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Mode-evolution-based TE mode magneto-optical isolator using asymmetric adiabatic tapered waveguides.

Shuyuan Liu, Yuya Shoji, Tetsuya Mizumoto

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    This study introduces a compact magneto-optical isolator for transverse electric (TE) polarized light in photonic integrated circuits. The device achieves 15 dB isolation and 5 dB insertion loss, addressing a key design challenge.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science for Integrated Devices

    Background:

    • Optical isolators are crucial for preventing back reflections in photonic integrated circuits.
    • Designing efficient transverse electric (TE) mode isolators remains a significant challenge in integrated optics.

    Purpose of the Study:

    • To present a novel magneto-optical isolator specifically for the TE polarized mode.
    • To demonstrate a compact and effective solution for optical isolation in integrated photonic devices.

    Main Methods:

    • Utilized adiabatic tapered waveguides for mode conversion.
    • Fabricated an ultranarrow device with dimensions of 1.27 μm × 1498 μm.
    • Employed magneto-optical principles for isolation functionality.

    Main Results:

    • Achieved a maximum isolation ratio of 15 dB for TE mode input.
    • Measured an insertion loss of 5 dB at a wavelength of 1537.3 nm.
    • Demonstrated functionality under TE mode operation.

    Conclusions:

    • The proposed device offers a viable solution for TE mode optical isolation in photonic integrated circuits.
    • The ultranarrow design contributes to miniaturization in photonic device fabrication.
    • The achieved performance metrics validate the effectiveness of the adiabatic tapering approach for magneto-optical isolators.