Directional bending sensing characteristics of in-line Mach-Zehnder interferometer based on asymmetrical twin-core fiber

Huiping Yang; Binbin Yan; Yanhua Luo; Liwei Yang; Kuiru Wang; Jinhui Yuan; Xinzhu Sang; Gang-Ding Peng

doi:10.1117/12.2642212

19 December 2022 Directional bending sensing characteristics of in-line Mach-Zehnder interferometer based on asymmetrical twin-core fiber

Huiping Yang, Binbin Yan, Yanhua Luo, Liwei Yang, Kuiru Wang, Jinhui Yuan, Xinzhu Sang, Gang-Ding Peng

Author Affiliations +

Proceedings Volume 12321, Advanced Sensor Systems and Applications XII; 123210Z (2022) https://doi.org/10.1117/12.2642212
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

We propose and experimentally demonstrate a simple directional bending sensor based on an in-line Mach-Zehnder interference structure of the single mode fiber (SMF)-multimode fiber (MMF)-asymmetrical twin-core fiber (ATCF)- MMF-SMF. Due to the asymmetric structure in twin-core fiber, this sensor can discriminate different bending directions. The interference spectrum shifts with the change of curvature. Furthermore, the sensor exhibits a linear response with a maximum bending sensitivity of 33.48 and -38.72 nm/m^-1 in the curvature range from 0 to 3.01 m^-1 for bending directions at -x (180°) and +x (0°) directions, respectively. The proposed fiber sensor has great potential in the future Internet of Things (IoT) due to its advantages, such as low cost, compactness, and high bending sensitivity.

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Huiping Yang, Binbin Yan, Yanhua Luo, Liwei Yang, Kuiru Wang, Jinhui Yuan, Xinzhu Sang, and Gang-Ding Peng "Directional bending sensing characteristics of in-line Mach-Zehnder interferometer based on asymmetrical twin-core fiber", Proc. SPIE 12321, Advanced Sensor Systems and Applications XII, 123210Z (19 December 2022); https://doi.org/10.1117/12.2642212

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