The Application of Wavelet Denoise in Sampled Grating Comb Filter

Abstract

This paper based on the theoretical basis of sampled fiber grating, using transfer matrix method to analyze sampled fiber grating. By changing the parameters of sampled fiber grating and simulating its reflective spectrum. Four optical comb filters based on sampled grating were designed. Then the wavelet de-noising principle was introduced. In order to optimize designing of sampling grating comb filter, a filtering analysis and denoising method by using wavelet analysis to denoise was proposed. Finally, the automatic one-dimensional denoising was used with db6 wavelet. It not only denoise reflective spectrum noise, but also play a certain inhibition in the side-lobe interference the signal received. The smooth reflective spectrum can be got after denoising.