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Updated: May 27, 2026
High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Accurate estimation of Brillouin frequency shift in Brillouin optical time domain analysis sensors using cross
Mohsen Amiri Farahani1, Eduardo Castillo-Guerra, Bruce G Colpitts
1Department of Electrical and Computer Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. mohsen.amiri@unb.ca
Abstract:
Current methods of estimating the Brillouin frequency shift in Brillouin optical time domain analysis sensors are based on curve-fitting techniques. These techniques apply the same weight to all portions of the curve and dutifully fit into the peak and noisy ends of the curve. This makes them very sensitive to noise, initialization of fitting parameters, symmetry, and start and stop frequencies. We introduce a method based on the cross-correlation technique to estimate the central frequency of noisy Lorentzian curves, which is more robust to noise and free from initial settings of fitting parameters.
