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Adaptive quadrature-polybinary detection in super-Nyquist WDM systems.

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    This study introduces an adaptive detection method for super-Nyquist wavelength-division multiplexing (WDM) systems. The technique optimizes signal detection by adjusting modulation levels, achieving performance comparable to advanced modulation formats.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Super-Nyquist wavelength-division multiplexing (WDM) systems face challenges in spectral efficiency and receiver complexity.
    • Polarization-division-multiplexed quadrature-phase-shift-keying (PDM-QPSK) is a key modulation format in high-capacity optical networks.

    Purpose of the Study:

    • To propose and evaluate an adaptive detection technique for super-Nyquist PDM-QPSK systems.
    • To investigate the performance of quadrature-duobinary and quadrature four-level polybinary signals in this context.
    • To optimize receiver performance by adapting modulation levels to channel spacing.

    Main Methods:

    • Digital conversion of QPSK signals to quadrature n-level polybinary signals.
    • Utilizing a Maximum Likelihood Sequence Estimation (MLSE) detector at the receiver.
    • Implementing an adaptive modulation level adjustment based on super-Nyquist channel spacing.

    Main Results:

    • Numerical studies demonstrate that adaptive modulation levels improve performance.
    • Experimental transmission of 3-channel 112-Gbit/s PDM-QPSK signals over a 20-GHz channel spacing was achieved.
    • The adaptive detection technique showed performance comparable to PDM 16-ary quadrature-amplitude modulation (16QAM).

    Conclusions:

    • The proposed adaptive detection technique enhances performance in super-Nyquist WDM systems.
    • Adjusting quadrature-polybinary modulation levels optimizes detection for varying channel spacings.
    • This method offers a viable alternative for high-capacity optical transmission.