Self-starting of Mamyshev oscillator using an optical beam shutter

A simple method to self-start a Mamyshev oscillator (MO) using an optical beam shutter (OBS) in the cavity is presented. OBS is placed inside the cavity to introduce a strong optical fluctuation by switching its state (open/close). Stable mode-locking operation is achieved in fiber MO by using an OBS without requiring any external mode-locked seed source or pump modulation.