Robust Multimode Waveguide Design for Avoided Mode Crossing-Suppressed Microresonators

Chaochao Ye, Chanju Kim, Yi Zheng, Yueguang Zhou, Ayman N. Kamel, Yanjing Zhao, Kresten Yvind, Minhao Pu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Microresonator-based optical frequency combs enable many potential applications, from frequency metrology to optical communication. Soliton comb generation relies on dispersion control. For bright soliton generation, it is required to have anomalous group velocity dispersion. However, the avoided mode crossing in the microresonator can disturb the local dispersion and may prevent the soliton formation. Although the avoided mode crossing may enable dark soliton generation, the unintended avoided mode crossing distorts the comb spectrum. Here, we present a robust multimode waveguide design against intermodal coupling to suppress unintended avoided mode crossing. By engineering the waveguide dimension, the phase mismatch between coupling modes can be increased, which will significantly reduce the modal coupling strength. We experimentally demonstrated the avoided mode crossing-suppressed microresonators in the AlGaAs-on-insulator platform.

Original languageEnglish
JournalJournal of Lightwave Technology
Issue number14
Pages (from-to)4755-4761
Publication statusPublished - 15 Jul 2023


  • Integrated optics
  • multimode waveguides
  • nonlinear optics
  • optical resonators


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