title: Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors.
abstract: 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.
authors.affiliation: Department of Physics, University of Ottawa, Ottawa, Ontario K2P 0L2, Canada.
authors.forename: Yidun
authors.initials: Y
authors.lastname: Wan
authors.forename: Shahraam
authors.initials: S
authors.lastname: Afshar
authors.forename: Lufan
authors.initials: L
authors.lastname: Zou
authors.forename: Liang
authors.initials: L
authors.lastname: Chen
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Bao