Prediction of Output SNR of Analog Optic Receiver
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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-GaAsFET)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.Abstract: 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 using a low-band filter, which helps to improve the output SNR. The output noise formula of this paper is universally applicable to APD-GaAsFET analog optic receiver.
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[1]恩泽.光纤数字通信接收机[M].北京:人民邮电出版社, 1984. [2]方志豪.晶体管低噪声电路[M].北京:科学出版社, 1984. [3]威廉斯 阿瑟 B. 电子滤波器设计手册[M].北京:电子工业出版社, 1986.
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