High-Capacity Free-Space Optical(FSO) Communications Between a Ground Transmitter and a Ground Receiver via a UAV Using Multiplexing of Multiple Orbital-Angular-Momentum(OAM) Beams — PART 1

Unmanned-aerial-vehicle(UAV)
Different columns show the beam helical structures, phase fronts, and corresponding intensity distributions.

Alignment

Low crosstalk and power-coupling loss rely on accurate axis alignment. If you think about it align two different objects when one is moving around is not a simple task. We need a technique that guarantees a reliable link between the two stations.

Turbulence

This one strikes me the most. The turbulence generated by the propellers could distort the OAM beam's phase front, increasing power fluctuations, and intermodal crosstalk.

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