Document Type

Article

Rights

This item is available under a Creative Commons License for non-commercial use only

Disciplines

Information Science

Publication Details

Optics Letters, vol. 36, no. 12, pp. 2197-2199, 2011

Abstract

A refractive index (RI) sensor based on a novel fiber structure that consists of a single-mode–multimode–singlemode (SMS) fiber structure followed by a fiber Bragg grating was demonstrated. The multimode fiber in the SMS structure excites cladding modes within output single-mode fiber (SMF) and recouple the reflected cladding Bragg wavelength to the input SMF core. By measuring the relative Bragg wavelength shift between core and cladding Bragg wavelengths, the RI can be determined. Experimentally we have achieved a maximum sensitivity of 7:33nm=RIU (RI unit) at RI range from 1.324 to 1.439.

DOI

10.1364/OL.36.002197

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