I just got out of a meeting in which the topic of "free space optics" came up. We were discussing wireless ways to get from our network to a customer who for whatever reason, we can't run coax to. FSO is apparently one of the options we're looking at. In essence, FSO allows you to transmit high bandwidth via lasers over a range of about 500M to 1Km. It's an alternative to radio, and operates in an unlicensed portion of the EM spectrum.
Pretty neat.
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