Figure 2 | Scientific Reports

Figure 2

From: High-Capacity Free-Space Optical Communications Between a Ground Transmitter and a Ground Receiver via a UAV Using Multiplexing of Multiple Orbital-Angular-Momentum Beams

Figure 2

Experimental setup of an FSO communication link between a UAV and a ground station using OAM multiplexing. (a) Schematic diagram of the ground station and the UAV. (b) Ground station setup, including the OAM transmitter, the OAM receiver and the beam tracking system. BS: beamsplitter; EDFA: Erbium-doped-fibre-amplifier; FSM: fast-steering mirror; FSO: free-space optical; OAM: orbital-angular-momentum; PSD: position sensitive detector; QPSK: quadrature-phase-shift-keying; Rx: receiver; Tx: transmitter; UAV: unmanned-aerial-vehicle. Focal lengths of lenses: f 1: 50 mm; f 2: 500 mm; f 3: 600 mm; f 4: 75 mm; f 5: 100 mm; f 6: 100 mm.

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