Journal article ยท Preprint article
Directional supercontinuum generation: The role of the Soliton
In this paper we numerically study supercontinuum generation by pumping a silicon nitride waveguide, with two zero-dispersion wavelengths, with femtosecond pulses. The waveguide dispersion is designed so that the pump pulse is in the normal-dispersion regime. We show that because of self-phase modulation, the initial pulse broadens into the anomalous-dispersion regime, which is sandwiched between the two normal-dispersion regimes, and here a soliton is formed.
The interaction of the soliton and the broadened pulse in the normal-dispersion regime causes additional spectral broadening through formation of dispersive waves by non-degenerate four-wave mixing and cross-phase modulation. This broadening occurs mainly towards the second normal-dispersion regime.
We show that pumping in either normal-dispersion regime allows broadening towards the other normal-dispersion regime. This ability to steer the continuum extension towards the direction of the other normal-dispersion regime beyond the sandwiched anomalous-dispersion regime underlies the directional supercontinuum notation.
We numerically confirm the approach in a standard silica microstructured fiber geometry with two zero-dispersion wavelengths.
Language: | English |
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Year: | 2019 |
Pages: | A131 |
ISSN: | 15208540 and 07403224 |
Types: | Journal article and Preprint article |
DOI: | 10.1364/JOSAB.36.00A131 |
ORCIDs: | Rao, Shreesha D.S. , Bang, Ole , Bache, Morten and 0000-0002-0139-1141 |