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Photonics-enabled simultaneous self-interference cancellation and image-reject mixing.

Dan Zhu, Xiaopeng Hu, Wenjuan Chen

    Optics Letters
    |November 16, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel photonic approach for in-band full-duplex radio-frequency (RF) systems, enabling simultaneous self-interference cancellation and image-reject mixing. This method overcomes limitations of previous electrical techniques, offering broader bandwidth and frequency capabilities.

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    Area of Science:

    • Photonics
    • Radio-Frequency Engineering
    • Optical Signal Processing

    Background:

    • In-band full-duplex radio-frequency (RF) systems face significant challenges from self-interference and image interference.
    • Existing photonic solutions typically address either self-interference cancellation or image-reject mixing, not both simultaneously.
    • Current methods combining both functions rely on electrical components, limiting bandwidth and operational frequency.

    Purpose of the Study:

    • To propose and demonstrate a novel photonic approach for simultaneous self-interference cancellation and image-reject mixing in RF systems.
    • To overcome the bandwidth and frequency limitations of existing electrical methods.
    • To achieve robust performance in practical RF system applications.

    Main Methods:

    • Utilizing a single polarization-multiplexed 90° optical hybrid to introduce simultaneous phase shifts (0, π, π/2, 3π/2) in the optical domain.
    • Implementing power weighting and time delay for self-interference cancellation via optical methods using polarization multiplexing.
    • Conducting both theoretical analysis and experimental validation of the proposed photonic approach.

    Main Results:

    • Achieved simultaneous self-interference cancellation and image-reject mixing using purely optical methods.
    • Demonstrated a self-interference cancellation depth of 35 dB over 100 MHz, 24 dB over 400 MHz, and 18 dB over 1 GHz in X and Ku bands.
    • Obtained an image-rejection ratio exceeding 53 dB over 1 GHz in the X band.

    Conclusions:

    • The proposed photonic approach effectively addresses simultaneous self-interference cancellation and image-reject mixing for in-band full-duplex RF systems.
    • This optical method offers significant advantages in terms of bandwidth and frequency range compared to electrical techniques.
    • The demonstrated performance validates the potential of this photonic solution for advanced RF communication systems.