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Free space optical (FSO) communications using orbital angular momentum (OAM)modes has recently received a considerable interest. Propagating OAM modesthrough free space may be subject to atmospheric turbulence (AT) distortionsthat cause intermodal crosstalk and power disparities between OAM modes. Inthis article, we are interested in 2x2 multiple-input multiple-output (MIMO)FSO coherent communication systems using OAM. We propose a selection criterionfor OAM modes to minimize the impact of AT. To further improve the obtainedperformance, we propose a space-time (ST) coding scheme at the transmitter.Through numerical simulations of the error probability, we show that thepenalty from AT is completely absorbed for weak AT and considerable codinggains are obtained in the strong AT regime.

OAM Mode Selection and Space-Time Coding for Turbulence Mitigation in FSO Communication