Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Bus-waveguide-width Dependence of Evanescent Wave Coupling in a Microring Resonator

  • Son, Seong-Jin (Department of Physic and Photon Science, Gwangju Institute Science and Technology) ;
  • Kim, Suyeon (Department of Physic and Photon Science, Gwangju Institute Science and Technology) ;
  • Yu, Nan Ei (Advanced Photonics Research Institute, Gwangju Institute Science and Technology) ;
  • Ko, Do-Kyeong (Department of Physic and Photon Science, Gwangju Institute Science and Technology)
  • Received : 2021.04.28
  • Accepted : 2021.06.28
  • Published : 2021.10.25
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Abstract

The evanescent wave coupling of a microring resonator is controlled by changing the gap distance between the bus waveguide and the microring waveguide. However, the interdependence of the bus waveguide's width and the coupling is not well understood. In this paper, we investigate the dependence of coupling strength on the bus waveguide's width. The strength of the evanescent wave coupling is analytically calculated using coupled-mode theory (CMT) and numerically calculated by three-dimensional finite-difference-time-domain (FDTD) simulation. The analytic and numerical simulation results show that the phase-matching condition in evanescent wave coupling does not provide maximum coupling strength, because both phase-matching and mode confinement influence the coupling. The analytic and simulation results for the evanescent coupling correspond to the experimental results. The optimized bus-waveguide width that provides maximum coupling strength results in intrinsic quality factors of up to 1.3 × 106. This study provides reliable guidance for the design of microring resonators, depending on various applications.

Keywords

Acknowledgement

This research was supported by the "Ultra-short Quantum Beam Facility Program" and "GIST Research Institute Program" through grants provided by the Gwangju Institute of Science and Technology in 2021. This research is also supported by a National Research Foundation of Korea (NRF) grant, funded by the Korean government (No. 2021R1A2C1007130), and the Energy AI Convergence Research & Development Program through the National IT Industry Promotion Agency of Korea (NIPA), funded by the Ministry of Science and ICT (No. S1602-20-1009).

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