Pump to Stokes Waves Intensity Noise Transfer in Cascaded Brillouin Fiber Lasers

We propose a frequency model to address the relative intensity noise (RIN) transfer in cascaded Brillouin fiber lasers (CBFLs). An efficient model is derived from the multiple-wave-equation based on perturbation theory. For the sake of illustration, a third-order CBFL is analyzed. The modeling results show that RIN transfer in CBFLs has the resonant frequency associated with the fiber length and decays as the frequency increases to the order of megahertz due to the walk-off effect.