@article{orbitalangularmomentummodegroup,
  title = {Orbital-angular-momentum mode-group multiplexed transmission over a graded-index ring-core fiber based on receive diversity and maximal ratio combining},
  year = {2017},
  eprint = {1711.04646},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1711.04646v1},
}