Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors.
Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors were observed for what is believed to be the first time and studied. We discovered that the Fourier spectrum of the pulsed signal and the off-resonance oscillation both contributed to subpeaks. The off-resonance oscillation at frequency /v - vB/ is the oscillation in the Brillouin time domain when beat frequency v of the two counterpropagating laser beams does not match local Brillouin frequency vB. This study is important in differentiating the subpeaks from actual strain-temperature peaks.
Wan
Yidun
Y
Department of Physics, University of Ottawa, Ottawa, Ontario K2P 0L2, Canada.
Afshar
Shahraam
S
Zou
Lufan
L
Chen
Liang
L
Bao
Xiaoyi
X