@article{trainingofphotonicneuralnetworksthrough,
  title = {Training of photonic neural networks through in situ backpropagation},
  author = {Tyler W. Hughes and Momchil Minkov and Yu Shi and Shanhui Fan},
  year = {2018},
  eprint = {1805.09943},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1805.09943v1},
}