title: Atmospheric turbulence mitigation in an OAM-based MIMO free-space optical link using spatial diversity combined with MIMO equalization.
abstract: We explore the mitigation of atmospheric turbulence effects for orbital angular momentum (OAM)-based free-space optical (FSO) communications with multiple-input multiple-output (MIMO) architecture. Such a system employs multiple spatially separated aperture elements at the transmitter/receiver, and each transmitter aperture contains multiplexed data-carrying OAM beams. We propose to use spatial diversity combined with MIMO equalization to mitigate both weak and strong turbulence distortions. In a 2×2 FSO link with each transmitter aperture containing two multiplexed OAM modes of ℓ=+1 and ℓ=+3, we experimentally show that at least two OAM data channels could be recovered under both weak and strong turbulence distortions using selection diversity assisted with MIMO equalization.
authors.forename: Yongxiong
authors.initials: Y
authors.lastname: Ren
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.forename: Guodong
authors.initials: G
authors.lastname: Xie
authors.forename: Long
authors.initials: L
authors.lastname: Li
authors.forename: Asher J
authors.initials: AJ
authors.lastname: Willner
authors.forename: Yinwen
authors.initials: Y
authors.lastname: Cao
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Yan
authors.forename: Nisar
authors.initials: N
authors.lastname: Ahmed
authors.forename: Nima
authors.initials: N
authors.lastname: Ashrafi
authors.forename: Solyman
authors.initials: S
authors.lastname: Ashrafi
authors.forename: Robert
authors.initials: R
authors.lastname: Bock
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner