Open AccessQuasi-distributed refractometer using tilted Bragg gratings and time domain reflectometry
Author(s) -
Christophe Caucheteur,
Marc Wuilpart,
Chengkun Chen,
Patrice Mégret,
Jacques Albert
Publication year - 2008
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.16.017882
Subject(s) - refractometer , optics , fiber bragg grating , refractometry , reflectometry , materials science , refractive index , optical fiber , optical time domain reflectometer , cladding (metalworking) , time domain , fiber optic sensor , optoelectronics , graded index fiber , physics , computer science , metallurgy , computer vision
Tilted fiber Bragg gratings (TFBGs) have been demonstrated to be accurate refractometers as they couple light from the fiber core to the cladding. Because they require spectral measurements on several tens of nanometers, demodulation techniques reported so far are not suited for quasi-distributed refractive index sensing using TFBGs cascaded along a single optical fiber. We demonstrate here that a commercial Optical Time Domain Reflectometer (OTDR) can be used to multiplex identical TFBGs refractometers written in the same optical fiber. Our solution is simple, relatively fast, cost-effective and is particularly interesting for the monitoring of long structures.