Abstract
Phase-sensitive optical time domain reflectometry (Φ-OTDR) utilizes the back Rayleigh scattered light to realize long-distance and high spatial resolution vibration and acoustic waves detection in the whole sensing fiber. The Φ-OTDR has been widely used in structure health monitoring, gas pipelines preventing digging, etc. For practical applications, because of weak backscattering Rayleigh light and exponentially decreased injecting optical signal along the optical fiber, long distance Φ-OTDR detection is very difficult to realize, so how to extend detecting range meanwhile possessing a relatively high spatial resolution turns into a challenge in Φ-OTDR. We proposed a scheme of adjusting EDFA output optical power to use segmented measurement to improve the performance of Φ-OTDR, which can extend detecting range to several tens of kilometers. A segmental measurement scheme was proposed and the experimental results were presented.
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