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Proceedings Paper

High-speed identical weak fiber Bragg grating interrogation system using DFB laser
Author(s): Chun Zhang; Siqi Liu; Yiming Wang; Jiapei Liu; Honghai Wang; Zhengying Li
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Paper Abstract

A high-speed fiber Bragg grating (FBG) interrogation system is realized by using the high-speed sweep characteristic of Distributed feedback (DFB) laser to constitute a high-speed wavelength-swept laser. To solve the problem of narrow scanning width of the DFB laser and low reuse capacity of the system, the method of building a time division multiplexing (TDM) sensor network with identical weak fiber Bragg grating is proposed. By using the transmission delay of light between the gratings to separate the grating reflection spectrum in time-domain and demodulating the reflection scanning spectrum of each grating to realize the wavelength demodulation. Experimental results show that, under a constant interrogation frequency on 100kHz of the system, 10 identical weak FBGs with the center wavelength of 1553.7nm and reflectivity of 1% have achieved demodulation in a single fiber. And within the temperature range from 25°C to 79°C the linearity of each FBG’s center wavelength varying with the temperature reaches 0.99 .

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103236K (23 April 2017); doi: 10.1117/12.2263548
Show Author Affiliations
Chun Zhang, Wuhan Univ. of Technology (China)
Siqi Liu, Wuhan Univ. of Technology (China)
Yiming Wang, Wuhan Univ. of Technology (China)
Jiapei Liu, Wuhan Univ. of Technology (China)
Honghai Wang, Wuhan Univ. of Technology (China)
Zhengying Li, Wuhan Univ. of Technology (China)


Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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