关键词: 相位敏感型光时域反射/
光学背景噪声/
光源频漂/
偏振相关噪声
English Abstract
The mechanism and suppression methods of optical background noise in phase-sensitive optical time domain reflectometry
Zhang Xu-Ping1,2,Zhang Yi-Xin1,2,
Wang Feng1,2,
Shan Yuan-Yuan1,
Sun Zhen-Hong1,
Hu Yan-Zhu3
1.Institute of Optical Communication Engineering, Nanjing University, Nanjing 210093, China;
2.Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China;
3.Automation School, Beijing University of Posts and Telecommunications, Beijing 100876, China
Fund Project:Project supported by the National Natural Science Foundation (Grant Nos. 61627816, 61540017, 61405090, 61307096), and the Project of Beijing Financial, China.Received Date:23 January 2017
Accepted Date:26 March 2017
Published Online:05 April 2017
Abstract:Phase-sensitive optical time domain reflectometry (-OTDR) has the advantages of fast response and high sensitivity. Therefore, it can realize fully distributed monitoring of weak vibrations along an optical fiber, which is of great value in many applications such as perimeter security and structural health monitoring. However, the optical background noise in the -OTDR will disturb the extraction of effective signals and limit the performance of this system. The optical background noise mainly includes the laser center frequency drift, the polarization-relevance noise and the distortion measurement due to the nonlinear relationship between optical fiber strain and interference intensity. In this paper, the generating mechanism of these optical background noise was analyzed and the corresponding noise suppression methods were proposed. The experiment results showed that the proposed methods could suppress the optical background noise effectively and improve the sensing performance significantly.
Keywords: phase sensitive optical time domain reflectometry/
optical background noise/
laser frequency drift/
polarization-relevance noise
