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Calculation, characterization, and application of the time shift function in wavelength-division-multiplexed

Oleg V Sinkin1, Vladimir S Grigoryan, John Zweck

  • 1University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA. osinki1@umbc.edu

Optics Letters
|September 1, 2005
PubMed
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We developed a time shift function to rapidly assess impairments from pulse collisions in wavelength-division multiplexed systems. This function helps predict timing jitter caused by pulse interactions in optical networks.

Area of Science:

  • Optical Communications
  • Photonics
  • Signal Processing

Background:

  • Wavelength-division multiplexing (WDM) systems are crucial for high-capacity optical networks.
  • Pulse collisions in WDM systems can lead to timing jitter, degrading signal quality.
  • Dispersion management and compensation techniques are employed to mitigate impairments.

Purpose of the Study:

  • To calculate the time shift function for colliding pulses in a return-to-zero (RZ) WDM system.
  • To enable rapid determination of collision-induced timing jitter.
  • To analyze the scaling of the time shift function with pulse and channel separation.

Main Methods:

  • Developed a theoretical model to compute the time shift function.
  • Simulated pulse collisions in a WDM system with dispersion management and pre/post-compensation.

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  • Characterized the function's shape and scaling properties.

    • Main Results:

    • The time shift function was calculated for pairwise pulse collisions across different channels.
    • The function's dependence on initial pulse separation and channel separation in wavelength was determined.
    • The method allows for rapid estimation of timing jitter impairments.

    Conclusions:

    • The derived time shift function is a valuable tool for analyzing timing jitter in RZ-WDM systems.
    • Understanding the function's scaling provides insights into system design and optimization.
    • This approach facilitates the calculation of worst-case timing shifts for improved system performance.