Gas refractometer based on an S-taper fiber tailored fiber Bragg grating

Zhihua Shao; Weijia Bao; Xueguang Qiao; Qiangzhou Rong

doi:10.1117/12.2194523

28 September 2015 Gas refractometer based on an S-taper fiber tailored fiber Bragg grating

Zhihua Shao, Weijia Bao, Xueguang Qiao, Qiangzhou Rong

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96340R (2015) https://doi.org/10.1117/12.2194523
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

A fiber Bragg grating (FBG)-based gas refractometer is proposed and demonstrated experimentally. The configuration consists of a short section of S-type taper followed with a FBG. The S-taper is capable to couple the core mode to cladding modes into the downstream SMF, and the low-order cladding modes can be reflected back to the fiber core via the FBG, in which the recoupling efficiency is highly dependent on surrounding refractive index (RI) of liquid and gas. Experimental results show that some recoupled cladding modes show high sensitivities to surround RI. This power-referenced RI measurement and wavelength-referenced temperature measurement have been achieved via selective cladding modes monitoring.

Citation Download Citation

Zhihua Shao, Weijia Bao, Xueguang Qiao, and Qiangzhou Rong "Gas refractometer based on an S-taper fiber tailored fiber Bragg grating", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96340R (28 September 2015); https://doi.org/10.1117/12.2194523

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KEYWORDS

Cladding

Fiber Bragg gratings

Sensors

Temperature metrology

Liquids

Single mode fibers

Nitrogen

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