Sensitivity gains by mismatched probabilistic shaping for optical communication systems

T. Fehenberger, D. Lavery, R. Maher, A. Alvarado, P. Bayvel, N. Hanik

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Probabilistic shaping of quadrature amplitude modulation (QAM) is used to enhance the sensitivity of an optical communication system. Sensitivity gains of 0.43 and 0.8 dB are demonstrated in back-to-back experiments by the shaping of 16QAM and 64QAM, respectively. Furthermore, numerical simulations are used to prove the robustness of probabilistic shaping to a mismatch between the constellation used and the signal-to-noise ratio (SNR) of the channel. It is found that, accepting a 0.1-dB SNR penalty, only four shaping distributions are required to support these gains for 64QAM.
Original languageEnglish
Pages (from-to)786-789
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number7
Publication statusPublished - 1 Apr 2016


  • Achievable information rates
  • digital coherent transceivers
  • digital signal processing
  • mutual information
  • probabilistic shaping
  • signal shaping


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