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Soliton supermode transitions and total red shift suppression in multi-core fibers

A. Antikainen and G. P. Agrawal

Abstract

Soliton propagation in seven-core fibers is studied numerically with the frequency dependence of linear coupling taken into account. It is shown that under certain conditions, solitons can undergo spontaneous supermode transitions upon abrupt red shift, analogous to the recently discovered phenomenon of soliton self-mode conversion in step-index multi-mode fibers. When the core separation is increased, the dynamics change drastically, leading to total suppression of soliton self-frequency shift and the emergence of spatially oscillating solitonic structures with resemblance to solitons in graded-index multi-mode fibers. The observed phenomena are general multi-core effects and not specific to seven-core fibers.

© 2019 Optical Society of America

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Supplementary Material (2)

NameDescription
Visualization 1       The spectrogram at various propagation distances in a seven core fiber where the core separation is 16 µm. The sech-shaped input pulse is launched in the center core, has a duration (FWHM) of 100 fs, and a peak power of 10 kW.
Visualization 2       The spectrogram at various propagation distances in a seven core fiber where the core separation is 25 µm. The sech-shaped input pulse is launched in the center core, has a duration (FWHM) of 100 fs, and a peak power of 10 kW.

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