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    Area of Science:

    • Photonics
    • Optics
    • Materials Science

    Background:

    • Optical isolators are crucial for preventing back reflections in photonic systems.
    • Existing analysis often relies on coupled mode theory, which may not capture all operational aspects.

    Purpose of the Study:

    • To investigate optical isolator performance beyond coupled mode analysis.
    • To identify and mitigate factors degrading device performance in magneto-optic waveguide arrays.

    Main Methods:

    • Semi-vectorial beam propagation simulations were employed to analyze device operation.
    • Coupled mode theory was used to assess system robustness against fabrication tolerances.

    Main Results:

    • Evanescent tail coupling and radiation effects were identified as key performance degraders.
    • Increased array size and the introduction of radiation blockers significantly improved isolator performance.
    • The system demonstrated robustness to fabrication tolerances, with variations averaging out in larger arrays.

    Conclusions:

    • Advanced simulation methods reveal critical performance limitations in optical isolators.
    • Strategies like array scaling and radiation blockers offer effective solutions for enhancing device performance.
    • The findings contribute to the design of more reliable and efficient optical isolator devices.