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Related Experiment Videos

Engineering the nonlinear phase shift.

Yan Chen1, Geeta Pasrija, Behrouz Farhang-Boroujeny

  • 1Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112-9206, USA.

Optics Letters
|November 1, 2003
PubMed
Summary

We developed a digital filter approach to enhance nonlinear phase shift sensitivity in optical systems. This method improves robustness to frequency changes and allows for greater phase shifts through precompensation.

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Area of Science:

  • Photonics
  • Nonlinear Optics
  • Optical Engineering

Background:

  • Nonlinear phase shifts are crucial for optical signal processing.
  • Existing methods for enhancing nonlinear sensitivity often face limitations in robustness and dynamic range.

Purpose of the Study:

  • To propose a novel method for enhancing nonlinear phase shift sensitivity using a digital filter approach.
  • To investigate the robustness and performance of this method under various operating conditions.

Main Methods:

  • Treating nonlinear phase shift response as a linear digital filter.
  • Synthesizing filter poles and zeros and mapping them onto an optical architecture.
  • Employing precompensation techniques for strongly driven nonlinear operation.

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Main Results:

  • Significant enhancement in nonlinear sensitivity achieved.
  • Demonstrated robustness to frequency changes within the filter passband.
  • Showed improvement in nonlinear sensitivity with increasing filter group delay and use of higher-order filters.

Conclusions:

  • The digital filter approach offers a powerful strategy for boosting nonlinear optical system sensitivity.
  • Precompensation effectively reduces distortions, enabling larger phase shifts.
  • Higher-order filters and increased group delay are key to further sensitivity improvements.