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### Optical Engineering

Quasidistributed temperature sensor based on dense wavelength-division multiplexing optical fiber delay
Author(s): Jun Su; Ning Yang; Zhiqiang Fan; Qi Qiu
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Paper Abstract

We report on a fiber-optic delay-based quasidistributed temperature sensor with high precision. The device works by detecting the delay induced by the temperature instead of the spectrum. To analyze the working principle of this sensor, the thermal dependence of the fiber-optic delay was theoretically investigated and the delay-temperature coefficient was measured to be $42.2 ps / km ° C$ . In this sensor, quasidistributed measurement of temperature could be easily realized by dense wavelength-division multiplexing and wavelength addressing. We built and tested a prototype quasidistributed temperature sensor with eight testing points equally distributed along a 32.61-km-long fiber. The experimental results demonstrate an average error of $< 0.1 ° C$ . These results prove that this quasidistributed temperature sensor is feasible and that it is a viable option for simple and economic temperature measurements.

Paper Details

Date Published: 26 October 2017
PDF: 6 pages
Opt. Eng. 56(10) 106112 doi: 10.1117/1.OE.56.10.106112
Published in: Optical Engineering Volume 56, Issue 10
Show Author Affiliations
Jun Su, Univ. of Electronic Science and Technology of China (China)
Ning Yang, Univ. of Electronic Science and Technology of China (China)
Zhiqiang Fan, Univ. of Electronic Science and Technology of China (China)
Qi Qiu, Univ. of Electronic Science and Technology of China (China)