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Adaptive linearized microwave downconversion utilizing a single dual-electrode Mach-Zehnder modulator.

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    Optics Letters
    |June 2, 2015
    PubMed
    Summary

    An adaptive postprocessing technique enhances analog photonic link linearity by suppressing third-order intermodulation distortion (IMD3). This method significantly improves the spurious-free dynamic range (SFDR) of optical communication systems.

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    Area of Science:

    • Photonics
    • Electrical Engineering
    • Signal Processing

    Background:

    • Analog photonic links are crucial for high-frequency signal transmission.
    • Non-linearity, particularly third-order intermodulation distortion (IMD3), degrades link performance.
    • Existing compensation methods often require complex hardware or extensive system knowledge.

    Purpose of the Study:

    • To propose and demonstrate an adaptive postprocessing approach for improving analog photonic link linearity.
    • To significantly suppress IMD3 without requiring detailed knowledge of the signal's amplitude.
    • To enhance the spurious-free dynamic range (SFDR) of the photonic link.

    Main Methods:

    • Developed an adaptive postprocessing algorithm based on inverse signal transformation.

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  • Implemented the compensation scheme in an experimental down-converted analog photonic link.
  • Characterized link performance using IMD3 measurements and SFDR calculations.

    • Main Results:

    • The adaptive postprocessing effectively suppressed third-order intermodulation distortion (IMD3).
    • The spurious-free dynamic range (SFDR) of the analog photonic link reached approximately 126 dB·Hz(4/5).
    • The compensation scheme requires only knowledge of the signal's frequency and bandwidth.

    Conclusions:

    • Adaptive postprocessing is a viable and effective method for enhancing analog photonic link linearity.
    • The proposed technique offers significant improvements in SFDR with minimal system information.
    • This approach provides a practical solution for mitigating distortion in optical communication systems.