Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors |
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Authors: | Wan Yidun Afshar Shahraam Zou Lufan Chen Liang Bao Xiaoyi |
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Institution: | Department of Physics, University of Ottawa, Ottawa, Ontario K2P 0L2, Canada. |
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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. |
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