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Shaping lightwaves in time and frequency for optical fiber communication

Author

Listed:
  • Junho Cho

    (Nokia Bell Labs)

  • Xi Chen

    (Nokia Bell Labs)

  • Greg Raybon

    (Nokia Bell Labs)

  • Di Che

    (Nokia Bell Labs)

  • Ellsworth Burrows

    (Nokia Bell Labs)

  • Samuel Olsson

    (Nokia)

  • Robert Tkach

    (Nokia Bell Labs)

Abstract

In optical communications, sphere shaping is used to limit the energy of lightwaves to within a certain value over a period. This minimizes the energy required to contain information, allowing the rate of information transmission to approach the theoretical limit if the transmission medium is linear. However, when shaped lightwaves are transmitted through optical fiber, Kerr nonlinearity manifests itself as nonlinear interference in a peculiar way, potentially lowering communications capacity. In this article, we show that the impact of sphere shaping on Kerr nonlinearity varies with chromatic dispersion, shaping block length and symbol rate, and that this impact can be predicted using a novel statistical measure of light energy. As a practical consequence, by optimally controlling the parameters of sphere-shaped lightwaves, it is experimentally demonstrated that the information rate can be increased by up to 25% in low-dispersion channels on a 2824 km dispersion-managed wavelength-division multiplexed optical fiber link.

Suggested Citation

  • Junho Cho & Xi Chen & Greg Raybon & Di Che & Ellsworth Burrows & Samuel Olsson & Robert Tkach, 2022. "Shaping lightwaves in time and frequency for optical fiber communication," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28349-x
    DOI: 10.1038/s41467-022-28349-x
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    References listed on IDEAS

    as
    1. Partha P. Mitra & Jason B. Stark, 2001. "Nonlinear limits to the information capacity of optical fibre communications," Nature, Nature, vol. 411(6841), pages 1027-1030, June.
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