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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。
At the receiving end of multi-span amplitude modulation optical fiber transmission link, the output signal is decomposed by optical filter and denoised according to wavelet threshold. The output signal is denoised by wavelet in the optical domain to eliminate the erbium-doped fiber amplifier (EDFA) introduces the amplification of spontaneous emission (ASE) noise and fiber dispersion and non-linear interaction caused by nonlinear noise on the signal interference. Simulation of three different optical fiber link transmission output signal of the wavelet denoising, and in the common dispersion compensation link system with the band-pass filtering denoising were compared. The simulation results show the effectiveness and feasibility of wavelet threshold denoising in the light domain, and provide a new idea for improving the communication quality and capacity of all optical communication system.