Multiple Dissipative Solitons in a Long-Cavity Normal-Dispersion Mode-Locked Yb-Doped Fiber Laser

Transitional operations of multiple dissipative solitons in a long-cavity normal-dispersion Yb-doped fiber laser are experimentally investigated. Multiple dissipative solitons, including a stable soliton pair and a soliton triplet are observed by increasing the pump power or adjusting the polarization controllers. Two main boundaries of the stable asymmetric soliton and oscillating soliton are found between steady mode-locking. Moreover, multiple dissipative solitons with greater quantities of solitons are observed with pump power increasing. The experimental results agree well with a previous numerical study of multiple dissipative solitons.