Abstract
In many practical problems dealing with optical amplification a frequency dependence of the gain (that usually is broader compared to the considered signal bandwidth) is assumed to be symmetric and is approximated by the Lorentzian spectral shape [3] a new type of asymmetric nonlinear pulse propagation was demonstrated distinguished by the presence of a dynamically-evolving gain spectrum. The dynamic change of the gain and spectral broadening led to quasi-stable regimes where pulse was partially propagating at the edge of the material gain curve. We anticipate that our analysis of much more simple model might provide useful insight into characteristics of nonlinear pulse propagation in a medium with spectrally asymmetric amplification, beyond standard parabolic gain curve approximations.
© 2023 IEEE
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