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Related Experiment Videos

Performance enhanced DDO-OFDM system with adaptively partitioned precoding and single sideband modulation.

Xi Chen, Zhenhua Feng, Ming Tang

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    This study introduces an adaptive precoding algorithm for direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems. The new method achieves high transmission capacity and reduces peak-to-average power ratio (PAPR), enhancing optical communication performance.

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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • Direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) is crucial for short-to-medium reach systems.
    • Precoding techniques enhance DDO-OFDM performance by reducing PAPR and equalizing SNR.
    • Conventional precoding limitations hinder optimal SNR variation and modulation format allocation.

    Purpose of the Study:

    • To investigate the SNR variation principle in precoded DDO-OFDM systems.
    • To propose an adaptively partitioned precoding (APP) algorithm for improved SNR control.
    • To enhance the transmission capacity and performance of DDO-OFDM systems.

    Main Methods:

    • Theoretical analysis of SNR variation and noise equalization in precoded DDO-OFDM.
    • Development of the adaptively partitioned precoding (APP) algorithm.

    Related Experiment Videos

  • Implementation of single sideband (SSB) modulation to mitigate chromatic dispersion (CD).

    • Main Results:

    • The APP algorithm achieves transmission capacity comparable to the Levin-Campello (LC) algorithm.
    • The APP algorithm offers nearly 1 dB PAPR reduction.
    • APP algorithm demonstrates low complexity due to look-up table (LUT) operation.
    • SSB modulation, optimized for modulation index, matches double sideband (DSB) capacity in back-to-back configurations.

    Conclusions:

    • The proposed APP algorithm effectively controls subcarrier SNR, unlocking system capacity.
    • APP-based SSB-DDO-OFDM enhances performance for cost-sensitive short-to-medium reach optical systems.
    • The integration of APP and SSB modulation presents a robust solution for optical fiber communications.