Multipulse dynamics in a Mamyshev oscillator.

We report on the multipulse dynamics in an erbium-doped fiber Mamyshev oscillator. It was demonstrated that, in addition to the single pulse, the multipulse patterns could be observed by adjusting the pump power, where the multiple pulses operated in random distributed state or bound state. Particularly, the multiple pulses could exhibit apparent difference in intensity, which was attributed to the unique step-like saturable absorption property of the Mamyshev oscillator. The individual pulse spectrum could be assessed by utilizing dispersive Fourier transform technique. It was found that the multiple pulses with different intensities correspond to different spectral profiles. These findings give some new insights into the pulse dynamics in Mamyshev oscillators.

Pulsating soliton with chaotic behavior in a fiber laser.

We reported, to the best of our knowledge, the first experimental evidence of the pulsating soliton with chaotic behavior in an ultrafast fiber laser. By virtue of a dispersive Fourier transformation method, the chaotic behavior of soliton pulsation is visualized by the fact that the mode-locked spectrum collapses abruptly in an unpredictable way during the pulsating process. The obtained results provide the experimental demonstration of the chaotic behavior in the pulsating soliton, which would also give some new insights into the soliton pulsation dynamics in dissipative systems.