Generation of multiple solitons in an all-fiber mode-locked Yb-Doped ring laser

摘要

We report on multiple solitons generation in an all-normal-dispersion (ANDi) passively mode-locked Yb-doped fiber ring laser with a cascaded long-period fiber grating as a spectral filter. Several different characteristic pulse modes have been experimental observed from the same ring laser by adjusting the polarization controllers, including uniform multiple solitons and nonuniform pulse-trains. In the uniform multiple solitons, the separation between the adjacent solitons is independent of the number of solitons, which is fixed at 33.6 ns. In the nonuniform pulse-train, multiple solitons up to 8 have been observed coexisting in the cavity, and the time distribution of the solitons is fixed at 21.1 ns, 12.5 ns and 8.6 ns, respectively. The observed results of multiple solitons output will not only have the potential applications in molecular detection, remote sensing and laser communication, but also be helpful to understand the mechanism of multi-solitons generation in the fiber laser system.