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Title: Bragg grating assisted Sagnac interferometer in SiO2-Al2O3-La2O3 polarization-maintaining fiber for strain-temperature discrimination
Authors: Wu, Zhifang
Wu, Peili
Kudinova, Maryna
Zhang, Hailiang
Shum, Perry Ping
Shao, Xuguang
Humbert, Georges
Auguste, Jean-Louis
Dinh, Xuan Quyen
Pu, Jixiong
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Wu, Z., Wu, P., Kudinova, M., Zhang, H., Shum, P. P., Shao, X., . . . Pu, J. (2020). Bragg grating assisted Sagnac interferometer in SiO2-Al2O3-La2O3 polarization-maintaining fiber for strain-temperature discrimination. Sensors, 20(17), 4772-. doi:10.3390/s20174772
Project: NRF-CRP13-2014-05
Journal: Sensors
Abstract: Polarization-maintaining fibers (PMFs) have always received great attention in fiber optic communication systems and components which are sensitive to polarization. Moreover, they are widely applied for high-accuracy detection and sensing devices, such as fiber gyroscope, electric/magnetic sensors, multi-parameter sensors, and so on. Here, we demonstrated the combination of a fiber Bragg grating (FBG) and Sagnac interference in the same section of a new type of PANDA-structure PMF for the simultaneous measurement of axial strain and temperature. This specialty PMF features two stress-applied parts made of lanthanum-aluminum co-doped silicate (SiO2-Al2O3-La2O3, SAL) glass, which has a higher thermal expansion coefficient than borosilicate glass used commonly in commercial PMFs. Furthermore, the FBG inscribed in this SAL PMF not only aids the device in discriminating strain and temperature, but also calibrates the phase birefringence of the SAL PMF more precisely thanks to the much narrower bandwidth of grating peaks. By analyzing the variation of wavelength interval between two FBG peaks, the underlying mechanism of the phase birefringence responding to temperature and strain is revealed. It explains exactly the sensing behavior of the SAL PMF based Sagnac interference dip. A numerical simulation on the SAL PMF's internal stress and consequent modal effective refractive indices was performed to double confirm the calibration of fiber's phase birefringence.
ISSN: 1424-8220
DOI: 10.3390/s20174772
Schools: School of Electrical and Electronic Engineering 
Rights: © 2020 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
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