400-Gbit/s free-space optical communications link over 120-meter using multiplexing of 4 collocated orbital-angular-momentum beams.

Yongxiong Ren Zhe Wang Peicheng Liao Long Li Guodong Xie Hao Huang Zhe Zhao Yan Yan Nisar Ahmed Martin P. J. Lavery Nima Ashrafi Solyman Ashrafi Roger D. Linquist Moshe Tur Ivan B. Djordjevic Mark A. Neifeld Alan E. Willner

Published in: OFC (2015)

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