Reserch On Multi-Wavelength Brillouin Erbium Fiber Laser

The multiwavelength BEFL is the potential source for the ultra-DWDM system because of the generated multiwavelength having the rigid wavelength spacing and narrow linewidth. This thesis focuses on multi-wavelength Brillouin erbium fiber lasers.We demonstrated a tunable multiwavelength self-seeded Brillouin erbium fiber laser (BEFL) without externally Brillouin pumping. In this scheme, the stable multiwavelength comb can be produced within a ~45-nm wavelength tuning range through adjusting the polarization controllers (PCs) in a high-birefringent Sagnac loop mirror. The generation of ~200-line Stokes comb has been achieved by adjusting PCs under bidirectional pumping of two laser diodes, which is the largest wavelength number to the best of our knowledge. The effect of 980 nm pump power on the multiwavelength generation was also investigated.In this paper, we demonstrated a new architecture of self-seeded multi-wavelength Brillouin-erbium laser by using nonlinear optical loop mirror and nonlinear amplifying loop mirror (NOLM-NALM). A stable operation of 61 Brillouin Stokes lines with 0.08nm spacing was obtained and the laser exhibited satisfied flatness of the output spectrum with low threshold pump power. It is shown the four-wave-mixing (FWM) contributes to the generation of high-order Brillouin Stokes and anti-Stokes, and consequently results in the increase of Stokes'number and the reduction of its peak power.