Wavelength Scanning Speed Analysis for High-resolution Optical Spectrometry Based on Stimulated Brillouin Scattering

High-resolution optical spectrum analysis based on stimulated Brillouin scattering (SBS) has become an effective method for femtometer-level spectral measuring and monitoring The acquisition of the spectrum is realized mainly by scanning the wavelength of the pump source. However, the optical filtering of the SBS process would cause deformation on the acquired spectrum, and further restrict the scanning speed of the pump wavelength. We investigate the nonlinear coupled-wave equations for SBS effect and modify it under wavelength scanning pump condition. Furthermore, the experimental result coincides with the simulation result, which can prove the validity of the theory and the experimental method.