研究目的
To demonstrate the existence of the high-order soliton (HOS) as well as its dynamics in all-anomalous-dispersion (AANDi) fiber lasers for the first time and to understand the soliton shaping dynamics and instability in anomalous-dispersion fiber lasers.
研究成果
The study demonstrates that solitons in anomalous-dispersion fiber lasers deviate from the quasi-stationary fundamental soliton at high pulse energy, leading to chaotic switching between single- and dual-pulse states or stable soliton molecule generation. This research provides insights into the HOS dynamics in dissipative systems and the stability limitations of ultrafast lasers.
研究不足
The study is based on numerical simulations, and experimental validation is needed to confirm the findings. The research focuses on anomalous-dispersion fiber lasers, and the applicability to other types of fiber lasers is not explored.
1：Experimental Design and Method Selection
The study uses numerical simulation to explore the dynamics of high-order solitons in fiber lasers. The complex Ginzburg-Landau equation (CGLE) is employed to describe the pulse propagating in the laser cavity.
2：Sample Selection and Data Sources
The simulation model includes a cavity with 1m Er-doped fiber (EDF), a piece of single-mode fiber (SMF), a 10:90 output coupler (OC), and a saturable absorber (SA).
3：List of Experimental Equipment and Materials
The equipment includes EDF, SMF, OC, and SA. The parameters for the simulation are specified, including group-velocity dispersion, nonlinearity of the fiber, gain bandwidth, and modulation depth of the SA.
4：Experimental Procedures and Operational Workflow
The simulation runs from the EDF to the SMF in each round. The symmetric split-step Fourier method is used for simulations, running for at least 100000 roundtrips (RTs) for each case.
5：Data Analysis Methods
The soliton-order and FWHM evolution across the cavity are calculated to understand the intra-cavity dynamics. The soliton-order is calculated based on the Kerr nonlinearity of the fiber, peak power of the pulse, FWHM of the pulse, and dispersion of fiber at the current position.
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