@article{11700kmtransmissionat48bit4dsymvia,
  title = {11,700 km Transmission at 4.8 bit/4D-sym via Four-dimensional Geometrically-shaped Polarization-Ring-Switching Modulation},
  year = {2019},
  eprint = {1904.12561},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1904.12561v1},
}