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Related Experiment Videos

High-order modulation on a single discrete eigenvalue for optical communications based on nonlinear Fourier

Tao Gui, Chao Lu, Alan Pak Tao Lau

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    This study explores high-order modulation using the nonlinear Fourier transform (NFT) framework. Researchers achieved a record 6 bits/symbol transmission by optimizing spectral amplitude and eigenvalue modulation, mitigating nonlinear inter-symbol interference.

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    Area of Science:

    • Optical communications
    • Nonlinear optics
    • Signal processing

    Background:

    • The nonlinear Fourier transform (NFT) framework offers new possibilities for high-capacity optical data transmission.
    • Exploiting all degrees of freedom for information encoding within the NFT is crucial for advancing spectral efficiency.

    Purpose of the Study:

    • To experimentally investigate high-order modulation schemes over a single discrete eigenvalue within the NFT framework.
    • To optimize modulation formats for spectral amplitude, phase, and eigenvalue, aiming to maximize data rates and transmission distances.

    Main Methods:

    • Comparison of different 4 bit/symbol modulation formats on spectral amplitude for a fixed eigenvalue.
    • Analysis of joint spectral phase, spectral magnitude, and eigenvalue modulation.

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  • Proposal and application of a spectral amplitude scaling method to mitigate nonlinear inter-symbol interference (ISI).

    • Main Results:

    • A 2-ring 16-APSK constellation demonstrated optimal performance for spectral amplitude modulation.
    • Modulation on the real part of the eigenvalue proved more bandwidth-efficient but caused pulse timing drift and nonlinear ISI.
    • A record 6 bit/symbol (4 GBaud 16-APSK on spectral amplitude + 2-bit eigenvalue modulation) transmission was achieved at 24 Gb/s over 1000 km.

    Conclusions:

    • High-order modulation within the NFT framework can significantly enhance spectral efficiency.
    • Careful joint modulation of spectral amplitude, phase, and eigenvalue is necessary to balance performance and mitigate nonlinear effects like ISI.
    • The proposed spectral amplitude scaling method effectively combats nonlinear ISI, enabling record-breaking data transmission.