Title :
Study on the Detection Signal of OTDR Based on Wavelet Denoising and Approximate Entropy
Author :
Hu Wen-gang ; Wan Sheng-peng ; Li Bao-ji ; Zhong Lin ; Yu Wei
Author_Institution :
Key Lab. of Nondestructive Testing (Minist. of Educ.), Nanchang Hangkong Univ., Nanchang, China
Abstract :
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.
Keywords :
entropy; optical chaos; optical distortion; optical fibre testing; optical links; optical signal detection; optical time-domain reflectometry; signal denoising; signal reconstruction; wavelet transforms; OTDR detection signal; OTDR test curve; approximate entropy; attenuation characteristics; chaos; curve dynamic range; fiber optic link attenuation; noise elimination; noise interference; signal level; signal mutations; wavelet decomposition; wavelet denoising; wavelet reconstruction; Attenuation; Entropy; Least squares approximation; Noise; Noise reduction; Optical fibers; Reflection;
Conference_Titel :
Photonics and Optoelectronics (SOPO), 2012 Symposium on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-0909-8
DOI :
10.1109/SOPO.2012.6270509
