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Related Experiment Video

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Odd excitation of symmetric multimode interference structures.

Salwa El-Sabban, Diaa Khalil

    Applied Optics
    |June 4, 2019
    PubMed
    Summary

    Researchers developed a formula for odd excitation in symmetric multimode interference (MMI) optical structures. This model accurately predicts imaging length and enables the design of devices like power splitters.

    Area of Science:

    • Integrated Optics
    • Photonics
    • Waveguide Theory

    Background:

    • Multimode interference (MMI) devices are key components in integrated photonics.
    • Understanding excitation modes is crucial for device performance.
    • Symmetric MMI structures offer unique properties due to their inherent symmetry.

    Purpose of the Study:

    • To investigate the odd excitation behavior in symmetric MMI structures.
    • To derive a simplified analytical formula for imaging length under odd excitation.
    • To validate the formula and explore its application in device design.

    Main Methods:

    • Analytical modeling utilizing the symmetry properties of MMI structures.
    • Numerical verification using the Beam Propagation Method (BPM).

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  • Application of the model to both two-dimensional (2D) and three-dimensional (3D) MMI designs.

    • Main Results:

    • A simple, accurate formula for imaging length under odd excitation was successfully derived.
    • Analytical results were confirmed through rigorous BPM numerical simulations.
    • The model demonstrated applicability to both 2D and 3D MMI structures.

    Conclusions:

    • The developed formula provides a valuable tool for analyzing and designing MMI-based photonic devices.
    • The model facilitates the creation of functional devices like power splitters and mode converters for asymmetric modes.
    • This work enhances the understanding and application of odd excitation in symmetric MMI waveguides.