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    Area of Science:

    • Photonics and Optoelectronics
    • Radio Frequency (RF) Engineering
    • Signal Processing

    Background:

    • Traditional radio frequency (RF) heterodyne receivers often struggle with image frequency interference, degrading signal quality.
    • Optoelectronic oscillators (OEOs) offer high-frequency signal generation capabilities but integrating them with effective image rejection remains a challenge.

    Purpose of the Study:

    • To propose and demonstrate a tunable OEO-based photonic RF heterodyne receiver.
    • To achieve simultaneous local oscillator (LO) generation and broadband RF signal mixing with effective image frequency rejection.

    Main Methods:

    • Utilized a tunable OEO incorporating a dual-electrode Mach-Zehnder modulator (DEMZM) for LO generation and RF signal mixing.
    • Employed two beating channels in the optical domain by mixing LO sidebands with input RF sidebands.
    • Implemented quadrature combining of the two intermediate frequency (IF) channels by setting the DEMZM bias angle.

    Main Results:

    • Successfully demonstrated a photonic RF heterodyne receiver capable of image frequency rejection.
    • Achieved reception of RF signals in the 8.85 to 14.85 GHz range.
    • Obtained a high image rejection ratio of 42.6 dB and a spurious free dynamic range exceeding 94.8 dB·Hz2/3.

    Conclusions:

    • The proposed OEO-based photonic receiver effectively suppresses image frequencies through quadrature combining of IF signals.
    • The integrated DEMZM functions as both a high-quality LO source and a broadband mixer, simplifying receiver architecture.
    • This technology offers a promising solution for high-performance RF signal reception with enhanced dynamic range and selectivity.