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<p>We present the design and demonstration of silicon nitride side-coupled Fabry–Pérot resonators employing both uniform and apodised distributed Bragg reflectors, for broadband dispersion engineering. By implementing air-gap Bragg gratings, we achieve a broad stopband exceeding 70&#xa0;nm. Apodised gratings enable enhanced dispersion control, allowing transitions from normal to anomalous integrated dispersion. Furthermore, high-Q resonant modes and enhanced peak reflectivity are demonstrated through co-optimisation of cavity length and waveguide-to-cavity gap. The compact footprint, the enhanced mode selectivity and the spectral bandwidth control, make side-coupled Fabry-Pérot resonators a promising platform for resonant mirrors in hybrid on-chip lasers, as well as for sensing and non-linear photonic systems.</p>

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Broadband dispersion-engineered Bragg grating mirrors for integrated side-coupled Fabry–Pérot resonators

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月18日

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  • Davide Monopoli,
  • S. Hadi Badri,
  • Nicola Maraviglia,
  • Artem S. Vorobev,
  • Natale G. Pruiti,
  • G. C. R. Devarapu,
  • Marc Sorel,
  • Giovanna Calò,
  • Liam O’Faolain

摘要

We present the design and demonstration of silicon nitride side-coupled Fabry–Pérot resonators employing both uniform and apodised distributed Bragg reflectors, for broadband dispersion engineering. By implementing air-gap Bragg gratings, we achieve a broad stopband exceeding 70 nm. Apodised gratings enable enhanced dispersion control, allowing transitions from normal to anomalous integrated dispersion. Furthermore, high-Q resonant modes and enhanced peak reflectivity are demonstrated through co-optimisation of cavity length and waveguide-to-cavity gap. The compact footprint, the enhanced mode selectivity and the spectral bandwidth control, make side-coupled Fabry-Pérot resonators a promising platform for resonant mirrors in hybrid on-chip lasers, as well as for sensing and non-linear photonic systems.