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A necessary condition for generation of bright soliton Kerr frequency combsin microresonators is to achieve anomalous group velocity dispersion (GVD) forthe resonator modes. This condition is hard to implement in visible as well asultraviolet since the majority of optical materials are characterized withlarge normal GVD in these wavelength regions. We overcome this challenge byborrowing ideas from strongly dispersive coupled systems in solid state physicsand optics. We show that photonic compound ring resonators can possess largeanomalous GVD at any desirable wavelength, even if each individual resonator ischaracterized with normal GVD. Based on this concept we design a mode lockedfrequency comb with thin-film silicon nitride compound ring resonators in thevicinity of Rubidium D1 line (794.6nm) and propose to use this optical comb asa flywheel for chip-scale optical clocks.

Enabling Arbitrary Wavelength Optical Frequency Combs on Chip