Suppression and splitting of modulational instability sidebands in periodically tapered optical fibers due to fourth-order dispersion

TL;DR

This paper investigates how periodic tapering in optical fibers influences modulational instability, revealing suppression and splitting of sidebands through the interplay of parametric resonance and fourth-order dispersion effects.

Contribution

It demonstrates that periodic tapering can suppress and control MI sidebands, introducing new unstable regions due to phase mismatch effects.

Findings

Suppression of MI sidebands by dispersion oscillations

Splitting of instability peaks due to parametric resonance

Identification of isolated unstable regions in parameter space

Abstract

We study the modulational instability induced by periodic variations of group-velocity dispersion in the proximity of the zero dispersion point. Multiple instability peaks originating from parametric resonance coexist with the conventional modulation instability due to fourth order dispersion, which in turn is suppressed by the oscillations of dispersion. Moreover isolated unstable regions appear in the space of parameters due to imperfect phase matching. This confirms the dramatic effect of periodic tapering in the control and shaping of MI sidebands in optical fibers.