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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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    A novel mode insensitive switch for silicon-on-insulator platforms enables efficient on-chip mode division multiplexing. This technology demonstrates low power consumption and high performance for advanced optical interconnects.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Materials Science

    Background:

    • Mode division multiplexing (MDM) is crucial for increasing optical interconnect capacity.
    • Existing mode switches often suffer from mode-dependent loss and crosstalk.
    • Silicon-on-insulator (SOI) is a leading platform for integrated photonic devices.

    Purpose of the Study:

    • To propose and demonstrate a mode insensitive switch for on-chip MDM.
    • To achieve low power consumption and high performance in optical switching.
    • To validate the switch's functionality for high-speed data transmission.

    Main Methods:

    • Design and fabrication of a balanced Mach-Zehnder interferometer with a mode insensitive phase shifter on an SOI platform.
    • Experimental characterization of insertion loss, crosstalk, and extinction ratios for multiple transverse electric (TE) modes (TE0, TE1, TE2).
    • High-speed data transmission tests using non-return-to-zero pseudorandom binary sequence (PRBS)-31 signals at 10 Gb/s.

    Main Results:

    • Successful switching of the first three quasi-transverse electric (TE) modes with low power consumption (< 40 mW).
    • Achieved insertion losses of -2, -3.7, and -5.2 dB for TE0, TE1, and TE2 modes, respectively.
    • Demonstrated crosstalk below -8.6 dB and extinction ratios exceeding 15.4 dB for all modes, with open eye diagrams for 10 Gb/s data transmission.

    Conclusions:

    • The proposed mode insensitive switch effectively enables on-chip MDM interconnects.
    • The device exhibits excellent performance metrics, including low loss, low crosstalk, and high extinction ratios.
    • The demonstrated high-speed data transmission capability confirms its suitability for future optical communication systems.