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Processing for dispersive intensity-modulation and direct-detection fiber-optic communications.

Ji Zhou, Haide Wang, Yuanhua Feng

    Optics Letters
    |December 28, 2020
    PubMed
    Summary

    This study introduces a joint optical and digital signal processing method to overcome chromatic dispersion (CD) in intensity-modulation/direct-detection (IM/DD) fiber-optic systems. This approach enables a record 72 Gbit/s transmission over 100 km of dispersion-uncompensated fiber.

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    Last Updated: Nov 24, 2025

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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • Chromatic dispersion (CD) poses a significant challenge in intensity-modulation and direct-detection (IM/DD) fiber-optic systems.
    • Traditional digital signal processing methods struggle to compensate for CD due to the one-dimensional nature of modulation and detection.

    Purpose of the Study:

    • To propose and demonstrate a novel joint optical and digital signal processing technique for effective CD compensation in IM/DD systems.
    • To enhance the capacity-distance product of IM/DD fiber-optic communications.

    Main Methods:

    • Implementing negative chirp via self-phase modulation for partial optical CD suppression.
    • Designing digital signal processing based on a dispersive channel model for accurate CD distortion compensation.

    Main Results:

    • Achieved a record C-band 72 Gbit/s optical on-off keying transmission.
    • Successfully transmitted over a 100 km dispersion-uncompensated link with approximately 1700 ps/nm dispersion.
    • Met the 7% hard-decision forward error correction limit.

    Conclusions:

    • Joint optical and digital signal processing is an effective strategy for mitigating CD-induced distortions.
    • This combined approach significantly improves the capacity-distance product in IM/DD fiber-optic communications.