Exploring and Experimenting With Shaping Designs for Next-Generation Optical Communications Academic Article uri icon


  • 2018 IEEE. A class of circular 64-QAM that combines 'geometric' and 'probabilistic' shaping aspects is presented. It is compared to square 64-QAM in back-to-back, single-channel, and wavelength division multiplexing (WDM) transmission experiments. First, for the linear additive white Gaussian noise channel model, it permits to operate close to the Shannon limits for a wide range of signal-to-noise ratios. Second, WDM simulations over several hundreds of kilometers show that the obtained signal-to-noise ratios are equivalent to-or slightly exceed-those of probabilistic shaped 64-QAM. Third, for real-life validation purpose, an experimental comparison with unshaped 64-QAM is performed where 28% distance gains are recorded when using 19 channels at 54.2 GBd. This again is in line-or slightly exceeds-the gains generally obtained with probabilistic shaping. Depending upon implementation requirements (core forward-error correcting scheme for example), the investigated modulation schemes may be key alternatives for next-generation optical systems.

published proceedings


altmetric score

  • 7.5

author list (cited authors)

  • Jardel, F., Eriksson, T. A., Measson, C., Ghazisaeidi, A., Buchali, F., Idler, W., & Boutros, J. J.

citation count

  • 11

complete list of authors

  • Jardel, Fanny||Eriksson, Tobias A||Measson, Cyril||Ghazisaeidi, Amirhossein||Buchali, Fred||Idler, Wilfried||Boutros, Joseph J

publication date

  • September 2018