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Soliton microcombs are helping to advance the miniaturization of a range ofcomb systems. These combs mode lock through the formation of short temporalpulses in anomalous dispersion resonators. Here, a new microcomb isdemonstrated that mode locks through the formation of pulse pairs innormal-dispersion coupled-ring resonators. Unlike conventional microcombs,pulses in this system cannot exist alone, and instead must phase lock in pairsto form a bright soliton comb. Also, the pulses can form at recurring spectralwindows and the pulses in each pair feature different optical spectra. Thispairwise mode-locking modality extends to higher dimensions and we demonstrate3-ring systems in which 3 pulses mode lock through alternating pairwise pulsecoupling. The results are demonstrated using the new CMOS-foundry platform thathas not previously produced bright solitons on account of its inherent normaldispersion. The ability to generate multi-color pulse pairs over multiple ringsis an important new feature for microcombs. It can extend the concept ofall-optical soliton buffers and memories to multiple storage rings thatmultiplex pulses with respect to soliton color and that are spatiallyaddressable. The results also suggest a new platform for the study of quantumcombs and topological photonics.

Soliton pulse pairs at multiple colors in normal dispersion microresonators