Phase Matching for Multimode Four-Wave Mixing in Few-Mode Fibers and Nano-Rib Waveguides

TL;DR

This paper compares phase matching in four-wave mixing across different waveguide modes in few-mode fibers and nano-rib waveguides, revealing that single- and two-mode operations are optimal and four-mode mixing is generally unfeasible.

Contribution

It provides a comprehensive numerical comparison of phase matching for four-wave mixing across multiple modes in different waveguide types, highlighting the limitations of multi-mode mixing.

Findings

Four-wave mixing bandwidths are highest for one- and two-mode operation.

Four-mode four-wave mixing is not feasible in the studied waveguides.

Some nano-rib waveguides support three-mode mixing with reduced efficiency.

Abstract

We compare phase matching for four-wave mixing using one, two, three, and four waveguide modes. For the comparison, we use numerical optimizations and an estimate of the generated idler power. We present results for few-mode fibers and nano-rib waveguides and show that for both waveguide types, four-wave mixing bandwidths and idler powers are best for one- and two-mode operation and that four-mode four-wave mixing is not feasible at all. Some nano-rib waveguides support three-mode four-wave mixing, albeit with much reduced bandwidth and reduced idler power.