Open AccessVector optical-chirp-chain Brillouin optical time-domain analyzer based on complex principal component analysis
Author(s) -
Jingdong Zhang,
Huifeng Zheng,
Hua Wu,
Nan Guo,
Guolu Yin,
Tao Zhu
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.402803
Subject(s) - brillouin zone , optics , spectrum analyzer , brillouin scattering , chirp , polarization (electrochemistry) , time domain , frequency domain , materials science , optical fiber , domain analysis , heterodyne detection , physics , computer science , chemistry , laser , software construction , software , software system , computer vision , programming language
A vector optical-chirp-chain (OCC) Brillouin optical time-domain analyzer (BOTDA) based on complex principal component analysis (CPCA) is proposed and experimentally demonstrated by employing a four-tone OCC probe with two orthogonal polarization states. The polarization-fading-free complex Brillouin spectrum (CBS) of the vector OCC-BOTDA is obtained by combining the amplitude and phase response spectra of the probe wave at both Brillouin gain and loss region. We utilize the CPCA method to determine the Brillouin frequency shift (BFS) directly using the measured CBS, and the sensing accuracy is improved by a factor of up to 1.4. The distributed temperature sensing is demonstrated over a 20 km standard single-mode fiber with a 6 m spatial resolution and less than 1 MHz frequency uncertainty under 10 times of trace averaging.