A modern application is to connect the LANs in two buildings via lasers mounted on their rooftops.
So each building needs its own laser and its own photo detector.
PROS
Lasers are unidirectional with high bandwidth and low cost.
It is also easy to install and does not require an FCC (Federal Communications Commission) license.
The laser’s strength a very narrow beam is its weakness but 1mm wide beam at a target 1mm wide 500 meters away requires.
Cons
A disadvantage is that laser beams cannot penetrate rain or thick fog.
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