Treatment of MZI sensor signal with an improved wavelet neighboring coefficients |
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Authors: | Yong Chen Kun Wang Huan-lin Liu Li-juan Chen Xue Yang |
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Institution: | 1. Key Laboratory of Industrial Internet of Things & Network Control, MOE, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;2. Key Laboratory of Optical Fiber Communication Technology, Nanan District, Chongqing 400065, China |
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Abstract: | In order to gain the wavelength drift of Mach–Zehnder interferometer (MZI) sensor system, achieve the measurement of ambient environment parameters precisely, so, need to treatment optical fiber sensing signal with noise. Firstly, introduce the method of neighborhood wavelet coefficient by analyzing the drawback of traditional wavelet de-noising methods. Secondly, an improved threshold is putted forward based on neighboring coefficients in this paper which is to overcome the shortcomings of traditional wavelet methods. Finally, the threshold function proposed by this paper deal with MZI sensing noisy signal together with improved threshold. The simulation result shows that the new method can get the better signal-to-noise ratios (SNR) and root of mean square error (MSE) simultaneously and gain the reconstruction signal of the higher correlation coefficient (CC). Compared with the soft and hard threshold method, its SNR increases by 2–4 db, and compared with NeighCoeff, its SNR improves by 1.2 db. The peak error is 1.6 pm. So, the system can meet the requirement of improving sensor detection precision. |
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Keywords: | MZI sensor Wavelength demodulation Improved wavelet neighboring coefficients Improved threshold SNR |
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