We experimentally observe soliton self-organization and pulsation in a passively mode-locked fiber laser. The optomechanical interaction in the optical fiber is key to the formation of equidistant soliton bunches. These solitons simultaneously undergo a pulsation process with a period corresponding to tens of the cavity round trip time. Using the dispersive Fourier transformation technique, we find that the Kelly sidebands in the shot-to-shot spectra appear periodically, synchronizing with the pulsation.

We report an intermediate regime between c.w. emission and noise-like pulses (NLPs) regime in an Er-doped partially mode-locked fiber laser with nonlinear polarization rotation. In this regime, the soliton bunches stochastically turn up from a quasi-cw background in the Q-switched-like envelope. The soliton bunches normally last for tens or hundreds of intracavity round-trips. When the soliton bunches vanish, typical NLPs chains are generated sporadically at location where the soliton bunches collapses. These results would be helpful to understand the generation and property of the NLPs regime.

We report on the observation of the harmonic mode-locking of bound solitons in an erbium-doped fiber laser with an Sb ₂ Te ₃ topological insulator saturable absorber (SA) on a microfiber. In the regime, there are two solitons in the bound-state pulses and the soliton separation is almost constant at different pump powers. When changing the pump power from 108 mW to 520 mW, the repetition rate of the bound-soliton mode-locking increases from 8th harmonic (105.6 MHz) to 46th harmonic (607.2 MHz). Our experiment results show that the Sb ₂ Te ₃ topological insulator SA on microfiber could be not only used as an excellent mode locker, but could also provide a highly nonlinear effect for effectively exploring the multiple pulses in the fiber lasers.

We report on a noise-like pulse (NLP) generation in a mode-locked erbium-doped all-fiber laser using a WS ₂ -deposited microfiber saturable absorber (SA). The prepared WS ₂ SA can serve as an excellent mode-locked and highly nonlinear device in the all-fiber laser cavity. At proper pump power and polarization states, typical NLPs can be generated. Adjusting the polarization also yields special NLPs with second-order harmonic mode-locking. For typical NLPs, 37 mW maximum output power and 8.8 nJ pulse energy are achieved at 334 mW pump power. The microfiber-based WS ₂ component could be a potential device for exploring nonlinear dynamics, such as NLPs.

Here, an efficient dissipative soliton mode-locked fiber laser in the L-band using nonlinear polarization rotation technology is demonstrated. With a maximum pump power of 495.3 mW and polarization state optimization, the fiber laser delivers a maximum output power of 68.6 mW with an 11.16 MHz repetition rate and corresponding single pulse energy of 6.15 nJ. The dissipative soliton spectrum is centered at 1599.6 nm with a 3 dB bandwidth of 47.8 nm. The full width at half maximum of the compressed pulse is 156 fs. To the best of our knowledge, this is the highest single pulse energy reported so far for an L-band passively mode-locked all-fiber laser.