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Optical Engineering

Time- and wavelength-division multiplex distributed sensing interrogation system based on distributed feedback laser array and ultraweak fiber Bragg grating
Author(s): Kai Tian; Gen-Xiang Chen; Qiu-Yan Song; Yun-Shu Gao; Hao-Tian Zhang
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Paper Abstract

An interrogation system for large-capacity fiber-distributed sensing was proposed and implemented. The system is based on the time- and wavelength-division multiplexed method and ultraweak fiber Bragg grating (FBG) sensor arrays. A narrow-linewidth tunable light source consisting of a distributed feedback laser array is used, which can be directly modulated into nanosecond pulses with a wide tuning range. Theoretically, the system can achieve a demodulation of > 10,000 gratings and the FBG can be placed closely. An experimental system was implemented and the performance of the established system was tested, including its wavelength demodulation, time-division multiplexing, and temperature-sensing characteristics. The prototype achieved 27-nm wavelength demodulation and successfully demodulated 10 ultraweak grating strings of the same wavelength. By rationally planning the grating network, we can evaluate from the experimental results that the prototype can achieve at least 220 grating demodulation.

Paper Details

Date Published: 9 November 2017
PDF: 8 pages
Opt. Eng. 56(11) 117104 doi: 10.1117/1.OE.56.11.117104
Published in: Optical Engineering Volume 56, Issue 11
Show Author Affiliations
Kai Tian, Beijing Jiaotong Univ. (China)
Gen-Xiang Chen, Minzu Univ. (China)
Qiu-Yan Song, Qufu Normal Univ. (China)
Yun-Shu Gao, Beijing Jiaotong Univ. (China)
Hao-Tian Zhang, Beijing Jiaotong Univ. (China)

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