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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Colorless directional coupler with dispersion engineered sub-wavelength structure.

R Halir1, A Maese-Novo, A Ortega-Moñux

  • 1Departamento Ingeniería de Comunicaciones, ETSI Telecomunicación, Universidad de Málaga, 29010 Málaga, Spain. robert.halir@ic.uma.es

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Summary

This study enhances silicon-on-insulator directional coupler bandwidth fivefold using sub-wavelength gratings. The novel approach broadens operational wavelength range without affecting device size or phase response.

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Area of Science:

  • Integrated Optics
  • Nanophotonics
  • Waveguide Devices

Background:

  • Directional couplers are fundamental components in integrated optics.
  • Existing directional couplers have a limited operational wavelength range, hindering broader applications.
  • Sub-wavelength gratings offer unique dispersive properties for optical manipulation.

Purpose of the Study:

  • To enhance the operational bandwidth of silicon-on-insulator (SOI) directional couplers.
  • To leverage the dispersive properties of sub-wavelength gratings for improved performance.
  • To maintain device size and phase response while increasing bandwidth.

Main Methods:

  • Utilizing sub-wavelength gratings integrated into a directional coupler design.
  • Employing silicon-on-insulator (SOI) as the material platform.
  • Conducting full 3D Finite-Difference Time-Domain (FDTD) simulations to validate performance.

Main Results:

  • Achieved a fivefold enhancement in the operational bandwidth of the directional coupler.
  • Demonstrated a 100 nm operational bandwidth for the proposed device.
  • Maintained a low imbalance (≤ 0.6 dB) between the device outputs across the operational bandwidth.

Conclusions:

  • Sub-wavelength gratings effectively enhance the operational bandwidth of SOI directional couplers.
  • The proposed method provides a significant bandwidth improvement without compromising device size or phase response.
  • This advancement opens possibilities for broader applications of directional couplers in integrated optics.