Atmospheric turbulence effects on the performance of a free space optical link employing orbital angular momentum multiplexing
Yongxiong Ren(University of Southern California), Hao Huang(University of Southern California), Guodong Xie(University of Southern California), Nisar Ahmed(University of Southern California), Yan Yan(University of Southern California), Baris I. Erkmen(Jet Propulsion Laboratory), Nivedita Chandrasekaran(Massachusetts Institute of Technology), Martin P. J. Lavery(University of Glasgow), Nicholas K. Steinhoff(Optical Sciences Company (United States)), Moshe Tur(Tel Aviv University), S. Dolinar(Jet Propulsion Laboratory), Mark A. Neifeld(University of Arizona), Miles J. Padgett(University of Glasgow), Robert W. Boyd(University of Rochester), Jeffrey H. Shapiro(Massachusetts Institute of Technology), Alan E. Willner(University of Southern California)
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Abstract
We experimentally investigate the performance of an orbital angular momentum (OAM) multiplexed free space optical (FSO) communication link through emulated atmospheric turbulence. The turbulence effects on the crosstalk and system power penalty of the FSO link are characterized. The experimental results show that the power of the transmitted OAM mode will tend to spread uniformly onto the neighboring mode in medium-to-strong turbulence, resulting in severe crosstalk at the receiver. The power penalty is found to exceed 10 dB in a weak-to-medium turbulence condition due to the turbulence-induced crosstalk and power fluctuation of the received signal.
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