The research of optical fiber Brillouin spectrum denoising based on wavelet transform and neural network

Zhi-hui Zhang; Wei-liang Hu; Ji-song Yan; Peng Zhang

doi:10.1117/12.2032008

29 August 2013 The research of optical fiber Brillouin spectrum denoising based on wavelet transform and neural network

Zhi-hui Zhang, Wei-liang Hu, Ji-song Yan, Peng Zhang

Proceedings Volume 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography; 891408 (2013) https://doi.org/10.1117/12.2032008
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

The center frequency of Brillouin scattering spectrum is easily influenced by the noise and the measurement accuracy of optical fiber strain is reduced. So a novel denoising method which can be applied in the Brillouin scattering spectrum is developed in this article. The Brillouin scattering spectrum is decomposed into multi-scale detail coefficients and approximation coefficients by using the wavelet transform. The wavelet decomposition detail coefficients are threshold quantified by utilizing the threshold algorithm. At the same time, the wavelet decomposition approximation coefficients are trained and simulated by using the BP neural network in order to remove noise hided in the approximation coefficients. So the novel method can reduce the wavelet decomposition scales. The Brillouin scattering spectrum which has a better denoising effect can be gained by using the inverse wavelet transform, and the measurement accuracy of optical fiber strain is enhanced also. The results of simulation and experiment demonstrate that the proposed method can suppress noise better; accordingly, the new method can gain more precision optical fiber strain and reduce the wavelet decomposition scales effectively than the conventional wavelet denoising method. Theory analysis and experiment show that the method is reasonable and efficient.

Citation Download Citation

Zhi-hui Zhang, Wei-liang Hu, Ji-song Yan, and Peng Zhang "The research of optical fiber Brillouin spectrum denoising based on wavelet transform and neural network", Proc. SPIE 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography, 891408 (29 August 2013); https://doi.org/10.1117/12.2032008

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