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Dispersion resulting from phase and amplitude errors in arrayed-waveguide grating multiplexers-demultiplexers.

H Yamada, K Okamoto, A Kaneko

    Optics Letters
    |December 8, 2007
    PubMed
    Summary
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    Phase and amplitude errors in arrayed-waveguide gratings (AWGs) cause dispersion. Low-order Fourier components of symmetric phase and antisymmetric amplitude errors are identified as the primary source of this dispersion in AWGs.

    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Arrayed-waveguide gratings (AWGs) are crucial components in wavelength-division multiplexing (WDM) systems.
    • Fabrication errors in AWGs can lead to performance degradation, including signal dispersion.
    • Understanding the impact of these errors is essential for designing high-performance optical devices.

    Purpose of the Study:

    • To investigate and quantify the dispersion introduced by phase and amplitude errors in AWG devices.
    • To identify the specific error components responsible for the observed dispersion.
    • To analyze the relationship between dispersion, fabrication errors, and the AWG's passband shape.

    Main Methods:

    • Measurement of phase and amplitude error distributions in two distinct types of AWG devices.

    Related Experiment Videos

  • Analysis of the correlation between error distributions and resulting signal dispersion.
  • Investigation of the influence of error types (symmetric phase, antisymmetric amplitude) on dispersion characteristics.

    • Main Results:

    • Dispersion in AWGs is directly linked to phase and amplitude errors.
    • Low-order Fourier components of symmetric phase errors and antisymmetric amplitude errors are the primary contributors to dispersion.
    • The passband shape of the AWG influences the extent of dispersion caused by fabrication errors.

    Conclusions:

    • Fabrication errors, specifically phase and amplitude errors, are a significant source of dispersion in AWGs.
    • Targeting low-order Fourier components of symmetric phase and antisymmetric amplitude errors during fabrication can mitigate dispersion.
    • AWG design should consider the interplay between fabrication tolerances and desired passband characteristics to minimize dispersion.