Brillouin Scattering Spectrum Analysis Based on Auto-Regressive Spectral Estimation

Abstract

Abstract Auto-regressive (AR) spectral estimation technology is proposed to analyze the Brillouin scattering spectrum in Brillouin optical time-domain refelectometry. It shows that AR based method can reliably estimate the Brillouin frequency shift with an accuracy much better than fast Fourier transform (FFT) based methods provided the data length is not too short. It enables about 3 times improvement over FFT at a moderate spatial resolution.

Keywords

• Brillouin optical time-domain reflectometry (BOTDR)
• auto-regressive (AR) model
• spectral estimation
• distributed fiber-optic sensing