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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.
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Qingyu Zou, Bingcheng Wu, Haiyang Bao, Jie Zheng, 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