A fast method for Brillouin frequency shift estimation

Abstract A fast interpolation algorithm based on cross-correlation is proposed to estimate the BFS in BOTDA systems. The performances of the proposal are investigated through simulation and experiment in this paper. The simulation results demonstrate that the computational cost of the proposed algorithm is reduced to less than 1/22, 1/36, 1/2 and 1/5 of the Lorentzian fitting, upsampling cross-correlation, partial quadratic fitting and partial cross-correlation algorithm respectively. The experimental results indicate that the error of BFS extracted by our proposal is the same as that of the other schemes when no hotspot is presented and the error of BFS is smaller in cross-correlation based schemes than that in Lorentzian fitting scheme around hotspot.

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