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Related Experiment Videos

Engineering the nonlinear phase shift with multistage autoregressive moving-average optical filters.

Yan Chen1, Geeta Pasrija, Behrouz Farhang-Boroujeny

  • 1University of Utah, Department of Electrical and Computer Engineering, Salt Lake, Utah 84112-0000, USA.

Applied Optics
|May 11, 2005
PubMed
Summary

Digital filter design optimizes optical resonant structures for enhanced nonlinear phase shifts. This approach significantly boosts nonlinearity, improving optical device performance and reducing bistability.

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Area of Science:

  • Photonics and Optical Engineering
  • Nonlinear Optics
  • Applied Physics

Background:

  • Artificial optical resonant structures are crucial for nonlinear optical applications.
  • Optimizing nonlinear phase shift response is key to improving device performance.
  • Traditional metrics like finesse or quality factor may not fully capture nonlinear behavior.

Purpose of the Study:

  • To apply digital filter design concepts to optimize artificial optical resonant structures.
  • To enhance the nonlinear phase shift response of optical filters.
  • To investigate methods for precompensating nonlinear responses and reducing optical bistabilities.

Main Methods:

  • Design and study of multistage autoregressive moving average (ARMA) optical filters using ring-resonator-based Mach-Zehnder interferometer lattices.

Related Experiment Videos

  • Utilizing filter group delay as a metric to assess nonlinear sensitivity for multiple resonances.
  • Analysis of nonlinear sensitivity enhancement with increasing group delay and filter order.

    • Main Results:

    • A four-stage ARMA filter demonstrated a nonlinearity 17 times higher than the intrinsic material for the same group delay.
    • Nonlinear sensitivity can be increased within a constant bandwidth by allocating more in-band phase or using higher-order filter structures.
    • Nonlinear sensitivity enhancement improves with increasing group delay.

    Conclusions:

    • Digital filter design offers a powerful framework for optimizing nonlinear optical resonant structures.
    • The proposed ARMA filters provide significant nonlinear sensitivity enhancement compared to intrinsic materials.
    • Methods for precompensation and understanding the impact of optical loss are crucial for practical applications.