Fibreoptic distributed temperature sensor with spectral eltration by directional ebre couplers

摘要

We demonstrate a Raman-based all-ebre temper- ature sensor utilising a pulsed erbium ebre laser. The sensor is made of a standard single-mode telecom ebre, SMF-28, and includes a number of directional couplers as band-pass elters. The temperature proele along a 7-km ébreoptic line is measured with an accuracy of 2 8C and a spatial resolution of 10 m. In data processing, we take into account the difference in attenuation between the spectral components of the backscatter signal.