Characteristics of optical fiber stimulated Brillouin scattering signal
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School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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Corresponding author:
YU Wenfeng, gdlaser@sohu.com
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Received Date:
2015-04-24
Accepted Date:
2015-05-15
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Abstract
In order to study effect of pulse width of pump light on Brillouin scattering light, three-wave coupling equations of stimulated Brillouin scattering in optical fiber sensing system were researched. The approximate expressions of scattering light were deduced based on frequency domain analysis and perturbation approximation theory. The influence of pulse width on Brillouin spectrum was analyzed through numerical calculation. The results show that a multi-peak structure of Brillouin scattering spectrum is gotten when the width is close to 20ns(phonon lifetime). When the width is more and more close to 40ns, the main peak increases and the sub-peak decreases gradually. When pulse width is far greater than phonon lifetime, scattering spectrum appears only one peak and maintains a constant peak. The study gives references for the choose of suitable pulse width in sensing.
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