Optical amplifier and optical communication system provided with

Details Optical amplifier and optical communication system provided with Optical amplifier and optical communication system provided with

1994-02-01

1996-08-13

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359134, 359160, 359341, 372 6, H04B 1016, H04B 1000

Patent

active

055462138

ABSTRACT:
An optical communication system transmits information with a pumping light beam acting as the carrier, and with a signal light beam. This optical communication system includes an optical fiber amplifier adapted to amplify the signal light beam by having the signal light beam and the pumping light beam propagate through a rare-earth-doped fiber doped with a rare-earth element. A modulating circuit modulates the pumping light beam with a high-frequency modulating signal having a period shorter than the life span of fluorescence resulting from an excited state. When the signal light beam and the pumping light beam are propagated in the same direction through the rare-earth-doped fiber, the transmission of information with the pumping light beam acting as the carrier, can provide transmission of a supervisory signal for an optical repeater. When the signal light beam and the pumping light beam are propagated in opposite directions through the rare-earth-doped fiber, a two-way transmission can be achieved by the transmission of information with the signal light beam and the transmission of information with the pumping light beam.

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