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16 November 2004 Simulation of the distributed fiber optic pump-probe Brillouin sensor
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Abstract
We solved the three coupled partial differential equations in transient regime for the probe-pump Brillouin sensor to explain the sub-peaks in Brillouin loss spectra, which have been experimentally observed. We discovered that the Fourier spectrum of the pulsed signal and the off-resonance oscillation attributed to sub-peaks. The off-resonance oscillation at frequency [v - vB] is the oscillation in the Brillouin time domain when the beat frequency v of the two counter-propagating laser beams does not match the local Brillouin frequency vB. This is important in differentiating the sub-peaks from strain/temperature peaks.
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Yidun Wan, Sharhraam Vahid Afshar, Lufan Zou, Liang Chen, and Xiaoyi Bao "Simulation of the distributed fiber optic pump-probe Brillouin sensor", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); https://doi.org/10.1117/12.567410
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