Self-start and stable all-fiber mode-locked laser with mode-locked filter

We report on an all-fiber pulse laser based on the combination of two mode-locked mechanisms, Nonlinear Polarization Rotation (NPR) and Single-Walled Carbon Nanotube Saturable Absorber (SWNT-SA). In this laser, the effects of the mode-locked filter bandwidth should be considered. The filter reshapes and maintains the soliton pulse in the cavity, and the laser shows better stability than only NPR used in the laser. Numerical analysis for this laser was also presented, and it corresponded experimental results well. This results shew that the combination of NPR and SWNY-SA was a practical way to stabilize the pulse fiber laser.