多跨距非线性光纤链路中的小波去噪  

Wavelet Denoising Applied in Multi-Span Nonlinear Fiber Links

作　　者：邵群峰[1] 漆晓琼[1] 张晓萍[1] 

机构地区：[1]兰州大学信息科学与工程学院现代通信技术研究所,甘肃兰州730000

出　　处：《中国激光》2009年第3期592-596,共5页Chinese Journal of Lasers

基　　金：新世纪优秀人才支持计划(NCET-04-0981)资助项目

摘　　要：在多跨距幅度调制光纤传输链路的接收端利用光滤波器对输出信号进行小波分解,并根据小波阈值去噪的原理,对输出信号在光域内进行小波去噪,以消除掺铒光纤放大器(EDFA)引入的放大自发辐射(ASE)噪声和光纤色散及非线性相互作用所产生的非线性噪声对信号的干扰。仿真模拟了三种不同光纤链路传输后输出信号的小波去噪,并在常见的色散补偿链路系统中与带通滤波去噪进行了比较。仿真结果说明了在光域内采用小波阈值去噪法的有效性和可行性,为提高全光通信系统的通信质量和容量提供了新的思路。Optical wavelet decomposition was applied to the received amplitude-modulated signal transmitted through multi-span fiber links. Then the signal including nonlinear noise induced by the interaction of fiber nonlinearity and amplified spontaneous emission (ASE) noise was denoised in accordance with the theory of wavelet threshold denoise by means of optical filters. The procession mentioned above was simulated in three different fiber links and the signals after wavelet denoising and band-pass filter denoising respectively were compared in a common dispersion compensation system. The validity and feasibility of optical wavelet denoising was proved by the simulation results. It provides a novel solution to improve the quality and capacity of all-optic fiber communication systems.

关 键 词：光通信 非线性噪声 小波阈值去噪 全光通信系统 

分 类 号：TN929.11[电子电信—通信与信息系统]