卡塞格伦光学天线收发隔离度分析与测试  

Transmit-receive Isolation Analysis and Test of Cassegrain Optical Antenna

作　　者：夏方园[1,2,3] 杨建峰 幺周石[3] 李帅[3] 汪波[3] 陈祥[3] 

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院大学,北京100049 [3]西安空间无线电技术研究所,西安710100

出　　处：《光子学报》2017年第10期59-64,共6页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61231012)资助~~

摘　　要：根据激光通信系统中捕跟和通信探测器的实际应用情况,分别使用消光比和单像元信噪比两种方案评价卡塞格伦光学天线的收发隔离能力,提出了在卡塞格伦光学天线次镜打孔和增加光陷阱的方式抑制后向散射的方法.推导得出当卡塞格伦光学天线次镜开孔的孔径比为0.1~0.3时不影响发射效率,测试结果表明:改进后的卡塞格伦光学天线收发隔离度优于-40dB,并满足激光通信系统光学天线捕跟和通信的使用要求.Two schemes such as single pixel signal to noise ratio and extinction ratio are used to evaluate transmit-receive isolation ability based on the practical application of the tracking and communication detector in laser communication system.A method to inhibit the back scattering light was presented which boring a hole in the secondary mirror and increasing light trap.It is derived that when aperture ratio of secondary mirror Kis 0.1~0.3,it dose not affect the emission efficiency,the measured results show that the improved Cassegrain optical antenna Transmit-Receive isolation is lower than-40 dB while not affecting the emission efficiency of system,and meet the requirements of laser communication system acquiring,tracking and communication.

关 键 词：光通信 杂散光 隔离度 消光比 发射效率 

分 类 号：TN929.13[电子电信—通信与信息系统]