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Proceedings Paper

Reflective refractometer based on strong optical coupling between a tilted fiber Bragg grating and a parallel D-shaped fiber
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Paper Abstract

A novel fiber-to-fiber tip-reflection sensing configuration for power-referenced refractometry with the capability to measure surrounding refractive index (SRI) as low as 1.33 is proposed and demonstrated. A short D-shaped fiber stub is parallel adjacent to another unshaped fiber containing a weakly tilted Bragg grating (TFBG). Light from the unshaped fiber can be effectively coupled into the adjacent D-shaped fiber through the TFBG which functions as a "bridge" between the core and cladding. Strong "comb" like cladding modes over a broad wavelength range have been recaptured in D-shaped fiber in reflection. These re-coupled cladding modes show different amounts of power as the SRI changes and the sensitivity is much higher than reported in-fiber sensing schemes, especially for low SRI measurement.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96344I (28 September 2015); doi: 10.1117/12.2194702
Show Author Affiliations
Zhongyue Cai, Jinan Univ. (China)
Tuan Guo, Jinan Univ. (China)
Fu Liu, Jinan Univ. (China)
Bai-Ou Guan, Jinan Univ. (China)
Gang-Ding Peng, Univ. of New South Wales (Australia)
Jacques Albert, Carleton Univ. (Canada)


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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