Abstract
We report on the generation of dispersion-managed dissipative soliton and various structural soliton molecules from a slight-normal dispersion fiber laser. The laser was capable of generating 56.5 nm broad dissipative solitons with quasi-rectangular spectral profile. Furthermore, the broadest top-flat spectrum with up to 71.4 nm bandwidth was achieved in the noise-like pulse regime, operating in the 1542-1613.4 nm. More importantly, by manipulating the laser cavity parameters, various types of soliton molecules, including conventional and unusual structural soliton molecules, were observed in fiber laser. The soliton molecules exhibit different features in autocorrelation traces, which are found to be related to soliton number, soliton intensity and soliton separation within the soliton molecules. The results contribute to enriching the soliton dynamics in the fiber lasers in the slight-normal dispersion regime.
Highlights
Mode-locked fiber lasers, which have the capacity for generating ultrashort pulses, have been extensively investigated owing to their potential applications in optical communication, nonlinear optics, optical sensing, and micromachining [1], [2]
We report on the generation of dispersion-managed dissipative soliton and various structural soliton molecules from a slight-normal dispersion fiber laser
The soliton molecules exhibit different features in ACs, which are found to be caused by the different peak intensities and pulse separations between pulses within the soliton molecules
Summary
Mode-locked fiber lasers, which have the capacity for generating ultrashort pulses, have been extensively investigated owing to their potential applications in optical communication, nonlinear optics, optical sensing, and micromachining [1], [2]. It is well known that the fiber laser can realize mode locking in anomalous dispersion, normal dispersion, and near-zero dispersion regimes. DMS around zero-dispersion region has drawn massive attention for the capability of generation of ultrashort pulse with broadband spectrum [14]. If the cavity dispersion is tailored properly (i.e., near zero but net-normal dispersion regime), the broadband mode-locking rectangular spectrum with several tens of nanometers would be achieved [15], [16]. Due to arranging alternately positive and negative dispersion fiber in the fiber laser, the DMSs will be periodically stretched and compressed during propagating in the laser cavity, which could result in the partial overlap of pulses [17]. It is expected that the DMSs are susceptible to the formation of soliton molecules
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