Refractive index sensing of melting tapered fiber coupler based on dual-port input

Mengjiao Wang; Shaocui Jiang; Qianqian Ma; Peng Yang; Zenghui Wang; Baojin Peng

doi:10.1117/12.2664400

4 April 2023 Refractive index sensing of melting tapered fiber coupler based on dual-port input

Mengjiao Wang, Shaocui Jiang, Qianqian Ma, Peng Yang, Zenghui Wang, Baojin Peng

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126171H (2023) https://doi.org/10.1117/12.2664400
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

A refractive index sensor based on dual-port input of melting tapered fiber coupler is proposed in this paper. By combining theory and experiment, the influence of the coupling degree of the tapered region on the output mode field and output power of the fiber coupler is studied by finite element method. Two single-mode fibers are connected to custom-made couplers with different spectral ratios, and then the fibers are wounded and melted so that the fiber core is refined, closed and tapered. The mode fieldsof the two fibers are coupled and affect each other to realize the fiber transmission of different powers. By using the taper region structure for refractive index detection, the refractive index range of 1.335to 1.399, the sensor sensitivity of 131.29pm / RIU, and the linear fitting degree of 95.98% were obtained. The structure of the sensor is simple, and the input power can be controlled according to the demand. The production cost is low and has a good application prospect and development value.

Citation Download Citation

Mengjiao Wang, Shaocui Jiang, Qianqian Ma, Peng Yang, Zenghui Wang, and Baojin Peng "Refractive index sensing of melting tapered fiber coupler based on dual-port input", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126171H (4 April 2023); https://doi.org/10.1117/12.2664400

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KEYWORDS

Fiber couplers

Refractive index

Cladding

Sensors

Sensing systems

Single mode fibers

Fiber optics sensors

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