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28 September 2015 Reflective refractometer based on strong optical coupling between a tilted fiber Bragg grating and a parallel D-shaped fiber
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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96344I (2015) https://doi.org/10.1117/12.2194702
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil
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.
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Zhongyue Cai, Tuan Guo, Fu Liu, Bai-Ou Guan, Gang-Ding Peng, and Jacques Albert "Reflective refractometer based on strong optical coupling between a tilted fiber Bragg grating and a parallel D-shaped fiber", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96344I (28 September 2015); https://doi.org/10.1117/12.2194702
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