Title :
Improvement of Signal-to-Noise Ratio in the Chaos Correlation OTDR
Author :
Wang, Bing-Jie ; Wang, An-Bang ; Wang, Hua-Kui ; Wang, Yun-Cai
Author_Institution :
Inst. of Optoelectron. Eng., Taiyuan Univ. of Technol., Taiyuan, China
Abstract :
We demonstrate some methods to improve the correlation performance and signal-to-noise ratio (SNR) of chaos correlation OTDR. By inserting a fiber ring resonator in the external cavity of laser diode with optical feedback, we optimize the chaotic laser source to eliminate the high side-lobe corresponding to the length of external cavity. The side-lobe noise of correlation trace induced by the randomness of chaotic signal and other noise interferences will limit the SNR and measurement range of chaos correlation OTDR. We also show that this limitation can be mitigated by using the wavelet de-noising method and the correlation average discrete-component elimination algorithm.
Keywords :
fibre lasers; laser cavity resonators; laser feedback; laser noise; light interference; optical chaos; optical correlation; optical time-domain reflectometry; ring lasers; semiconductor lasers; SNR; chaos correlation OTDR; chaotic laser source; chaotic signal randomness; correlation average discrete-component elimination algorithm; correlation performance; correlation trace; external cavity; fiber ring resonator; laser diode; measurement range; noise interferences; optical feedback; side-lobe noise; signal-to-noise ratio; wavelet denoising method; Chaos; Correlation; Noise measurement; Optical fibers; Pollution measurement; Signal to noise ratio;
Conference_Titel :
Photonics and Optoelectronics (SOPO), 2012 Symposium on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-0909-8
DOI :
10.1109/SOPO.2012.6271059
