Iterative method for Brillouin fiber ring resonator

The interest for Brillouin fiber ring lasers has significantly increased due to the large spectrum of their applications. At the same time, their application is limited because of the important peak-power fluctuations which are mainly due to the stochastic nature of the spontaneous Brillouin scattering that initiates the stimulated Brillouin scattering (SBS). Therefore, it is of great interest to develop new models and methods for controlling these amplitude fluctuations. This paper shows that, in dynamical regime, experimental and simulation results for the transmitted pump and Stokes waves from the ring resonator are concordant for the same conditions. A hyperbolic secant periodic modulation signal is applied on the ring cavity formed by a directional fiber coupler and by L = 2 m of SM optical fiber. For each period of the incident signal, one pulse is emitted by SBS inside the ring resonator. For the both situations, experimental and simulation, a small depletion in the transmitted pump that corresponds in the SBS signal emission is observed. This pulse with Gaussian shape presents a FWHM of about 1 μs and its repetition period is 200μs, which is in agreement with the repetition period of the pumping signal.