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    Researchers demonstrated the first 4x4 integrated reconfigurable optical unitary converter (OUC) on InP. This device enables efficient spatial mode demultiplexing and programmable photonic processing for advanced optical systems.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Optical Communications

    Background:

    • Integrated reconfigurable optical unitary converters (OUCs) are essential for mode-division-multiplexed transmission and optical neural networks.
    • Existing methods face challenges in integrating numerous Mach-Zehnder interferometer couplers on InP.

    Purpose of the Study:

    • To experimentally demonstrate a monolithically integrated 4x4 OUC on Indium Phosphide (InP).
    • To develop a scalable and manufacturable OUC for all-optical spatial mode demultiplexing and programmable photonic processing.

    Main Methods:

    • Utilized multi-plane light conversion with cascaded 4-port multimode interference couplers.
    • Optimized phase shifters for reconfigurable mode sorting and signal switching.
    • Monolithic integration on the InP platform.

    Main Results:

    • Achieved the first experimental demonstration of a 4x4 OUC integrated on InP.
    • Successfully demonstrated reconfigurable 4-mode sorting.
    • Showcased error-free switching of a 40-Gbit/s optical signal.

    Conclusions:

    • The proposed OUC design using cascaded multimode interference couplers is scalable and easier to fabricate on InP.
    • This integrated OUC is a promising component for future high-capacity optical communication systems and optical computing.