Open AccessCoherent BOTDA sensor with intensity modulated local light and IQ demodulation
Author(s) -
Zonglei Li,
Lianshan Yan,
Liyang Shao,
Wei Pan,
Bin Luo
Publication year - 2015
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.23.016407
Subject(s) - demodulation , optics , brillouin scattering , light intensity , phase modulation , brillouin zone , modulation (music) , phase (matter) , intensity (physics) , image resolution , physics , time domain , optical fiber , computer science , phase noise , telecommunications , channel (broadcasting) , acoustics , quantum mechanics , computer vision
Coherent Brillouin optical time domain analysis (BOTDA) sensing system with intensity modulated local (IML) light and fast IQ demodulation is proposed and demonstrated. IML light instead of phase modulated local (PML) light is utilized to reduce the coherent and multiple sidebands induced noises. A spatial resolution of 3-m and ± 1.8°C temperature accuracy at the far end of the fiber are obtained over 40-km sensing distance.