月地激光通信系统误码率分析  

Bit Error Rate in Lunar-earth Optical Communication systems

作　　者：徐科华[1] 马晶[1] 谭立英[1] 

机构地区：[1]哈尔滨工业大学可调谐激光技术国家重点实验室,黑龙江哈尔滨150001

出　　处：《半导体光电》2005年第1期50-53,57,共5页Semiconductor Optoelectronics

摘　　要：采用雪崩光电二极管(APD)的 Webb Gaussian模型,对月地激光链路跟瞄误差和背景光对误码率的影响进行了理论分析和数值仿真。结果表明,要达到 1×10-6的误码率,跟瞄误差必须控制在15μrad的范围内,脉冲位置调谐(PPM)字每个时间间隙的背景光子数必须控制在20以下。同时,对APD的增益系数进行优化也可以降低误码率。The effects of the pointing error and background light in the lunar-earth laser link on the BER are analyzed by using Webb-Gaussian model of APD (avalanche photodiode) and are also simulated with computer. The result indicates that the pointing error must be controlled within 15 μrad and the number of photons per slot of PPM (pulse position modulation) symbol must be controlled below 20 in order to achieve 1 × 10-6 BER. At the same time, the optimization of the APD's gain can decrease the BER of the lunar-earth laser link.

关 键 词：月地激光链路 背景光 跟瞄误差 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]