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Proceedings Paper

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

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96346A (28 September 2015); doi: 10.1117/12.2191126
Show Author Affiliations
Pengfei Wang, Dublin Institute of Technology (Ireland)
Harbin Engineering Univ. (China)
Haoyu Zhao, Harbin Engineering Univ. (China)
Gilberto Brambilla, Univ. of Southampton (United Kingdom)
Gerald Farrell, Dublin Institute of Technology (Ireland)
Libo Yuan, Harbin Engineering Univ. (China)


Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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