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Subwavelength grating crossings for silicon wire waveguides.

Przemek J Bock1, Pavel Cheben, Jens H Schmid

  • 1Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Canada. przemek.bock@nrc.ca

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We developed a novel silicon waveguide crossing using subwavelength gratings. This design significantly reduces signal loss, polarization dependence, and crosstalk for improved optical performance.

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Area of Science:

  • Photonics and Optical Engineering
  • Nanophotonics
  • Integrated Optics

Background:

  • Waveguide crossings are essential components in integrated photonic circuits.
  • Minimizing loss, crosstalk, and polarization dependence in crossings is critical for device performance.
  • Existing waveguide crossing designs often face limitations in achieving ultra-low loss and crosstalk.

Purpose of the Study:

  • To design, simulate, and experimentally demonstrate a new type of waveguide crossing.
  • To utilize subwavelength gratings in silicon waveguides for enhanced performance.
  • To achieve minimal signal loss, crosstalk, and polarization dependence.

Main Methods:

  • Employing 3D finite-difference time-domain (FDTD) simulations for design optimization.
  • Fabricating the proposed waveguide crossing devices in silicon-on-insulator (SOI) technology.
  • Conducting experimental measurements to validate simulation results and quantify device performance.

Main Results:

  • Achieved an ultra-low insertion loss as low as -0.023 dB per crossing.
  • Demonstrated minimal polarization dependent loss (PDL) of less than 0.02 dB.
  • Attained significantly low crosstalk levels below -40 dB.

Conclusions:

  • The developed subwavelength grating waveguide crossing offers superior performance compared to existing technologies.
  • This new design is highly suitable for advanced integrated photonic applications requiring high density and low loss.
  • The experimental validation confirms the effectiveness of subwavelength gratings for high-performance photonic interconnects.