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  11. Enhanced 4d-ofdm Optical Communication Systems With Color-coded Constellations And Probability Constellation Shaping

Enhanced 4D-OFDM optical communication systems with color-coded constellations and probability constellation shaping

Dongdong Xu, Bo Liu, Jianxin Ren

    Optics Express
    |November 14, 2024

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    View abstract on PubMed

    Summary
    This summary is machine-generated.

    This study presents a novel four-dimensional constellation for optical Orthogonal Frequency Division Multiplexing (OFDM) transmission, achieving 51.49 Gb/s over 2 km. The new design enhances receiver sensitivity and error performance for short-distance communication.

    Area of Science:

    • Optical communications
    • Signal processing
    • Information theory

    Background:

    • Orthogonal Frequency Division Multiplexing (OFDM) is crucial for high-speed optical transmission.
    • Enhancing constellation mapping is key to improving data rates and receiver sensitivity.
    • Current methods face limitations in spectral efficiency and error performance.

    Purpose of the Study:

    • To introduce a novel four-dimensional probability constellation mapping for OFDM optical transmission.
    • To amalgamate geometric and probability shaping with color coding for enhanced Constellation Figure of Merit (CFM).
    • To evaluate the performance gains in receiver sensitivity and error rate.

    Main Methods:

    • Development of a four-dimensional constellation structure using color coding.

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  • Implementation of a two-dimensional inverse fast Fourier transform (2D-IFFT) based OFDM system.
  • Experimental transmission of signals over a 2 km seven-core optical fiber.

    • Main Results:

    • Successful transmission of OFDM signals at 51.49 Gb/s over a 2 km seven-core fiber.
    • Achieved receiver sensitivity gains of 0.85 dB, 1.33 dB, and 1.83 dB compared to traditional 4D, 3D-OFDM, and 2D-OFDM.
    • Demonstrated a 1.36 dB receiver sensitivity gain over uniform distribution constellations at 4.4 bits/symbol entropy.

    Conclusions:

    • The proposed color-coded four-dimensional constellation significantly enhances receiver sensitivity and error performance.
    • The system shows promising prospects for future short-distance optical communication applications.
    • The combined geometric and probability shaping approach effectively improves CFM.