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• The generation and evolution of the asynchronous pulsating solitons in a fiber laser. • The dissipative solitons evolve asynchronously along the same and different pulsating solutions, both of which has the same pulsating period. • The asynchronous pulsating solitons evolve in a manner similar to multi-periodic pulsation, the weak pulses undergo temporal shifts during the evolution process. • The two solitons show an asynchronous pulsating operation as a whole, but the pulsation process is accompanied with explosive behavior. Pulsating behavior, as a universal phenomenon in nonlinear dissipative systems, has been widely studied due to its fascinating features. Herein, versatile categories of dual-soliton asynchronous pulsation phenomena are unveiled in net-normal dispersion mode-locked fiber laser by virtue of the dispersive Fourier transform technique. In accordance with the different oscillation behaviors, these phenomena can be divided into asynchronous pulsation following the same and different pulsating solutions, multi-periodic asynchronous pulsation and an asynchronous evolution mode with explosive behavior. It is proved that different pulsating solutions can coexist in the laser. Moreover, the energy evolution of two asynchronous pulsating solitons is almost complementary. The asynchronous pulsation is attributed to the gain-mediated soliton interactions, which make the transient gain response satisfy the dynamic equilibrium assignment. These results will promote the understanding of the complicated multi-soliton dynamics and shed reliable references for exploring the soliton asynchronous pulsation as well as the interactions of multiple pulses. [ABSTRACT FROM AUTHOR]

We demonstrate the dynamic evolution of multiple solitons (MSs) and noise-like pulse (NLP) in a passively mode-locked fiber laser using the nonlinear optical loop mirror (NOLM). The conversion from MSs to the NLP-soliton hybrid regime, as well as the conversion from the NLP-soliton hybrid regime to NLP, has been investigated with increasing the pump power. When the state converts from the MS regime to the hybrid regime, the NLP first appears as an intermittent feature of the laser emission, whose lifetime progressively increases, until it becomes permanent. While the conversion from the NLP-soliton hybrid regime to NLP is gradual. Moreover, the hybrid mode of dual-wavelength MSs and NLP is also obtained by adjusting the intra-cavity polarization and the pump power. These findings will constitute an impressive illustration of the connections and interactions between solitons and NLP from a passively mode-locked fiber laser. [ABSTRACT FROM AUTHOR]

We report on the observation of quasi-trapezoid noise-like pulses (NLPs) in a fiber laser with a large anomalous dispersion regime based on nonlinear polarization rotation. Trapezoidal NLPs operate at 1568 nm with a fundamental repetition rate of 946.14 kHz. The pulse width can widen from 12.54 to 32.17 ns, and the pulse energy can be increased from 8.81 to 25.84 nJ by increasing the pump power from 77.4 to 244.4 mW. The maximum intracavity energy of a trapezoidal pulse can reach ~258.4 nJ. Furthermore, stable high-order harmonics are obtained by regulating the pump power and polarization state. In the harmonic mode-locking regime, the second- to the tenth-order harmonic trapezoidal pulses can be achieved in the fiber laser. [ABSTRACT FROM AUTHOR]