Virgil,

Fiber Optics is used for the transmission of signals as far as I know of.

A LED or a Laser that is controlled by Electronics sends pulses of light through a Glass Fiber that is 'received' by a photodiode at the other end that converts the pulses of light back into a copy of the original Electronic signal.

Look here for some training info:
http://www.cableu.net/vho/

Bill

[This message has been edited by Bill Addiss (edited 05-10-2002).]

Bill