Investigation of phase-sensitive OTDR trace distortion resulting from the laser frequency drift and its compensation approach

摘要：

　　Phase-sensitive OTDR has the ability to detect dynamic disturbance to fiber at any location by monitoring the interference fading speckle pattern variance of the φ-OTDR trace through continuous probe pulse injection.However, even if no external disturbances are applied on the fiber under test, φ-OTDR trace will keep distorting with time slowly.This trace distortion results in a higher noise level and make it challenging to detect low-frequency external disturbance.In this paper, laser source frequency drift is proved to be a major contributing factor to phase-sensitive OTDR trace distortion.In the experiment, the relative lasers frequency drift can be detected to a precision of 200kHz and an approach is proposed to compensate the trace distortion resulting from laser frequency drift.

关键词： phase-sensitive OTDR distributed monitoring health diagnosis

作者: F.Zhu X.P.Zhang

作者单位: Nanjing University,22 Hankou Road Nanjing Jiangsu 210093 P.R.China

会议类型: 国际会议

会议名称: The 5th International Forum on Opto-electronic Sensor-based Monitoring in Geo-engineering (5th OSMG-2014)(第五届地质(岩土)工程光电传感监测国际论坛

会议地点: 南京

会议语种:英文

页码: 188-191

在线出版日期: 2014-10-12（万方平台首次上网日期，不代表论文的发表时间）