16 February 2018 151-km single-end phase-sensitive optical time-domain reflectometer assisted by optical repeater
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Abstract
A phase-sensitive optical time-domain reflectometry ( ϕ OTDR ) system that can detect intrusion over 150 km is presented. The ϕ OTDR system uses nonbalanced optical repeaters to extend the sensing distance. The repeater consists of two erbium-doped optical fiber amplifiers (EDFAs) and one Raman amplifier (RA). One EDFA power amplifier amplifies the forward-transmitting pulse, and one EDFA preamplifier is used for the backscattering signal, respectively. The RA helps keeping the power along the fiber stable. The optical repeater is installed at the connection of two adjacent fibers to compensate the power decline due to fiber loss. It is easy to install the repeater midway among the fiber links in the system for longer-distance sensing since there is no need of modifying the original sensing system. The theoretical analysis of the repeater is given to describe its effect on the distributed sensing. In experiments, several ϕ OTDR traces show a good agreement with theoretical results. Using the optical repeater, 35-Hz vibration at 151 km is successfully measured with signal-to-noise ratio of 8 dB without extra signal processing.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Muping Song, Weiji Zhu, Qiaolan Xia, Cong Yin, Yan Lu, Ying Wu, Shouwang Zhuang, "151-km single-end phase-sensitive optical time-domain reflectometer assisted by optical repeater," Optical Engineering 57(2), 027104 (16 February 2018). https://doi.org/10.1117/1.OE.57.2.027104 . Submission: Received: 4 November 2017; Accepted: 31 January 2018
Received: 4 November 2017; Accepted: 31 January 2018; Published: 16 February 2018
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