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Adiabatically tunable optical delay lines and their performance limitations.

Jacob Khurgin1

  • 1Johns Hopkins University, Baltimore, Maryland 21218, USA. jakek@jhu.edu

Optics Letters
|October 29, 2005
PubMed
Summary
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A novel tunable optical delay line using adiabatic zone folding offers improved performance at lower bit rates. However, this benefit diminishes significantly for high bit rates and large storage needs.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Optical delay lines are crucial components in optical signal processing.
  • Existing fixed delay lines lack adaptability for varying data rates.
  • Resonator-based optical buffers present opportunities for tunable delay functionalities.

Purpose of the Study:

  • To propose and analyze a simple tunable optical delay line.
  • To investigate the performance of adiabatic zone folding in coupled resonator lines for optical buffering.
  • To determine the operational limits of this tunable delay line concerning bit rates and storage capacity.

Main Methods:

  • Theoretical analysis of an optical delay line employing adiabatic zone folding in coupled resonator lines.
  • Performance evaluation across different bit rates and storage capacities.

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  • Comparison with conventional fixed delay lines.

    • Main Results:

    • The proposed tunable optical delay line demonstrates substantial performance improvements at low to medium bit rates compared to fixed delay lines.
    • The performance enhancement is contingent on the bit rate and storage capacity.
    • At high bit rates and large storage capacities, the performance advantage of the tunable design vanishes.

    Conclusions:

    • Adiabatic zone folding in coupled resonator lines offers a viable method for creating tunable optical delay lines.
    • The effectiveness of this tunable optical buffer is limited to specific operational regimes (low to medium bit rates).
    • Further research is needed to enhance performance for high-speed and high-capacity optical buffering applications.