Fiber-optic refractometer based on a phase-shifted fiber Bragg grating on a side-hole fiber | Zendy

Qi Zhang | Zendy; Lingling Hu | Zendy; Yuefeng Qi | Zendy; Guigen Liu | Zendy; N. J. Ianno | Zendy; Ming Han | Zendy

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Fiber-optic refractometer based on a phase-shifted fiber Bragg grating on a side-hole fiber

Author(s) -

Qi Zhang,

Lingling Hu,

Yuefeng Qi,

Guigen Liu,

N. J. Ianno,

Ming Han

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.016750

Subject(s) - fiber bragg grating , optics , materials science , fiber optic sensor , polarization maintaining optical fiber , graded index fiber , optical fiber , dispersion shifted fiber , long period fiber grating , phosfos , plastic optical fiber , photonic crystal fiber , demodulation , physics , telecommunications , channel (broadcasting) , computer science

A fiber-optic refractive index (RI) sensor based on a π-phase-shifted fiber-Bragg-grating (πFBG) inscribed on a side-hole fiber is presented. The reflection spectrum of the πFBG features two narrow notches associated with the two polarization modes and the spectral spacing of the notches is used for high-sensitivity RI sensing with little temperature cross-sensitivity. The side-hole fiber maintains its outer diameter and mechanical strength. The side-hole fiber is also naturally integrated into a microfluidic system for convenient sample delivery and reduced sample amount. A novel demodulation method based on laser frequency modulation to enhance the sensor dynamic range is proposed and demonstrated.

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