Fiber Optics

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Diodes). Each of these methods create a
highly focused beam of light that is cycled on and off at very high speeds.
Computers at the transmitting end convert data or voice into "bits" of
information. The information is then sent through the fiber by the presence, or
lack, of light. So, all of the data is sent light pulses. Computers on the
receiving end convert the light back into data or voice, so it can be used.

All of this seems to be a very "modern" concept, and the technology we use
is. The concept though, was the idea of Alexander Graham Bell in the late 1800's.
He just didn't have a dependable light source... some days the sun doesn't
shine! He thought of the idea that our voices could be transmitted by pulses of
light. The people who thought that audio, video, and other forms of data could
be transmitted by light through cables, were present day scientists. Most of
the things that are possible today, Alexander Grahm Bell could never even have
dreamed ...

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