Open AccessSingle-measurement digital optical frequency comb based phase-detection Brillouin optical time domain analyzer
Author(s) -
Chi Jin,
Liang Wang,
Yuli Chen,
Nan Guo,
W.H. Chung,
Ho Yin Au,
Zhaohui Li,
Hwa Yaw Tam,
Chao Lu
Publication year - 2017
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.25.009213
Subject(s) - optics , spectrum analyzer , brillouin zone , brillouin scattering , fiber optic sensor , optical fiber , materials science , time domain , distributed acoustic sensing , sweep frequency response analysis , signal (programming language) , frequency domain , image resolution , phase (matter) , physics , acoustics , computer science , quantum mechanics , computer vision , programming language
A single-measurement sweep-free distributed Brillouin optical time domain analyzer (BOTDA) sensor based on phase detection is proposed and experimentally demonstrated employing digital optical frequency comb (DOFC) probe signal. Brillouin Phase Spectrum (BPS) of DOFC probe induced by Brillouin interaction is measured using coherent detection in a single acquisition, without any frequency scanning and data averaging. Single-measurement BOTDA sensor based on BPS in 10km long fiber is demonstrated with a response time of 100 μs, which is limited only by the fiber length. The spatial resolution is 51.2m, determined by the duration of DOFC. And the Brillouin frequency shift (BFS) uncertainty is estimated to be~1.5 MHz at the end of fiber under test (FUT). Benefiting from the fast response time, dynamic measurement up to 1 kHz vibration frequency has been demonstrated.