Open AccessHighly sensitive in-fiber interferometric refractometer with temperature and axial strain compensation
Author(s) -
Jérémie Harris,
Ping Lu,
Hugo Larocque,
Yingke Xu,
Liang Chen,
Xiaoyi Bao
Publication year - 2013
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.21.009996
Subject(s) - optics , refractometer , interferometry , materials science , refractive index , cladding (metalworking) , wavelength , optical fiber , fiber optic sensor , graded index fiber , physics , metallurgy
A novel fiber-optic refractometer is proposed and demonstrated to achieve temperature- and axial strain-compensated refractive index measurement using highly sensitive outer-cladding modes in a tapered bend-insensitive fiber based Mach-Zehnder interferometer. Peak wavelength shifts associated with different spatial frequency peaks are calibrated to obtain a wavelength-related character matrix (λ)M(RI,T,ε) for simultaneous measurement of multiple environmental variables. A phase-related character matrix (Φ)M(RI,T,ε) is also acquired by direct determination of refractive index, temperature, and axial strain induced phase shifts of the corresponding sensing modes.