| 模拟光接收机输出信噪比的计算 |
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| 引用本文： | 倪楠,苏国彬,李铮,刘建胜.模拟光接收机输出信噪比的计算[J].北京航空航天大学学报,2002,28(2):144-148. |
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| 作者姓名： | 倪楠 苏国彬 李铮 刘建胜 |
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| 作者单位： | 北京航空航天大学,电子工程系,北京,100083 |
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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.
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| 关 键 词： | 信噪比 传输特性 模拟传输系统 |
| 文章编号： | 1001-5965(2002)02-0144-05 |
| 收稿时间： | 2000-06-26 |
| 修稿时间： | 2000年6月26日 |
Prediction of Output SNR of Analog Optic Receiver |
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| NI Nan,SU Guo-bin,LI Zheng,LIU Jian-sheng.Prediction of Output SNR of Analog Optic Receiver[J].Journal of Beijing University of Aeronautics and Astronautics,2002,28(2):144-148. |
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| Authors: | NI Nan SU Guo-bin LI Zheng LIU Jian-sheng |
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| Institution: | Beijing University of Aeronautics and Astronautics, Dept. of Electronic Engineering |
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| 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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| Keywords: | signal noise ratio transmission characteristics analog transmission systems |
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