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Variable length RNP-Huffman coding for short block-length shaping in optical communications.

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    This study presents Recursive Node Partitioning-Huffman coding for efficient optical communication. This new method improves transmission distance by 350 km, outperforming 64-Quadrature Amplitude Modulation.

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    Area of Science:

    • Optical Communications
    • Information Theory
    • Digital Signal Processing

    Background:

    • Efficient short block-length shaping is crucial for high-speed optical communications.
    • Existing methods face limitations in performance at short block lengths.

    Purpose of the Study:

    • To introduce a novel Recursive Node Partitioning-Huffman (RNP-Huffman) coding scheme.
    • To enable efficient short block-length shaping for Amplitude Shift Keying (ASK) signals.

    Main Methods:

    • Grouping input bits into uniformly distributed symbols.
    • Applying recursive partitioning of symbols with Huffman coding.
    • Mapping branch identifiers to ASK amplitudes with a target distribution.

    Main Results:

    • Achieved low Kullback-Leibler (KL)-divergence and rate loss at small average block-lengths.
    • Generated variable-length output shaped ASK amplitude sequences with a pre-set distribution.
    • Demonstrated a 350 km transmission distance improvement over uniform 64-Quadrature Amplitude Modulation (64QAM).

    Conclusions:

    • RNP-Huffman coding is a promising technique for short block-length shaping.
    • The scheme offers significant improvements in transmission distance for optical communications.
    • Effective for high-speed optical communication systems requiring efficient shaping.