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Compact double-grating coupler between vertically stacked silicon-on-insulator waveguides.

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  • 1Photonic Systems Group, Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec H3A 2A7, Canada. podong@photonics.ece.mcgill.ca

Applied Optics
|December 21, 2005
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Summary
This summary is machine-generated.

This study introduces a compact double-grating coupler for silicon-on-insulator waveguides. It achieves 29% coupling efficiency, enhanced by Fabry-Perot resonance, for efficient light transfer.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Semiconductor Waveguides

Background:

  • Efficient light coupling between vertically stacked waveguides is crucial for integrated photonic circuits.
  • Traditional couplers often face challenges with size, efficiency, and fabrication complexity.
  • Silicon-on-insulator (SOI) technology offers a robust platform for advanced photonic devices.

Purpose of the Study:

  • To analyze a compact double-grating coupler for efficient light transfer between SOI waveguides.
  • To investigate the role of photonic bandgap effects and Fabry-Perot resonance in enhancing coupling efficiency.
  • To explore the potential of blazed gratings for further performance improvement.

Main Methods:

  • Design and optimization of a binary grating coupler using the eigenmode expansion (EME) method.
  • Simulation of light coupling through radiation modes between two vertically stacked SOI waveguides.
  • Verification of simulation results using the finite-difference time-domain (FDTD) method.

Main Results:

  • A compact double-grating coupler structure was analyzed, leveraging 1D photonic bandgap properties.
  • Simulations demonstrated a 29% coupling efficiency with a 12.9 micrometer long binary grating.
  • Coupling efficiency was significantly enhanced by Fabry-Perot resonance between the gratings.

Conclusions:

  • The double-grating coupler offers a promising solution for efficient light coupling in stacked SOI waveguides.
  • The use of strong gratings and Fabry-Perot resonance enables short coupling lengths and high efficiency.
  • Blazed gratings present an avenue for further optimization of coupling performance.