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Photonic RF vector signal generation with enhanced spectral efficiency using precoded double single-sideband

Yuanquan Wang, Hung-Chang Chien, HaiChao Guo

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    This study introduces a new method for generating photonic vector signals using double single sidebands (SSBs). This approach doubles spectral efficiency for radio frequency (RF) signal generation, achieving high-order modulation formats like 7-PSK.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Signal Processing

    Background:

    • Photonic vector signal generation is crucial for high-capacity wireless communication systems.
    • Existing methods often face limitations in spectral efficiency and modulation complexity.

    Purpose of the Study:

    • To propose and demonstrate a novel photonic vector signal generation scheme.
    • To enhance spectral efficiency in radio frequency (RF) signal generation.
    • To achieve high-order modulation formats like 7-PSK.

    Main Methods:

    • Generation of double single sidebands (SSBs) carrying independent quadrature-amplitude-modulation (QAM) signals.
    • Utilizing a single in-phase/quadrature (I/Q) modulator with phase and amplitude precoding.
    • Implementing differential coding for accurate demodulation.

    Main Results:

    • Demonstrated 10-Gbaud 7-PSK vector signal generation at 20 GHz.
    • Achieved doubled spectral efficiency compared to conventional methods.
    • Obtained a bit-error ratio below the forward-error-correction threshold after 10 km fiber transmission.

    Conclusions:

    • The proposed double SSB beating scheme offers a viable method for efficient photonic vector signal generation.
    • This technique enables flexible generation of complex modulation formats with enhanced spectral efficiency.
    • The results show potential for advanced optical wireless communication systems.