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Abstract
Indoor free-space optical communication (FSO) provides orders of magnitude larger usable bandwidth compared to radio-frequency links but suffers from an intrinsic trade-off between areal coverage and received power. In this paper, we report a dynamic indoor FSO system enabled by a line-of-sight optical link featuring advanced beam control capabilities. The optical link herein utilizes a passive target acquisition scheme by combining a beam steering and beam shaping transmitter with a receiver adorned with a ring-shaped retroreflector. When controlled by an efficient beam scanning algorithm, the transmitter is capable of locating the receiver with millimeter-scale accuracy over a distance of 3 m with a full viewing angle of ${{\pm 11.25}}^\circ$ in the vertical direction and ${{\pm 18.75}}^\circ$ in the horizontal direction within ${1.162}\;{{\pm}}\;{0.005}\;{\rm{s}}$, regardless of the receiver’s positions. We also demonstrate 1 Gbit/s data rate with bit error rates below ${{4}} \times {{10}^{- 7}}$ using an 850 nm laser diode with only 2 mW of output power.
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