Distributed optical fiber vibration sensing system based on polarization detection

Abstract

A novel distributed optical fiber vibration sensing system based on polarization detection is proposed and demonstrated. A Faraday rotator mirror is employed at the end of the system, which eliminates the slow polarization variation of signal light and only responses to rapid polarization change caused by external vibration interference. Based on the sensing signal characteristics, the location of polarization disturbance point can be detected accurately. Experiments on polarization controller simulation and actual vibration detection show that a higher localization accuracy better than 1% is successfully obtained in 13.8 km, 21.2 km and 35.8 km sensing fibers systems.

Keywords

Light Polarization / Polarization Beam Splitter / Polarization Change / Jones Matrix / Polarization Detection

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This work has been supported by the Natioral Natural Suience Foundation of China (No.60736035), and the National Basic Research Program of China (No.2010CB327603).