Abstract
In this study, we report a novel method of on-line distributed temperature measurement in optical fibers. The method is based on a cascading fiber Bragg gratings (FBGs) single-ended Brillouin optical time-domain analyzer (BOTDA). This proposal applies the cascading FBGs both as a reflector and an optical filter to improve the signal-to-noise ratio of the single-ended BOTDA. Experimental results show that a 75 km sensing range with 3 °C temperature resolution and 5 m spatial resolution are achieved.
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