All-Fiber Mode-Locked Laser Based on Mamyshev Mechanism With High-Energy Pulse Generation at 1550 nm

An all-fiber mode-locked laser based on Mamyshev mechanism operating at 1550 nm is demonstrated. Self-phase modulation and offset spectral filtering provide high peak-power pulse selection in the laser cavity and induce mode locking. With selected operating parameters, the all-fiber mode-locked laser easily achieves mode locking without external seed pulses or auxiliary starting arms, making the laser convenient to operate. Pulses with maximum energy ~18 nJ and width 230 fs are obtained. Pulse width is almost unchanged with increasing pump power, while pulse energy increases linearly. Starting of the mode-locked laser based on Mamyshev mechanism and output spectra with different pump powers are experimentally investigated.