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Multi-order dispersion engineering for optimal four-wave mixing.

Michael R Lamont1, Boris T Kuhlmey, C Martijn de Sterke

  • 1Centre for Ultra-high-bandwidth Devices for Optical Systems School of Physics, University of Sydney, Sydney, NSW 2006, Australia. m.lamont@physics.usyd.edu.au

Optics Express
|June 12, 2008
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Summary
This summary is machine-generated.

High refractive index materials enable efficient four-wave mixing. A new dispersion engineering method overcomes bandwidth limitations caused by negative quartic dispersion, doubling the four-wave mixing bandwidth.

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Area of Science:

  • Nonlinear Optics
  • Materials Science
  • Optical Engineering

Background:

  • High refractive index materials offer large cubic nonlinearity for efficient four-wave mixing (FWM).
  • Normal material dispersion at telecom wavelengths hinders phase-matched FWM.
  • Waveguide dispersion engineering can induce anomalous dispersion but often leads to limited FWM bandwidth due to negative quartic dispersion.

Purpose of the Study:

  • To investigate the origin of negative quartic dispersion in engineered anomalous dispersion waveguides.
  • To develop a modified dispersion engineering technique for enhanced FWM bandwidth.
  • To demonstrate a significant increase in FWM bandwidth through optimized dispersion engineering.

Main Methods:

  • Theoretical analysis of dispersion relations in strongly confining waveguides.
  • Numerical simulations of four-wave mixing processes.
  • Fabrication and characterization of optical waveguides with engineered dispersion properties.

Main Results:

  • Negative quartic dispersion is an inherent outcome of the standard dispersion engineering approach.
  • A modified dispersion engineering procedure was identified, leading to positive quartic dispersion.
  • The modified procedure resulted in a doubled four-wave mixing bandwidth in a specific example.

Conclusions:

  • The limitations imposed by negative quartic dispersion can be overcome through careful dispersion engineering.
  • Achieving positive quartic dispersion is crucial for maximizing FWM bandwidth in such systems.
  • This work presents a viable pathway to significantly enhance FWM performance in high nonlinear materials.