Open AccessHybrid Brillouin/Rayleigh sensor for multiparameter measurements in optical fibers
Author(s) -
Agnese Coscetta,
Ester Catalano,
Enis Cerri,
Nunzio Cennamo,
Luigi Zeni,
Aldo Minardo
Publication year - 2021
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.426427
Subject(s) - brillouin scattering , optical time domain reflectometer , optics , rayleigh scattering , brillouin zone , materials science , optical fiber , distributed acoustic sensing , fiber optic sensor , polarization maintaining optical fiber , physics
We present a hybrid Brillouin/Rayleigh sensor for multiparameter sensing in optical fibers. The system makes use of a single laser pulse to excite both Rayleigh and Brillouin backscattering in the same optical fiber. In the detection path, the backscattered signals are separated based on their different wavelengths. The system is capable of determining simultaneously the Brillouin frequency shift (BFS) of the fiber, as well as the frequency contents of any vibration acting on the same fiber as recovered by phase sensitive OTDR (ϕ-OTDR) measurements. The reported experiments show the possibility to perform simultaneous temperature and vibration measurements, as well as to perform dynamic strain measurements combining the information provided by slope-assisted Brillouin scattering measurements, with those provided by amplitude-based ϕ-OTDR measurements.