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Adiabaticity and random wave propagation.

P V Elyutin, F Ladouceur

    Optics Letters
    |August 15, 1997
    PubMed
    Summary
    This summary is machine-generated.

    Mode-coupling analysis for photonics devices is valid despite violating adiabaticity assumptions. Low spatial frequencies of roughness and inhomogeneity are the key contributors, preserving analysis integrity.

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    Area of Science:

    • Photonics
    • Waveguide theory
    • Stochastic processes

    Background:

    • Mode-coupling analysis is crucial for understanding light propagation in photonic devices.
    • Stochastic phenomena like roughness and inhomogeneity can affect device performance.
    • The assumption of adiabaticity is often used in theoretical analyses.

    Purpose of the Study:

    • To investigate the validity of the adiabaticity assumption in mode-coupling analysis.
    • To determine the impact of stochastic phenomena on photonic devices.
    • To identify the key factors contributing to analysis deviations.

    Main Methods:

    • Theoretical examination of the adiabaticity condition.
    • Analysis of mode-coupling in passive photonic devices (couplers, gratings, waveguides).

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  • Investigation of spatial frequency contributions from roughness and inhomogeneity.

    • Main Results:

    • The adiabaticity condition is formally violated by roughness and inhomogeneity.
    • Low spatial frequencies of these phenomena are the primary contributors.
    • High spatial frequencies have negligible impact on the analysis.

    Conclusions:

    • The mode-coupling analysis remains valid for stochastic phenomena in photonics.
    • Adiabatic approximations hold for the significant low spatial frequency components.
    • This finding supports the use of mode-coupling analysis in practical photonic device design.