Juan Du

Multiple-soliton dynamic patterns in a graphene mode-locked fiber laser

Multiple-soliton dynamic patterns have been observed experimentally in an erbium-doped fiber ring laser with graphene as a saturable absorber. Under relatively low pumping power we have obtained disordered multiple-solitons, bunched solitons and high order harmonic mode locking by adjusting the orientation of the polarization controllers. With increased pumping power, we have also observed flow of solitons. We have experimentally investigated in detail the conditions under which these patterns form.

Observation of soliton bound states in a graphene mode locked erbium-doped fiber laser

We report on the experimental observation of bound states of solitons in a graphene mode locked erbium-doped fiber laser. By using graphene as a saturable absorber, we have obtained stable, single and bound soliton pulses, the latter with a full width at half maximum (FWHM) of 1.49 ps and a fixed pulse separation of 2.46 ps. Our results once again show that bound soliton pulses is an intrinsic feature of fiber lasers independent of the exact mode locking mechanism.

Bright-dark soliton pairs in a self-mode locking fiber laser

We have experimentally observed bright-dark soliton pairs in an erbium-doped fiber ring laser for the first time. This approach is different from the vector dark domain wall solitons which separate the two orthogonal linear polarization eigenstates of the laser emission. In our laser, the bright-dark soliton pairs can co-exist in any one polarization state. Numerical simulations based on the coupled complex Ginzburg-Landau equations have confirmed the experimental results.

Bright-dark soliton pairs emission of a fiber laser

Bright-dark soliton pairs and bright or dark solitons have all been observed by adjusting the triggering level of a digital oscilloscope in a self-mode locking erbium-doped fiber ring laser.

Experimental study of parabolic bound pulses from an Er-doped fiber ring laser

We have experimentally observed various bound states of parabolic pulses in a passively mode-locked Erbium-doped fiber ring laser. Beyond the mode-locking threshold, stable single parabolic pulse with the duration of 3.29 ps has been obtained and compressed outside the cavity to 253 fs assuming a sech2 profile. By increasing the pump power and rotating the polarization controllers, stable bound states of two parabolic pulses with a fixed separation of 6.5 ps has been obtained. Further increasing the pump power and carefully adjusting the intracavity PCs, multiple bound pulses have also been observed in the same cavity with the same pulse separation.

Passively harmonic mode-locked fiber laser with controllable repetition rate based on a carbon nanotube saturable absorber

We have proposed and demonstrated a passively harmonic mode-locked fiber laser based on a single-walled carbon nanotube saturable absorber (SWCNT-SA) that has a controllable repetition rate. With the pump power fixed, we have experimentally observed harmonically mode-locked optical pulses with repetition rates that can be controlled over the range from the fundamental to the seventh-order mode through careful adjustment of the polarization controller only. From the experimental results, we deduce that the likely origin of the self-stabilization is the result of global and local soliton interactions induced by the continuous wave (CW) components.