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Slow-light dispersion in periodically patterned silicon microring resonators.

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  • 1Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, USA. yilee@ece.rochester.edu

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We developed a novel silicon ring resonator coupled to a waveguide for optical communication. This device achieves a high extinction ratio and slow light, enabling compact wavelength-division multiplexing systems.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Materials Science

Background:

  • Silicon-on-insulator (SOI) platform is a key technology for integrated photonics.
  • Ring resonators offer compact solutions for optical signal processing.
  • Efficient coupling between waveguides and resonators is crucial for device performance.

Purpose of the Study:

  • To demonstrate a novel periodically patterned ring resonator evanescently coupled with a coupler waveguide (CWG).
  • To optimize coupling by phase matching the ring resonator and CWG.
  • To explore applications in compact device integration for wavelength-division multiplexing (WDM) systems.

Main Methods:

  • Fabrication of a periodically patterned ring resonator on an SOI platform.
  • Evanescent coupling of the ring resonator with a CWG.
  • Tuning the CWG width for phase matching.
  • Analysis of transmission spectra and mode profiles.

Main Results:

  • Achieved a high extinction ratio of over 20 dB.
  • Demonstrated a group index of approximately 20 in the slow-light regime.
  • Observed beating patterns in mode profiles indicating strong interference between degenerate modes.

Conclusions:

  • The developed device enables efficient light manipulation in a compact form factor.
  • Potential for integration into WDM systems, reducing four-wave mixing crosstalk.
  • Opens possibilities for novel photonic integrated circuits.