(Peer-Reviewed) Advances in phase-sensitive optical time-domain reflectometry
Shuaiqi Liu 刘帅旗 ¹, Feihong Yu 余飞宏 ¹, Rui Hong 洪瑞 ², Weijie Xu 许维杰 ¹, Liyang Shao 邵理阳 ¹, Feng Wang 王峰 ²
¹ Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518000, China
中国 深圳 南方科技大学电子与电气工程系
² Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing University, Nanjing 210023, China
中国 南京 南京大学 智能光传感与调控技术教育部重点实验室
Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has attracted numerous attention due to its superior performance in detecting the weak perturbations along the fiber. Relying on the ultra-sensitivity of light phase to the tiny deformation of optical fiber, Φ-OTDR has been treated as a powerful technique with a wide range of applications.
It is fundamental to extract the phase of scattering light wave accurately and the methods include coherent detection, I/Q demodulation, 3 by 3 coupler, dual probe pulses, and so on. Meanwhile, researchers have also made great efforts to improve the performance of Φ-OTDR. The frequency response range, the measurement accuracy, the sensing distance, the spatial resolution, and the accuracy of event discrimination, all have been enhanced by various techniques.
Furthermore, lots of researches on the applications in various kinds of fields have been carried out, where certain modifications and techniques have been developed. Therefore, Φ-OTDR remains as a booming technique in both researches and applications.