Shape-preserving and unidirectional frequency conversion using four-wave mixing Bragg scattering

TL;DR

This paper demonstrates a birefringent waveguide-based four-wave mixing Bragg scattering technique that achieves broad bandwidth, unidirectional frequency conversion, and preserves pulse shape, advancing optical signal processing capabilities.

Contribution

It introduces a novel birefringent waveguide configuration enabling unidirectional, shape-preserving frequency conversion with large bandwidth in four-wave mixing Bragg scattering.

Findings

Achieves large signal conversion bandwidth

Enables strongly unidirectional frequency conversion

Preserves pulse shape even with pulsed pumps

Abstract

In this work, we investigate the properties of four-wave mixing Bragg scattering in a configuration that employs orthogonally polarized pumps in a birefringent waveguide. This configuration enables a large signal conversion bandwidth, and allows strongly unidirectional frequency conversion as undesired Bragg-scattering processes are suppressed by waveguide birefringence. Moreover, we show that this form of four-wave mixing Bragg scattering preserves the (arbitrary) signal pulse shape, even when driven by pulsed pumps.