Refractive index sensing measurement based on periodically tapered small core singlemode fibre

Pengfei Wang; Gilberto Brambilla; Ming Ding; Lin Bo; Yuliya Semenova; Qiang Wu; Gerald Farrell

doi:10.1117/12.971211

17 October 2012 Refractive index sensing measurement based on periodically tapered small core singlemode fibre

Pengfei Wang, Gilberto Brambilla, Ming Ding, Lin Bo, Yuliya Semenova, Qiang Wu, Gerald Farrell

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84211S (2012) https://doi.org/10.1117/12.971211
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

An all-fibre refractive index sensor with a simple periodical tapers configuration is proposed and investigated experimentally. The proposed fibre refractive index sensor consists of a small core singlemode fibre with tapers periodically fabricated along the fibre using a focused CO₂ laser beam, and sandwiched between two standard singlemode fibres. Such a structure can be used for sensing of refractive index by measuring the dip wavelength shift of the multimode interference within the small core fibre cladding. A minimum sensitivity of 125 nm/RIU is measured for a refractive index of 1.33 and a maximum sensitivity of 383 nm/RIU for a refractive index of 1.38. The proposed refractive index sensor benefits from simplicity and low-cost and achieves a competitive sensitivity compared with other fibre-optic sensors.

Citation Download Citation

Pengfei Wang, Gilberto Brambilla, Ming Ding, Lin Bo, Yuliya Semenova, Qiang Wu, and Gerald Farrell "Refractive index sensing measurement based on periodically tapered small core singlemode fibre", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84211S (17 October 2012); https://doi.org/10.1117/12.971211

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