Atmospheric turbulence mitigation in an OAM-based MIMO free-space optical link using spatial diversity combined with MIMO equalization

作者：Ren Yongxiong^*; Wang Zhe; Xie Guodong; Li Long; Willner Asher J; Cao Yinwen; Zhao Zhe; Yan Yan; Ahmed Nisar; Ashrafi Nima; Ashrafi Solyman; Bock Robert; Tur Moshe; Willner Alan E

来源：Optics Letters, 2016, 41(11): 2406-2409.

DOI：10.1364/OL.41.002406

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 x 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.

• 出版日期2016-6-1