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Temporal soliton switching in a rectangular nonlinear directional coupler.

A L Sala1, B G Bagley, R T Deck

  • 1Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606, USA.

Applied Optics
|March 8, 2008
PubMed
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This study explores temporal soliton switching in silica glass directional couplers. It reveals that considering two transverse dimensions significantly alters switching intensity compared to simpler models.

Area of Science:

  • Nonlinear Optics
  • Integrated Photonics
  • Materials Science

Background:

  • Temporal soliton switching is crucial for optical communications.
  • Directional couplers are key components in photonic integrated circuits.
  • Silica and doped silica glasses are standard materials for 1.55 micrometer wavelength applications.

Purpose of the Study:

  • To investigate the theory of temporal soliton switching in a planar directional coupler.
  • To account for the two transverse dimensions of rectangular channels in the analysis.
  • To compare results with traditional coupled-mode theory using a slab model.

Main Methods:

  • Formulating the optical field in the coupler using supermodes.
  • Analyzing a planar directional coupler made of silica and doped silica glass.

Related Experiment Videos

  • Considering weak channel coupling to prevent pulse breakup.

    • Main Results:

    • The switching intensity is significantly affected by the fields in the outer corner regions of the channels.
    • A two-dimensional analysis yields different switching intensities compared to a slab model.
    • Weak coupling is essential for eliminating pulse breakup in this configuration.

    Conclusions:

    • The study highlights the importance of considering full two-dimensional geometry for accurate soliton switching predictions.
    • Traditional slab models may not fully capture the switching dynamics in practical directional couplers.
    • This research provides a more refined theoretical framework for designing all-optical switching devices.