[linux-elitists] Must have free space lasers!

Mr.Bad mr.bad@pigdog.org
Fri May 4 11:51:44 PDT 2001


>>>>> "BW" == Ben Woodard <ben@valinux.com> writes:

    Me> I'm trying to think of how you'd do laser communication that
    Me> -wasn't- line-of-sight. I mean, unless you don't count mirrors
    Me> as line-of-sight. Can you do atmospheric bounce with lasers?
    Me> Masers?

    BW> The absorbtion of higher frequencies is quite noticable. That
    BW> is why you really can't see that far.

Say that again, to yourself, and determine if you really mean it.

    BW> However, radio goes through buildings and finally short wave
    BW> radio bounces all around the world.

Let me try this again: laser, communication, not line-of-sight. Could
you create a short-wave laser? How big would it be? How would you
encode information into the laser signal? What would happen to that
signal if you were bouncing it off the atmosphere?

    >> I guess if you had a powerful enough laser, eventually anything
    >> that was blocking your line of sight would open up and you'd
    >> have a nice clear path.

    BW> You can use extremly low power if you use spread spectrum.

Spread spectrum... lasers?

~Mr. Bad

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