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Opt Lett. 2012 Feb 1;37(3):323-5. doi: 10.1364/OL.37.000323.

Reflective fiber-optic refractometer based on a thin-core fiber tailored Bragg grating reflection.

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1
Department of Physics, Northwest University, Xi’an, Shaanxi, China. yuemanwu@gmail.com

Abstract

A novel reflective refractometer based on a thin-core fiber (TCF) sandwiched between a leading single-mode fiber (SMF) and a fiber Bragg grating (FBG) imprinted SMF stub was demonstrated. The reflection from the fiber stub occurs in two well-defined wavelength bands, corresponding to the Bragg core mode and cladding modes. The TCF section functions as a tailorable bridge between the FBG core mode reflection and the surrounding refractive index (SRI). Linear response with enhanced sensitivity of 133.26 dB/refractive index unit for temperature-immune SRI measurement within the biologically desirable sensing range of 1.33-1.41 has been achieved via cost-effective power detection.

PMID:
22297340
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