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We report on multi-pulse dissipative solitons generation in all-normal-dispersion (ANDi) long cavity Yb-doped fiber laser with a cascaded long-period fiber grating as a spectral filter. The mode-locking is based on nonlinear polarization evolution. It was found that through either changing the pump power or adjusting wave plates in the cavity, several characteristic modes have been experimentally observed, including disordered multi-pulses, bunch of pulses with equal time intervals and non-equal time intervals. The observed results of multi-pulse output suggest a method of multi-pulse generation for potential applications in micromachining, high-resolution ranging-finding and geological exploration.

Generation of Multi-pulse Dissipative Solitons in a Mode-Locked Yb-Doped Fiber laser