Open AccessOvercoming EDFA slow transient effects in a combined Golay coding and coherent detection BOTDA sensor
Author(s) -
Can Liu,
Lianshan Yan,
Zonglei Li,
Yin Zhou,
Xinpu Zhang,
Wei Pan,
Bin Luo
Publication year - 2019
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.382276
Subject(s) - brillouin zone , optical amplifier , optics , brillouin scattering , binary golay code , amplifier , optical fiber , fiber optic sensor , time domain , erbium , materials science , physics , optoelectronics , laser , computer science , computer vision , cmos , algorithm
Firstly, Erbium-doped fiber amplifier (EDFA) served as pre-amplifier may distort Brillouin gain spectrum (BGS) in coded Brillouin optical time domain analysis sensor. Here, we found that the EDFA has negligible impact on the shape of Brillouin phase spectrum (BPS). Experimental results show that a ∼5.4 MHz Brillouin frequency shift error caused by EDFA has been avoided by using BPS instead of BGS. Secondly, after eliminating phase fluctuation caused by optical fiber, the combination of Golay coding and coherent detection has been realized.