Theoretical Analysis of a Acoupled Fiber Ring Resonator

A fiber ring is very commonly used to generate stimulated Brillouin scatterings(SBS), especially by using fiber ring resonator. In this paper we theoretically analyzed some parameters of our interest in a coupled fiber ring resonator. We firstly analyzed a directional coupler, determined the optical power distribution among the four ports of the coupler. Then theoretically analyzed the transmission function of a coupled fiber ring resonator, followed by the simulation of the analysis. The simulation results show that the smaller the coupling coefficient is, the better the cavity finesse and extinction ration are, the lower the SBS threshold is, which is of great importance when it comes to the generation of SBS.