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    Area of Science:

    • Optics and Photonics
    • Optical Communications

    Background:

    • Current optical communication systems face limitations in efficiently managing and reconfiguring spatial modes within light beams.
    • The need for hitless reconfiguration in optical add-drop multiplexers is critical to avoid service interruptions during network changes.

    Purpose of the Study:

    • To demonstrate a novel method for extracting individual spatial modes from a light beam.
    • To develop a self-aligning technique that minimizes fundamental splitting losses.
    • To present a spatial reconfigurable optical add-drop multiplexer (ROADM) with hitless reconfiguration capabilities.

    Main Methods:

    • Utilizing local feedback loops on controllable beam splitters and phase shifters.
    • Implementing the method with Mach-Zehnder interferometers in planar optics.
    • Extending the technique for simultaneous extraction of multiple spatial modes.

    Main Results:

    • Successfully extracted a single spatial mode from a light beam while leaving orthogonal modes undisturbed.
    • Achieved self-alignment and avoided fundamental splitting losses.
    • Demonstrated the capability for multiple simultaneous mode extractions.

    Conclusions:

    • The proposed method provides an efficient and loss-minimizing approach for spatial mode extraction and manipulation.
    • The developed technique enables hitless reconfiguration for spatial ROADMs, crucial for uninterrupted optical network operations.
    • This technology has the potential to significantly advance optical communication systems by improving signal management and network flexibility.