Dispersion-managed mode-locking in an all-fiber Er-doped fiber laser with OAM output based on mode superposition

We present the dispersion-managed mode-locked pulse generation in the Er-doped fiber laser in this work.The linear cavity laser scheme is implemented with an all-fiber ring serving as the total reflection mirror and a semiconductor saturable absorber mirror (SESAM) as the mode-locker and non-transparent mirror.The dispersion compensation is applied to change the net dispersion from anomalous to normal dispersion, which integrates mode-locked regimes in the -0.495-+0.197ps 2 net-cavity-dispersion range by incorporating different lengths of the dispersion compensating fiber (DCF).The noise-like mode-locked pulse and conventional soliton are observed during the net-cavity-dispersion variation process.In addition, the homemade mode-selective couplers (MSCs) are utilized to realize high-mode-purity orbital angular momentum (OAM) outputs based on the mode superposition principle.