Stimulated Brillouin scattering in cascaded fibers of different Brillouin frequency shifts

Experimental investigations of stimulated Brillouin scattering in two cascaded single-mode optical fibers with different Brillouin shifts are presented. A fiber Brillouin laser consisting of these two cascaded fibers is demonstrated. The output of such a laser exhibits two frequencies corresponding to the Brillouin-shifted frequencies of two individual fibers.