33-channels multiwavelength generation of L-band Brillouin-erbium fiber laser

In this paper, a novel multiwavelength Brillouin-erbium fiber laser (BEFL) with double-pass BP pre-amplified technique within the linear cavity is experimentally demonstrated. The linear cavity of the laser system is formed by two high reflectivity mirrors placed at both ends of the resonator. The main innovative step in this approach is the use of the erbium-doped fiber amplifier (EDFA) to amplify the Brillouin pump (BP) power twice within the laser cavity before entering the single-mode fiber. Therefore, the proposed fiber laser eliminates the requirement for high external BP power to create the Brillouin gain and suppress the self-lasing cavity modes.