Investigation of a cascading core-offset in-line fiber Mach-Zehnder interferometer for refractive index measurement

Qingyu Zou; Bingcheng Wu; Haiyang Bao; Jie Zheng; Fangda Yu

doi:10.1117/12.2573569

10 October 2020 Investigation of a cascading core-offset in-line fiber Mach-Zehnder interferometer for refractive index measurement

Qingyu Zou, Bingcheng Wu, Haiyang Bao, Jie Zheng, Fangda Yu

Author Affiliations +

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 1155414 (2020) https://doi.org/10.1117/12.2573569
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

A cascading core-offset in-line fiber Mach-Zehnder interferometer (MZI) was proposed to improve the RI sensitivity and eliminate the cross sensitivity between RI and temperature. The sensor was fabricated by cascading a small core-offset inline fiber MZI (the offset displacement is 6μm and interference arm length is 30mm) with a large core-offset in-line fiber MZI (the offset displacement is 40μm and interference arm length is 30mm). By enlarging the offset displacement, the RI sensitivity was improved from -9.177 to 108.326nm/RIU. And the MZIs with two offset displacement offer interference dips with different RI response, by utilizing the interference dips, the simultaneously measurement can be realized to eliminate the cross sensitivity.

Conference Presentation

Citation Download Citation

Qingyu Zou, Bingcheng Wu, Haiyang Bao, Jie Zheng, and Fangda Yu "Investigation of a cascading core-offset in-line fiber Mach-Zehnder interferometer for refractive index measurement", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 1155414 (10 October 2020); https://doi.org/10.1117/12.2573569

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