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Photonics-based multi-function analog signal processor based on a polarization division multiplexing Mach-Zehnder

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    A novel photonic signal processor enables simultaneous microwave phase shifting, upconversion/downconversion, and filtering. This versatile optical device offers tunable control across a wide bandwidth for advanced signal processing applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Analog Signal Processing
    • Microwave Engineering

    Background:

    • Advanced analog signal processing is crucial for modern communication systems.
    • Existing photonic processors often lack multi-functionality and tunability.
    • Optical polarization division multiplexing offers a pathway to complex signal manipulation.

    Purpose of the Study:

    • To propose and demonstrate a novel photonics-based multi-function analog signal processor.
    • To achieve simultaneous photonic microwave phase shifting, upconversion/downconversion, and filtering.
    • To showcase the processor's tunability and potential applications.

    Main Methods:

    • Utilizing an optical polarization division multiplexing dual-parallel Mach-Zehnder modulator.
    • Implementing photonic microwave phase shifting with continuous phase tuning from -180 to 180 degrees.
    • Demonstrating frequency-mixed phase shifters and a four-tap microwave photonic filter.

    Main Results:

    • Simultaneous photonic microwave phase shifting, upconversion/downconversion, and filtering were successfully demonstrated.
    • Tunable phase shifters operated from 0-11 GHz (downconverted) and 11-33 GHz (upconverted).
    • A four-tap microwave photonic filter capable of selecting frequency-mixed components was constructed.

    Conclusions:

    • The proposed photonics-based processor offers multi-functionality, scalable channels, wide bandwidth, and high tunability.
    • This technology is suitable for applications in beamforming networks, radio frequency frontends, and radio over fiber systems.
    • The demonstrated device represents a significant advancement in analog signal processing capabilities.