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| Development of a Multifunctional Optical Fiber Sensor Based on Tapered SNS Structure |
| DU Hao 1 ，FAN Guoliang 1，2，3 ，ZHANG Luqiang 1，2，3*
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1．School of Physical Science and Technology，Inner Mongoha University，Hohhot 010021，China;2． National Demonstration
Center for Experimental Physics Education，Inner Mongoha University，Hohhot 010021，China;3．Key Laboratory of Biophysics and Bioinformatics of Inner Mongolia Autonomous Ｒegion，Inner Mongoha University，Hohhot 010021，China
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Abstract Based on the principle of multimode interference in optical fibers，a high-performance tapered Single-mode-No-core-Single-mode (SNS) fiber sensor was developed using fiber tapering technology．Experimental results demonstrate that the sensor exhibits outstanding performance in both solutionconcentration and environmental temperature detection．Compared to non-tapered fiber sensors，the tapered SNS fiber sensor achieves 57． 26% and 58． 04% improvement in sensitivity for concentration and temperature measurements，respectively． The device shows strong adaptability to various experimental scenarios，and exhibiting negligible cross-interference from temperature variations during concentration measurements．
Furthermore，a real-time optical power-concentration/temperature conversion module was developed，enabling simultaneous multi-parameter measurement with a rapid response time of approximately one second，which provides crucial technical support for commercial applications of this sensing system．
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Published: 25 October 2025
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