The Application of EMD Denoising in Sampled Grating Comb Filter Design
In order to design sampled grating comb filter, the effect of sampled fiber grating’s parameters on reflective spectrum was analyzed. Sampled grating comb filter can be applied in the intensive optical communication system. Sampled grating reflective spectrum was simulated by changing the parameters. Four kinds of sampled grating optical comb filter were designed. In order to optimize the function of sampled grating comb filter, a filtering analysis and denoising method by using EMD were proposed. This method divides intrinsic mode function into two modes by EMD. One of mode was that signal components mode play dominant role, the other mode was that inoise component mode plays dominant role. The mode of noise component play dominant role was removed. It can denoise reflective spectrum through restructuring signal. The smooth reflective spectrum and delay spectrum can be got after denoising. So that the peak value of sampled grating can be judged accurately.