Long period grating inscribed in multimode fibre interferometer and its application in refractive index sensing

Pengfei Wang; Haoyu Zhao; Gilberto Brambilla; Gerald Farrell; Libo Yuan

doi:10.1117/12.2191126

28 September 2015 Long period grating inscribed in multimode fibre interferometer and its application in refractive index sensing

Pengfei Wang, Haoyu Zhao, Gilberto Brambilla, Gerald Farrell, Libo Yuan

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96346A (2015) https://doi.org/10.1117/12.2191126
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

A long period grating (LPG) is inscribed by a femtosecond laser in the multimode region of a singlemode-multimode-singlemode fibre device to provide a compact refractive index sensor. An average sensitivity of 39 nm/RIU and a resolvable index change of 2.56×10^-4 are obtained experimentally with a 44.4 mm long multimode fibre over a measured refractive index range of 1.33-1.35. Because of its compactness, ease of fabrication, linear response, high sensitivity, easy connectivity to other fiberized optical components and low cost, this refractometer could find various applications in chemical and biological sensing.

Citation Download Citation

Pengfei Wang, Haoyu Zhao, Gilberto Brambilla, Gerald Farrell, and Libo Yuan "Long period grating inscribed in multimode fibre interferometer and its application in refractive index sensing", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96346A (28 September 2015); https://doi.org/10.1117/12.2191126

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