title: Experimental demonstration of a 200-Gbit/s free-space optical link by multiplexing Laguerre-Gaussian beams with different radial indices.
abstract: We demonstrate a 200-Gbit/s space-division multiplexing system using two Laguerre-Gaussian (LG) beams with different radial indices (LGℓ=0,p=0and LGℓ=0,p=1). With a proper design of the radial change of the demultiplexing pattern, the channel crosstalk could be minimized and both channels could achieve a bit error rate of 3.8×10-3. Moreover, the multiplexing of four LG beams with different azimuthal indices and different radial indices (e.g., LGℓ=0,p=0, LGℓ=0,p=1, LGℓ=1,p=0, and LGℓ=1,p=1beams) is also demonstrated with a <-12  dB channel crosstalk, potentially enabling a 400-Gbit/s data transmission.
authors.forename: Guodong
authors.initials: G
authors.lastname: Xie
authors.forename: Yongxiong
authors.initials: Y
authors.lastname: Ren
authors.forename: Yan
authors.initials: Y
authors.lastname: Yan
authors.forename: Hao
authors.initials: H
authors.lastname: Huang
authors.forename: Nisar
authors.initials: N
authors.lastname: Ahmed
authors.forename: Long
authors.initials: L
authors.lastname: Li
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhao
authors.forename: Changjing
authors.initials: C
authors.lastname: Bao
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
authors.forename: Solyman
authors.initials: S
authors.lastname: Ashrafi
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner