模拟光接收机输出信噪比的计算  

Prediction of Output SNR of Analog Optic Receiver

作　　者：倪楠[1] 苏国彬[1] 李铮[1] 刘建胜[1] 

机构地区：[1]北京航空航天大学电子工程系

出　　处：《北京航空航天大学学报》2002年第2期144-148,共5页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：对采用雪崩光电二极管和砷化镓场效应管前放组件 (APD GaAs FET)的模拟光接收机而言 ,传输函数幅频特性在阻带不可能是理想的 ,在这种情况下 ,给出了一种分析、计算阻带幅频特性不理想带来的输出信噪比代价的方法 ,并得到了用低通滤波器改善阻带幅频特性时 ,输出信噪比改善的定量关系 .推导出的输出噪声功率表达式对APD GaAsFET模拟光接收机普遍适用 .The amplitude-frequency characteristic of transmission function of APD-GaAsFET analog optic receiver is usually nonideal in stopband. For this reason, the output Signal-Noise Ratio (SNR) is often lowered. A method is proposed to analyze and calculate the lowered output SNR caused by the nonideal stopband characteristic. A quantitative relation is established by using a low-band filter, which helps to improve the output SNR. The output noise formula is universally applicable to APD-GaAsFET analog optic receiver.

关 键 词：输出信噪比 传输特性 模拟传输系统 模拟光接收机 计算 

分 类 号：TN850[电子电信—信息与通信工程]