Study on the Detection Signal of OTDR Based on Wavelet Denoising and Approximate Entropy
Wengang Hu, Shengpeng Wan, Bao-ji Li, Lin Zhong, Wei Bo Yu · 2012
OTDR is used to test the fiber optic link attenuation, providing the attenuation details about the length, due to link the noise interference somewhere and signal mutations, cause OTDR test curve could distortion and failed to reflect attenuation characteristics of optical fiber. In this paper, the two kinds of typical OTDR detection signal events are simulated, through the use of wavelet decomposition and reconstruction realize noise elimination, improve curve dynamic range and introduce approximate entropy characterized quantitatively the chaos of the signal level, and the results show that by using the approximate entropy can be very good evaluation wavelet denoising degree.