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Dimension-level constellation disassembly and transmission method based on high-dimensional constellation selective

Jianxin Ren, Haojun Liu, Bo Liu

    Optics Letters
    |November 14, 2025
    PubMed
    Summary

    This study introduces a novel dimension-level constellation decomposition for improved optical communication. This technique enhances receiver sensitivity in intensity modulation/direct detection systems.

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    Area of Science:

    • Optical Communications
    • Digital Signal Processing

    Background:

    • High-dimensional constellations offer increased data rates but face challenges in practical implementation.
    • Constellation shaping is crucial for optimizing performance in intensity modulation/direct detection (IM/DD) systems.

    Purpose of the Study:

    • To propose and validate a dimension-level constellation decomposition transmission scheme.
    • To enhance receiver sensitivity in optical communication systems through advanced constellation shaping.

    Main Methods:

    • Selective mapping of high-dimensional constellations.
    • Utilizing entropy-limited tuning functions and constellation point extraction.
    • Dimensional decomposition and transmission over a 2 km seven-core fiber IM/DD system.

    Main Results:

    • A 0.5 dB improvement in receiver sensitivity for the dimension-decomposed 3D-4-symbol constellation compared to the traditional 3D-4-symbol constellation.
    • A 0.4 dB gain in receiver sensitivity for the dimension-decomposed 3D-8-symbol constellation versus the traditional 3D-8-symbol constellation.

    Conclusions:

    • Dimension-level constellation decomposition is an effective strategy for improving receiver sensitivity.
    • The proposed scheme offers practical benefits for future high-capacity optical communication systems.