Optical satellite communication
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Answer:
Optical satellite communication already is complementing satellite communications based on radio frequencies (RF). Although high throughput is a very prominent advantage, also the advantage of low-power, low interference and high security for optical wavelengths, e.g. 1064 or 1550 nm .
What is an optical satellite communication?
Rather than microwave radio, the satellites use lasers, which are properly called “free space optical” in technical parlance.
“Free space optical” (FSO) separates them from fiber optic cables, which also use lasers, but confined to a transparent fiber.
Here I am in 2003 with some FSO equipment testing its use as one possible means to recover from communications failures in Washington DC and elsewhere, should it become necessary. We are on the rooftops of various Department of Justice buildings in Washington DC.
Imagine this type of equipment manufactured today and shrunk to fit a satellite. Aiming is still critical - note our use of telescopes.
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