Role of the Raman gain in the noise dynamics of all-normal dispersion silica fiber supercontinuum generation

Iván Bravo Gonzalo*, Ole Bang

*Corresponding author for this work

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Abstract

We theoretically and numerically study the influence of the Raman gain profile on the noise dynamics of the supercontinuum (SC) generation in a standard all-normal dispersion silica fiber using the scalar generalized nonlinear Schrödinger equation. In particular, we investigate the effect of the different secondary resonance gain peaks on the evolution of the SC coherence by comparing the coherence obtained when using the measured Raman gain of silica with that obtained using different analytical approximations. We demonstrate that the strongest secondary peak at 14.8 THz has a significant influence in that it leads to an early development of a decoherence band on the long wavelength side of the SC. In contrast, the decoherence is strongly dominated by the short wavelength side below the pump for all analytical models not taking this 14.8 THz gain peak into account. We demonstrate that this is due to the 14.8 THz peak being spectrally much narrower than the other gain peaks.

Original languageEnglish
JournalJournal of the Optical Society of America B: Optical Physics
Volume35
Issue number9
Pages (from-to)2102-2110
ISSN0740-3224
DOIs
Publication statusPublished - 1 Sep 2018

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