The denoising of optical feedback self-mixing interferometer signals is studied by comparing the traditional digital filter method and Birge-Massart threshold wavelet method.The theoretical model of optical feedback self-mixing interferometer system is constructed and the denoising effects of the weighted smooth filtering

finite long-unit impulse response filter and the threshold wavelet method are compared by processing the simulated and measured waveforms.The results prove that the threshold wavelet method is better than the other two traditional filtering methods.