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.
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