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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Highly efficient nonlinearity reduction in silicon-on-insulator waveguides using vertical slots.

Yang Yue1, Lin Zhang, Jian Wang

  • 1Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.

Optics Express
|October 14, 2010
PubMed
Summary

Vertical slots in silicon-on-insulator waveguides significantly reduce nonlinearity by confining optical power in air. This design offers over 15x reduction in nonlinear coefficients and introduces negative dispersion, suppressing unwanted effects.

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Area of Science:

  • Photonics and optical engineering.
  • Materials science for integrated optics.

Background:

  • Nonlinearity in silicon-on-insulator (SOI) waveguides limits device performance.
  • Strip waveguides suffer from significant nonlinear effects due to high optical power confinement.

Purpose of the Study:

  • To investigate the use of vertical slots in SOI waveguides for nonlinearity reduction.
  • To analyze the optical power confinement and nonlinear coefficient in slot waveguides.
  • To evaluate the impact of negative chromatic dispersion on nonlinear parametric effects.

Main Methods:

  • Simulating optical power distribution in vertical-slot SOI waveguides.
  • Calculating the nonlinear coefficient for slot waveguides compared to strip waveguides.
  • Analyzing the chromatic dispersion properties of the designed slot waveguides.

Main Results:

  • Vertical-slot waveguides confine approximately 50% of optical power in the air-slot and air-cladding.
  • A reduction factor greater than 15 in the real part of the nonlinear coefficient is achieved at 100 nm wavelength.
  • Vertical-slot waveguides exhibit significant negative chromatic dispersion.

Conclusions:

  • Vertical slots are an effective strategy for mitigating nonlinearity in SOI waveguides.
  • The design enables substantial reduction in nonlinear effects through power delocalization and induced phase mismatch.
  • Negative chromatic dispersion further suppresses nonlinear parametric processes, enhancing device applicability.