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An approach for linear optical phase demodulation using a single photodetector.

Changlin Liu, Huixing Zhang, Aijun Wen

    Optics Letters
    |May 1, 2023
    PubMed
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    This study introduces a phase-modulated radio-over-fiber link for linear radio frequency signal transmission. Using the Kramers-Kronig algorithm, it achieves linear demodulation with a single photodetector, enhancing performance and simplifying receiver design.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Signal Processing

    Background:

    • Radio-over-fiber (RoF) systems are crucial for transmitting radio frequency (RF) signals over optical fiber infrastructure.
    • Traditional RoF links often require complex coherent receivers for linear signal demodulation, increasing cost and complexity.
    • Achieving high linearity in RoF links is essential for supporting advanced modulation formats and ensuring signal integrity.

    Purpose of the Study:

    • To propose and experimentally verify a novel phase-modulated RoF link.
    • To demonstrate linear optical phase demodulation using the Kramers-Kronig (KK) algorithm.
    • To simplify the receiver architecture by employing a single photodetector.

    Main Methods:

    • Implementation of a phase-modulated RoF link architecture.
    • Application of the Kramers-Kronig (KK) algorithm at the receiver for signal demodulation.
    • Experimental transmission of microwave vector signals using 16-quadrature amplitude modulation (16-QAM) and 64-QAM.

    Main Results:

    • Successful linear transmission of RF signals over a 25-km fiber link.
    • Measured error vector magnitudes (EVMs) of 4.14% for 16-QAM and 4.38% for 64-QAM.
    • Achieved a spurious-free dynamic range (SFDR) of 114.5 dB·Hz2/3, indicating excellent linearity.

    Conclusions:

    • The proposed phase-modulated RoF link effectively achieves linear RF signal transmission.
    • The KK algorithm enables linear demodulation with a simplified single-photodetector receiver.
    • The demonstrated performance metrics confirm the link's suitability for high-performance optical wireless communication systems.