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一种基于电-光强度调制的负反馈解调光纤通信方法

DOI: 10.13232/j.cnki.jnju.2015.04.001, PP. 659-664

Keywords: 纤通信,非线性效应,负反馈解调

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Abstract:

在模拟信号光纤通信系统中,链路的线性化程度和增益大小直接影响传输系统的性能,而这两种特性在很大程度上取决于链路中电信号调制和解调的方式。传统的传输方法是在发送端使用强度调制器对光信号进行强度调制,然后在接收端使用光电探测器实现电信号的解调。然而,由于传统方法中系统传递函数所固有的非线性效应,系统解调后的传输电信号质量会明显下降,产生信号失真,同时,系统的传输增益也较低,一般不超过-20db。本文针对上述传统方法中的缺陷,提出了一种基于负反馈解调机制的模拟信号光纤通信方法。该方法能够显著地减少电-光调制过程中所产生的非线性效应,同时提高了信号输出增益。经过一系列的数学推导,得到了关于该系统传输性能的解析表达式,并通过与数值仿真结果相比较,验证了该解析表达式的准确性和该传输系统的性能优越性。

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