Multi-wavelength Brillouin erbium fiber laser (MBEFL), which exploits SBS in the optical fiber, has be come aresearch hot spot in recent years due to the advantages of ultra-narrow linewidth [11], low threshold power [12], low noise intensity [13], and wide tunable range [14]. SBS effect results from an interaction between the intense pump light and acoustic waves in a non linear medium with a constant Brillouin frequency shift [15].