Abstract
A corner-cube-based integrated retroreflective structure is introduced as a novel instrument for free-space optical (FSO) communications. The structure is composed of three independent and mutually-orthogonal silicon photodiodes (PDs) and is shown to have capabilities for real-time optimization and control by way of differential photocurrent sampling between adjacent PDs. A balanced system with minimal differential signal levels is ultimately indicative of perfect optical alignment and differential triangulation is used to obtain this optimized alignment. Such a scenario is ideallysuited to bi-directional FSO communication links with the fundamental requirements for optical retroreflection, detection, and modulation. Both active downlink and passive uplink FSO communications are demonstrated.
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