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    Area of Science:

    • Optical Communications
    • Information Theory
    • Digital Signal Processing

    Background:

    • Coherent optical orthogonal frequency division multiplexing (CO-OFDM) is a key technology for high-speed optical transmission.
    • Existing coding schemes in CO-OFDM systems face limitations in achieving higher spectral efficiency and lower error rates.
    • The need for cost-effective solutions with relaxed hardware requirements, such as laser linewidth, is critical for practical deployment.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel polar coded CO-OFDM system.
    • To theoretically analyze the principles of polar coded CO-OFDM signals and discuss suitable decoding methods.
    • To evaluate the performance gains of the proposed polar coded CO-OFDM system compared to conventional and LDPC coded systems.

    Main Methods:

    • Theoretical illustration of the polar coded CO-OFDM signal principle.
    • Discussion of an appropriate polar decoding method for the system.
    • Experimental demonstration and performance evaluation of the proposed system.

    Main Results:

    • The polar coded CO-OFDM system achieved a net coding gain (NCG) exceeding 10 dB at a bit error rate (BER) of 10-3 over a 25-Gb/s, 480-km transmission, outperforming conventional CO-OFDM.
    • Compared to a 25-Gb/s low-density parity-check (LDPC) coded CO-OFDM system over 160 km, the polar code provided an NCG of 0.88 dB at BER = 10-3.
    • The polar code significantly relaxed the laser linewidth requirement, paving the way for more cost-effective CO-OFDM systems.

    Conclusions:

    • The proposed polar coded CO-OFDM system offers substantial performance enhancements, including significant net coding gain.
    • Polar coding presents a viable and advantageous alternative to existing coding schemes like LDPC in CO-OFDM systems.
    • The system's ability to reduce hardware constraints, particularly laser linewidth, contributes to a more economical and practical optical communication solution.