Open AccessSpatial-division multiplexed hybrid Raman and Brillouin optical time-domain reflectometry based on multi-core fiber
Author(s) -
Zhiyong Zhao,
Yunli Dang,
Ming Tang,
Li Duan,
Meng Wang,
Hao Wu,
Songnian Fu,
Weijun Tong,
Perry Ping Shum,
Deming Liu
Publication year - 2016
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.24.025111
Subject(s) - reflectometry , brillouin scattering , optics , materials science , brillouin zone , fiber optic sensor , raman scattering , time domain , optical fiber , single mode optical fiber , raman spectroscopy , physics , computer science , computer vision
Spatial-division multiplexed (SDM) hybrid Raman- and Brillouin- optical time-domain reflectometry (RODTR and BODTR) utilizing the multi-core fiber has been proposed and experimentally demonstrated. The solution is proposed in order to overcome the incompatible input pump power required for hybrid ROTDR and BOTDR in single mode fiber (SMF), while ensuring the capability of discriminative measurement between temperature and strain. What's more, the central core has been intentionally chosen to implement BOTDR so as to avoid bending-induced cross-sensitivity on Brillouin frequency shift (BFS) measurement. The proposed system utilizes a single laser source, shared pump generation devices, but separate interrogation fiber channels, thus enabling efficient input power management for the two reflectometry, allowing for simultaneous measurement of spontaneous Raman scattering and Brillouin scattering. The worst temperature and strain resolutions are estimated to be about 2.2 °C and 40 με respectively in 6 km sensing range with 3 m spatial resolution.