Research on Wavelength Demodulation Algorithm for Fiber Bragg Grating Weak Signal Based on Hilbert Transform
摘要
In order to improve the demodulation accuracy of the tunable F-P filter, the Hilbert transform is introduced into the Gauss fit algorithm to solve the problem of sidelobe or peak distortion in the low power and low signal-to-noise ratio. First, digital low-pass filtering is used to complete the data pre-processing, then using the peak-seek algorithm designed in this paper to confirm the peak position of the two signals, and finally using the linear interpolation algorithm to demodulate the FBG center wavelength. Demodulation experiments show that the demodulation method used in this paper has the advantages of small computation, high demodulation accuracy and less than 1 pm peak seeking error.