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Optimizing the linearity in high-speed photodiodes.

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    New photodetectors achieve highly linear optical-to-electrical conversion of ultrashort optical pulses. This breakthrough minimizes signal distortion and noise, advancing radio-over-fiber and other microwave photonics applications.

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    Area of Science:

    • Photonics
    • Electrical Engineering
    • Signal Processing

    Background:

    • Analog photonic links need high-fidelity optical-to-electrical conversion.
    • Photodetector nonlinearity causes signal distortion and noise, especially with ultrashort optical pulses.

    Purpose of the Study:

    • To demonstrate photodetectors with unprecedented linearity for ultrashort optical pulse conversion.
    • To understand and mitigate photodetector nonlinearity through circuit impedance manipulation.

    Main Methods:

    • Utilized photodetectors designed for high power handling and linearity.
    • Investigated the impact of broadband circuit impedance on photodiode linearity.
    • Externally manipulated circuit impedance to extend the linear operating range.

    Main Results:

    • Achieved unprecedented linearity in optical-to-electrical conversion of ultrashort optical pulses.
    • Demonstrated over 50 dB rejection of amplitude-to-phase conversion up to 40 mA photocurrent.
    • Extended the linear range by 1000-fold compared to state-of-the-art photodiodes.
    • Increased attainable microwave power by a factor of four.

    Conclusions:

    • Eliminated the need for precise tuning of photodiode operating parameters to minimize nonlinearity.
    • Significant advancement for ultrashort pulse detection and microwave photonics.
    • Results are broadly applicable to reducing nonlinear distortion in various photonic systems.