A coaxially integrated photonic orbital angular momentum beam multiplexer

@article{Xiao2016ACI,
  title={A coaxially integrated photonic orbital angular momentum beam multiplexer},
  author={Qingsheng Xiao and Charalambos Klitis and Hui Chen and Shimao Li and Yujie Chen and Jiangbo Zhu and Xinlun Cai and Marc Sorel and Siyuan Yu},
  journal={2016 IEEE 13th International Conference on Group IV Photonics (GFP)},
  year={2016},
  pages={114-115}
}
We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of four nested arc waveguide gratings. Well-defined OAM mode emissions over wide bandwidth of 1-nm enables simultaneous wavelength division multiplexing and OAM multiplexing. 

Figures from this paper.