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Related Experiment Video

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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
09:36

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Published on: March 19, 2016

Numerically-assisted coupled-mode theory for silicon waveguide couplers and arrayed waveguides.

Michael L Cooper1, Shayan Mookherjea

  • 1University of California, San Diego, La Jolla, California 92093, USA. mlcooper@ucsd.edu

Optics Express
|February 4, 2009
PubMed
Summary
This summary is machine-generated.

We developed a method to reconstruct coupling matrices for silicon-on-insulator waveguide couplers. Next-to-nearest-neighbor coupling is significant at small separations, impacting waveguide design.

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Area of Science:

  • Photonics and Waveguide Engineering
  • Computational Electromagnetics

Background:

  • Coupled-mode theory is crucial for designing photonic devices like waveguide couplers.
  • Silicon-on-insulator (SOI) technology offers high refractive index contrast for compact photonic integrated circuits.

Purpose of the Study:

  • To develop a method for reconstructing coupling matrices from modal profiles in SOI waveguide couplers.
  • To analyze the significance of next-to-nearest-neighbor coupling in arrayed waveguides at small separations.

Main Methods:

  • Utilizing coupled-mode theory for waveguide coupler design.
  • Applying finite-difference frequency-domain (FDFD) calculations to obtain modal profiles.
  • Solving the inverse problem to reconstruct the coupling matrix from modal data.

Main Results:

  • Supermode theory offers a good approximation for mode profiles.
  • Next-to-nearest-neighbor coupling becomes significant at small waveguide separations.
  • Quantified critical separation distances for three different SOI platforms.
  • Observed field skewing and deformation at small separations.

Conclusions:

  • Accurate design of SOI waveguide couplers requires considering next-to-nearest-neighbor coupling.
  • The developed inverse problem solution aids in precise photonic device design.
  • Understanding field distortions is vital for optimizing performance in densely packed waveguide arrays.