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Nonlinear silicon-on-insulator waveguides for all-optical signal processing.

C Koos1, L Jacome, C Poulton

  • 1Institute of High-Frequency and Quantum Electronics, University of Karlsruhe, 76131 Karlsruhe, Germany. C.Koos@ihq.uka.de

Optics Express
|June 24, 2009
PubMed
Summary

Silicon-on-insulator waveguides achieve a nonlinear parameter (gamma) up to 7 x 10^6/(W km), significantly enhancing ultrafast all-optical signal processing capabilities with compact devices.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science for Optoelectronics

Background:

  • Nonlinear optical effects in waveguides are crucial for advanced optical signal processing.
  • Existing highly nonlinear fibers offer limited performance for ultrafast applications.
  • Silicon-on-insulator (SOI) platforms present a promising avenue for enhanced nonlinearities.

Purpose of the Study:

  • To investigate the feasibility of achieving ultra-high nonlinear parameters in SOI strip and slot waveguides.
  • To provide design guidelines for maximizing the nonlinear parameter (gamma) in these structures.
  • To enable ultrafast all-optical signal processing using compact, nonresonant devices.

Main Methods:

  • Theoretical design and simulation of SOI strip and slot waveguides.
  • Analysis of waveguide structures covered with various linear and nonlinear materials.

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  • Calculation of the nonlinear parameter (gamma) at a wavelength of 1.55 micrometers.

    • Main Results:

    • Achieved nonlinear parameter values up to gamma=7 x 10^6/(W km), exceeding state-of-the-art highly nonlinear fibers by over three orders of magnitude.
    • Developed universal design curves for strip and slot waveguides, applicable to different material coatings.
    • Demonstrated the potential for compact, nonresonant devices enabling ultrafast all-optical signal processing.

    Conclusions:

    • Properly designed SOI strip and slot waveguides can achieve unprecedented nonlinear parameters.
    • These high nonlinearities are key to realizing next-generation ultrafast all-optical signal processing.
    • The provided design curves facilitate the development of advanced photonic devices.