Analysis of spontaneous Brillouin scattering spectrum for different modulated pulse shape

Effects of different modulated pulse shapes on the backscattered Brillouin power spectra are analyzed. The investigated pulse shapes include the Lorentzian, Gaussian, hyperbolic-secant, super Gaussian, triangular, and rectangular. With the same pulse width, the Lorentzian shape has the biggest peak...

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Bibliographic Details
Published in:Optik (Stuttgart) 2013-08, Vol.124 (16), p.2417-2420
Main Authors: Hao, Yunqi, Ye, Qing, Pan, Zhengqing, Cai, Haiwen, Qu, Ronghui
Format: Article
Language:English
Subjects:
Backscattering
Brillouin optical time domain reflectometry
Brillouin zone
Gaussian
Mathematical analysis
Mathematical models
Modulated pulse shape
Peak value of Brillouin power spectrum
Power spectra
Pulse shape
Scattering
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Summary:Effects of different modulated pulse shapes on the backscattered Brillouin power spectra are analyzed. The investigated pulse shapes include the Lorentzian, Gaussian, hyperbolic-secant, super Gaussian, triangular, and rectangular. With the same pulse width, the Lorentzian shape has the biggest peak value. The peak value of Brillouin scattering spectrum decreases and tends toward stability as the order of super Gaussian function increases. The physical mechanism is characterized by the difference of launched-pulse power spectrum. Experimental research on Lorentzian, Gaussian, and rectangular pulses has been undertaken; and results are in accordant with the numerical simulations.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2012.07.005