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arXiv · 2610.41315

Dual-rate optical frequency comb based on a cylindrical microresonator with a nanoscale radius variation

Alena Kolesnikova·Andrey Gelash·Ilya Vatnik
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Abstract

We theoretically find that a cylindrical microresonator with nanoscale radius variation can be a source of coherent microcombs with two repetition rates, independently controlled by the device geometry. This phenomenon arises from the formation of two-dimensional axial-azimuthal dissipative Kerr solitons (2D DKS), which we discovered through numerical simulations of the nonlinearly coupled Lugiato-Lefever equations with realistic microresonator device parameters. We demonstrate that, despite the variation in the dispersion characteristics of azimuthal modes at different axial numbers, the spontaneous synchronization mechanism leads to a unified soliton repetition rate. We consider near-parabolic variations in the radius of a cylindrical resonator, compatible with the surface nanoscale axial photonics (SNAP) platform. In our example, we generate 2D DKS with an azimuthal rate of approximately 329 GHz and an axial rate of 6 GHz, which can be adjusted on demand by selecting the appropriate resonator geometry, thereby promising compact sources of frequency combs operating simultaneously across different frequency scales.

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Alena Kolesnikova, Andrey Gelash, Ilya Vatnik. 2026-10-30. Dual-rate optical frequency comb based on a cylindrical microresonator with a nanoscale radius variation. https://arxiv.org/abs/2610.41315

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