Gain-driven spectral-temporal noise-like pulse dynamics in a passively mode-locked fiber laser
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We study numerically complex noise-like pulse dynamics in a passively mode-locked erbium-doped fiber laser. Wavelength-dependent gain dynamics is modeled as a combination of a three-level and a four-level system, which approximate the gain behavior in the 1530-nm and 1560-nm regions, respectively. The typical deformation of the erbium gain spectrum as it saturates is properly reproduced by this approach. Several puzzling noise-like pulse dynamics that were recently observed experimentally are qualitatively reproduced numerically, in particular slow quasi-periodic energy variations and the emergence and walkoff of wavelength-shifted radiation components. These results clearly reveal that gain dynamics is deeply involved in the onset of such complex temporal and spectral instabilities in these sources. © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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Dynamics; Erbium; Fiber lasers; Passive mode locking; Erbium doped fiber laser; Four level system; Gain behavior; Passively mode-locked; Passively mode-locked fiber lasers; Pulse dynamics; Quasi-periodic; Temporal noise; Mode-locked fiber lasers
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