![]() ![]() In this paper a low-cost FSO system transceiver that can “out-of-the-box”, locate and self align to any neighbouring transceiver within 1 km is presented. ![]() However, such systems require accurate alignment between sender and receiver without extensive manual pre-alignment or setup achieving this at a sustainable cost-point has been a limiting factor in the uptake of this technology. Such systems have been demonstrated in both multi-mode fibre 15– 17, in turbulent FSO links 11, 18– 20, in submersed channels 21, 22 and combined with retro-reflectors on moving platforms 23. Space division multiplexing systems use orthogonal or spatially separable optical modes to multiplex many encoded data channels within a communication system 10. In recent years the deployment of space division multiplexing within FSO systems has been suggested as an exciting method for increasing communication bandwidth over point-to-point links 9– 14. Such systems can be used in both urban and data centre environments. However, low complexity opto-mechanical systems that can locate and align to any neighbouring transceiver would be an enabler for commercially viable optical mesh networking. ![]() Laser communication systems, with mechanical alignment and tracking, have been developed based on fast steering-mirror and scanning galvo mirror systems 8. Such technologies are widely implemented into modern telescopes 7. Mechanical tracking systems for maintaining optical alignment in astronomical systems have a long history dating back to the late 1600s, when Giovanni Alfonso Borelli and contemporaries developed the heliostat for tracking a particular point in the night sky 6. FSO systems that can seamlessly integrate with standard optical hardware offer many exciting use-cases. Generally, such systems are designed with internal lasers and large area detectors, which limits the ability of these systems to be integrated into existing optical network infrastructure and has limited deployment to bespoke, or ad-hoc networking applications. More recently, point-to-point optical systems have been bridging the distance between earth and space, enabling both classical 4 and quantum 5 optical systems. FSO systems have been widely used in military and space-based communications systems, however the cost of these systems are prohibitive for deployment in rural communities 2, 3. Free-Space Optical (FSO) systems can play a central role in providing high-speed network provision to rural communities and replace fibre network breakages arising from environmental disasters 1. ![]()
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