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arXiv · 2507.18058

Multicolor interband solitons in microcombs

Qing-Xin Ji·Hanfei Hou·Jinhao Ge·Yan Yu·Maodong Gao·Warren Jin·Joel Guo·Lue Wu·Peng Liu·Avi Feshali·Mario Paniccia·John Bowers·Kerry Vahala
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Abstract

In microcombs, solitons can drive non-soliton-forming modes to induce optical gain. Under specific conditions, a regenerative secondary temporal pulse coinciding in time and space with the exciting soliton pulse will form at a new spectral location. A mechanism involving Kerr-induced pulse interactions has been proposed theoretically, leading to multicolor solitons containing constituent phase-locked pulses. However, the occurrence of this phenomenon requires dispersion conditions that are not naturally satisfied in conventional optical microresonators. Here, we report the experimental observation of multicolor pulses from a single optical pump in a way that is closely related to the concept of multicolor solitons. The individual soliton pulses share the same repetition rate and could potentially be fully phase-locked. They are generated using interband coupling in a compound resonator.

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Qing-Xin Ji, Hanfei Hou, Jinhao Ge, Yan Yu, Maodong Gao, Warren Jin, Joel Guo, Lue Wu, Peng Liu, Avi Feshali, Mario Paniccia, John Bowers, Kerry Vahala. 2025-07-24. Multicolor interband solitons in microcombs. https://arxiv.org/abs/2507.18058

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