[sci.crypt] Microwaves and security

aglew@ccvaxa.UUCP (03/12/88)

..> Tapping fiber optics

How long can you send a fiber optic signal without requiring repeaters?
When I was in school it was on the order of 10s of kilometers max;
guessing that it might be up to 1000s by now (can't keep track of everything,
sigh) then every so often you have a repeater that uses some electric
effects that is liable to bugging.

A friend who was working on laser repeaters for a transatlantic cable said
(1) that the power of the repeaters was pretty high, and (2) that they
were fed by power in a wire that ran beside the fibers. The first
makes it easier to bug, the second means that you may be able to detect
sympathetic effects quite a way away from the repeater.

Send mail to reply - I don't get here very often any more.


Andy "Krazy" Glew. Gould CSD-Urbana.    1101 E. University, Urbana, IL 61801   
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