Abstract
We observe a strong self-pulsing phenomenon in an all-fiber Er-doped ring laser. With an increase in the pump power, the generated pulse gradually evolves from a sine-wave pulse to a typical mode-locking pulse train. The self-mode-locked laser pulse obtained has a pulse-repetition rate in the megahertz region and a maximum average output power of around 1 mW. The self-pulsing evolving dynamics can be analyzed using coupled-wave rate equations by simultaneously considering the interaction of two adjacent Er-ions and the reabsorption loss of the ground-state energy levels.
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