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Optical frequency combs currently represent enabling components in a wide number of fast-growing research\udelds, from frequency metrology to precision spectroscopy, from synchronization of telecommunication systems to\udenvironmental and biomedical spectrometry. As recently demonstrated, quadratic nonlinear media are a promis-\uding platform for optical frequency combs generation, through the onset of an internally pumped optical paramet-\udric oscillator in cavity enhanced second-harmonic generation systems. We present here a proposal for quadratic\udfrequency comb generation in AlGaAs waveguide resonators. Based on the crystal symmetry properties of the\udAlGaAs material, quasi-phase matching can be realized in curved geometries (directional quasi-phase matching),\udthus ensuring ecient optical frequency conversion. We propose a novel design of AlGaAs waveguide resonators\udwith strongly reduced total losses, compatible with long-path, high-quality resonators. By means of a numerical\udstudy, we predict ecient frequency comb generation with threshold powers in the microwatt range, paving the\udway for the full integration of frequency comb synthesizers in photonic circuits

Directional quasi-phase matching AlGaAs waveguide microresonators for efficient generation of quadratic frequency combs