天线实现对激光束的准直,通过偏振分光镜和γ/2波片的巧妙使用来减少杂散光和反射光对信号光的干扰,通过对光学系统的自动跟踪控制消除了通信终端的失准问题。分析和实验表明,基于该光学系统的通信终端激光发散角达到0.4 mrad,对准误差小于6μrad,可实现2 km的自由空间光通信。A design method of an optical system for free space optical communication is proposed, in which Cassegrain antenna is used to collimate the laser beam, polarization beam splitter and A/2 plate to decrease the interference of astigmatism and reflex with signal, and further an automatic tracking system is employed to eliminate the pointing error between the communication terminals. Analysis and experiment show that the laser divergence of 0. 4 mrad is obtained for the communication terminals based on the opti...

关 键 词：自由空间光通信 光学天线 偏振分光镜 自动跟踪 

分 类 号：TN929.1[电子电信—通信与信息系统]