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A bent core-offset in-line fiber Mach-Zehnder interferometer (MZIs) is proposed for refractive index (RI) sensing. After simply bending, not only the RI sensitivity but also the temperature sensitivity can be enhanced as the bending radius decreases. To solve the cross-sensitivity problem, a simultaneous measurement of RI and temperature was carried out. When the bending radius is 35.64mm, the highest RI sensitivity of -44.55nm/RIU for the RI range from 1.333 to 1.373, and the highest temperature sensitivity of 0.0799nm/℃ for the temperature range from 25℃ to 60℃ were measured simultaneously.
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Bingcheng Wu, Haiyang Bao, Yanfei Zhou, Yuan Liu, Jie Zheng, "Simultaneous measurement of refractive index and temperature based on bent core-offset in-line fiber Mach-Zehnder interferometer," Proc. SPIE 11901, Advanced Sensor Systems and Applications XI, 119010G (9 October 2021); https://doi.org/10.1117/12.2601197