Open AccessFiber-optic refractometer based on a phase-shifted fiber Bragg grating on a side-hole fiber
Author(s) -
Qi Zhang,
Lei 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 , long period fiber grating , optical fiber , phosfos , plastic optical fiber , dispersion shifted 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.