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Optical Engineering

Quasidistributed fiber Bragg grating sensor network based on self-heterodyne detection technique
Author(s): Sheqiang Zhang; Ming Chen; Qian He; Wei Chen; Hui Chen; Haiou Li
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Paper Abstract

A serial time-division multiplexing optical fiber sensing network with a large multiplexing capacity, which is based on identical ultraweak fiber Bragg gratings (FBGs) and self-heterodyne detection technique, is proposed. An experimental system, which has 10 identical ultraweak FBGs with the same Bragg wavelength of 1550 nm, reflectivity of −36  dB , and bandwidth of 0.1 nm, is set up to investigate the performance of the proposed scheme. The spectra of 10 ultraweak FBGs are resolved with a high accuracy, and the wavelength–temperature sensitivity and temperature resolution of the system are 10.5  pmC , 0.09°C, respectively. A self-heterodyne detection technique is adopted to increase the sensitivity of the receiver, which makes it possible to multiplex over 1000 FBGs along a single optical fiber. Theoretical analyses demonstrate that this sensing scheme can effectively increase the multiplexing capacity and measurement accuracy.

Paper Details

Date Published: 20 May 2014
PDF: 7 pages
Opt. Eng. 53(5) 057107 doi: 10.1117/1.OE.53.5.057107
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Sheqiang Zhang, Guilin Univ. of Electronic Technology (China)
Ming Chen, Guilin Univ. of Electronic Technology (China)
Qian He, Guilin Univ. of Electronic Technology (China)
Wei Chen, FiberHome Telecommunication Technologies Co., Ltd. (China)
Hui Chen, Guilin Univ. of Technology (China)
Haiou Li, Guilin Univ. of Electronic Technology (China)

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