Fig. 1: Waveguide design and dispersion engineering.
From: Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators

a Schematic drawing of the AlGaAsOI waveguide cross section; b simulated intensity distribution of the waveguide fundamental TE mode for comb generation; c simulated GVD of 400-nm-thick AlGaAsOI waveguides with different widths.