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13 October 2008 Application of Levenberg-Marquardt algorithm in the Brillouin spectrum fitting
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Abstract
Brillouin distributed optical fiber sensing system based on spontaneous Brillouin scattering frequency shift measurement may measure temperature in the optical fiber, due to the dependence of spontaneous Brillouin scattering frequency shift on temperature. In this paper, nonlinear theoretical models of the Brillouin spectrum in the BOTDR temperature sensing system are analyzed. The model parameters are optimized with Levenberg-Marquardt algorithm. By numerical calculation, it is indicated that pseudo-Voigt function can approach approximated the Voigt profile well and quickly.
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Chuankai Zhang, Yuanhong Yang, and Anqi Li "Application of Levenberg-Marquardt algorithm in the Brillouin spectrum fitting", Proc. SPIE 7129, Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration, 71291Y (13 October 2008); https://doi.org/10.1117/12.807646
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