Modeling and design of waveguide-coupled single-mode micro-ring resonators

M. K. Chin*, Seng-Tiong Ho

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


We discuss a first-order design tool for waveguide-coupled microring resonators based on an approximate solution of the wave propagation in a microring waveguide with micron-size radius of curvature and a large lateral index contrast. The model makes use of the conformal transformation method and a linear approximation of the refractive index profile, and takes into account the effect of waveguide thickness, dispersion, and diffraction. Based on this model, we develop general design rules for the major physical characteristics of a waveguide-coupled microring resonator, including the resonance wavelength, the free spectral range, the coupling ratio, the bending radiation loss and the substrate leakage loss. In addition, the physical model provides insights into alternative coupling designs that significantly increase the coupling length and reduce or eliminate the dependence on a narrow air gap in the waveguide-coupled microring resonator. We present two examples, one using a phase-matching parallel waveguide with a smaller width than the ring waveguide, and the other using a vertical coupling structure.

Original languageEnglish (US)
Pages (from-to)36-48
Number of pages13
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 1998
EventProceedings of the 1998 Conference on Integrated Optoelectronics II - Beijing, China
Duration: Sep 18 1998Sep 19 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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