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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Information Theory

    Background:

    • Ultra-wideband (UWB) technology offers high-speed, low-power transmission but faces integration challenges with wavelength-division multiplexing (WDM).
    • Orbital angular momentum (OAM) multiplexing increases capacity density in UWB systems but suffers from inter-mode crosstalk in few-mode fibers (FMF), degrading performance.
    • Existing methods struggle to balance high capacity with signal integrity in advanced communication systems.

    Purpose of the Study:

    • To propose and validate a novel scheme combining probabilistic amplitude shaping (PAS) with OAM-multiplexed UWB systems.
    • To mitigate inter-mode crosstalk and improve signal quality in FMF transmission.
    • To enhance the overall communication capacity density and receiver sensitivity.

    Main Methods:

    • Incorporation of probabilistic amplitude shaping (PAS) using a constant composition distribution matcher (CCDM) and low-density parity-check (LDPC) coding for joint shaping and error correction.
    • Application of discrete Fourier transform (DFT) precoding to equalize signal-to-noise ratio (SNR) across subcarriers and suppress high peak-to-average power ratio (PAPR).
    • Experimental transmission of a 4-channel OAM-multiplexed UWB signal over 5 km of FMF.

    Main Results:

    • Successful demonstration of 1.89 x 4 Gbit/s transmission using the proposed PAS-enhanced OAM-multiplexed UWB system.
    • Significant improvements in optical receiver sensitivity compared to unshaped 64-QAM signals (7.5 dB, 6.5 dB, 6.0 dB at different symbol rates).
    • An additional 0.5 dB sensitivity gain was achieved by probabilistic shaping, reducing high-amplitude symbol occurrences.

    Conclusions:

    • The proposed PAS scheme effectively enhances the performance of OAM-multiplexed UWB systems by mitigating crosstalk and improving receiver sensitivity.
    • This approach offers a viable solution for increasing capacity density in future high-speed optical communication networks.
    • The joint optimization of shaping and error correction, along with precoding techniques, proves crucial for robust signal transmission.