Curvature and Temperature Measurement Based on a Few-Mode PCF Formed M-Z-I and an Embedded FBG

Liu, H. and Yang, H.Z. and Qiao, X.G. and Wang, Y. and Liu, X.C. and Lee, Y.S. and Lim, Kok Sing and Ahmad, Harith (2017) Curvature and Temperature Measurement Based on a Few-Mode PCF Formed M-Z-I and an Embedded FBG. Sensors, 17 (8). p. 1725. ISSN 1424-8220

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Official URL: http://dx.doi.org/10.3390/s17081725

Abstract

We have experimentally demonstrated an optical fiber Mach-Zehnder interferometer (MZI) structure formed by a few-mode photonic crystal fiber (PCF) for curvature measurement and inscribed a fiber Bragg grating (FBG) in the PCF for the purpose of simultaneously measuring temperature. The structure consists of a PCF sandwiched between two multi-mode fibers (MMFs). Bending experimental results show that the proposed sensor has a sensitivity of −1.03 nm/m−1 at a curvature range from 10 m−1 to 22.4 m−1, and the curvature sensitivity of the embedded FBG was −0.003 nm/m−1 . Temperature response experimental results showed that the MZI’s wavelength, λa, has a sensitivity of 60.3 pm/° C, and the FBG’s Bragg wavelength, λb, has sensitivity of 9.2 pm/° C in the temperature range of 8 to 100° C. As such, it can be used for simultaneous measurement of curvature and temperature over ranges of 10 m−1 to 22.4 m−1 and 8° C to 100° C, respectively. The results show that the embedded FBG can be a good indicator to compensate the varying ambient temperature during a curvature measurement.

Item Type: Article
Uncontrolled Keywords: Mach-Zehnder interferometers (MZI); Few-mode photonic crystal fiber FBG
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 05 Sep 2018 03:35
Last Modified: 11 Oct 2018 03:31
URI: http://eprints.um.edu.my/id/eprint/19111

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