Fig. 1: Examples of applications using long-haul (>1 km) APLs.
From: Low-loss microwave photonics links using hollow core fibres
Fibre links are shown as red lines. a, b Examples of APL use in civil applications, and c, d in military and science applications, respectively. a Connection of a large number of remote radio heads (RRH) for wireless communications providing connectivity, but also timing/positioning (e.g., in a tunnel). b Monitoring and identification of foreign objects over a large area such as a runway. c Military (high dynamic range) radar systems. d Radio antenna arrays for exploring objects in deep space
