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Sensors 2019, 19(1), 205; https://doi.org/10.3390/s19010205

In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending

Hubei Province Engineering Research Center for Intelligent Micro-Nano Medical Equipment and Key Technologies, School of Electrical and Electronics Engineering, Wuhan Textile University, Wuhan 300020, China
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Received: 19 November 2018 / Revised: 20 December 2018 / Accepted: 27 December 2018 / Published: 8 January 2019
(This article belongs to the Special Issue Optical Sensing Based on Microscale Devices)
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Abstract

A highly sensitive directional bending sensor based on a three-core fiber (TCF) Mach-Zehnder interferometer (MZI) is presented in this study. This MZI-based bending sensor was fabricated by fusion-splicing a section of TCF between two single-mode fibers (SMF) with core-offset. Due to the location of the core in the TCF, a bend applied to the TCF-based MZI led to an elongation or shortening of the core, which makes the sensor suitable for directional bending measurement. To analyze the bending characteristics, two types of TCF-based sensors, with the fusion-spliced core located at different positions between the SMFs, were investigated. A swept source was employed in the measurement technique. The experimental results showed that, for the two types of sensors in this setup, the bending sensitivities of the two sensors were 15.36 nm/m−1 and 3.11 nm/m−1 at the bending direction of 0°, and −20.48 nm/m−1 and −5.29 nm/m−1 at the bending direction of 180°. The temperature sensitivities of the two sensors were 0.043 nm/°C and 0.041 nm/°C, respectively. The proposed sensors are compact, versatile, inexpensive to fabricate, and are expected to have potential applications in biomedical sensing. View Full-Text
Keywords: three-core fiber; Mach-Zehnder interferometer; bending sensitivities; bending direction; fiber optic sensors three-core fiber; Mach-Zehnder interferometer; bending sensitivities; bending direction; fiber optic sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ding, L.; Li, Y.; Zhou, C.; Hu, M.; Xiong, Y.; Zeng, Z. In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending. Sensors 2019, 19, 205.

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