Diffusion effect of stimulated Raman scattering and synchronous conversion of optical signal

Diffusion effect of stimulated Raman scattering and synchronous conversion of optical signal are investigated. Taking into account the spatial diffusion effects of light fields, the coupled-wave equation of stimulated Raman scattering is modified firstly. Optical signal synchronous conversion has been completed using modified coupled-wave equations of stimulated Raman scattering. The threshold value of the coupling strength in which the optical signal realizes the synchronous conversion is determined through calculating the maximum Lyapunov exponent of the coupled system.