Importance

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Abstract

An optical communication system for obtaining transmission of information with a pumping light beam acting as carrier, in addition to transmission of information with a signal light beam. This optical communication system includes an optical fiber amplifier amplifying a signal light beam by having the signal light beam and a pumping light beam propagated through a rare-earth-doped fiber, and a modulating circuit for modulating 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 a carrier constitutes a transmission of a supervisory signal for an optical repeater, and when the signal light beam and the pumping light beam are propagated in directions opposite to each other through the rare-earth-doped fiber, a two-way transmission is 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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First Claim