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Digital pre-distortion for mitigating modulation nonlinearity in dually modulated EML optical SSB transmitters.

Shuhua Zhao, Tianwai Bo, Zhongwei Tan

    Optics Letters
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    Summary

    Digital pre-distortion effectively mitigates nonlinear distortions in dual electro-absorption modulation lasers (D-EMLs). This improves signal quality and chromatic dispersion tolerance for optical single sideband transmitters.

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    Area of Science:

    • Optical communications
    • Photonics
    • Signal processing

    Background:

    • Dual modulation of electro-absorption modulation lasers (D-EMLs) offers a compact optical single sideband (SSB) transmitter.
    • Nonlinear distortions from cascade modulation degrade D-EML signal quality.

    Purpose of the Study:

    • To mitigate modulation nonlinearity in D-EML transmitters.
    • To enhance signal quality and fiber chromatic dispersion tolerance for optical SSB signals.

    Main Methods:

    • Implementation of digital pre-distortion (DPD) technique.
    • Experimental demonstration using a 56-Gb/s optical SSB transmission system.

    Main Results:

    • Significant improvements in signal-to-noise ratio (SNR) and bit error rate (BER).
    • Demonstrated enhanced tolerance against fiber chromatic dispersion.
    • Achieved power budget enhancements of ~1.1 dB and ~2.3 dB compared to conventional SSB signals.

    Conclusions:

    • DPD is an effective method to combat nonlinearity in D-EML transmitters.
    • The proposed scheme enhances optical SSB signal performance for high-speed transmission.
    • DPD improves system robustness and power budget for optical communication systems.