Optical amplifier, method of controlling the output light from the optical amplifier, optical transmission system and method of controlling an optical transmission path cross reference to related application

摘要

A method of controlling an output of an optical amplifier which amplifies a multiplexed light ray propagated through a transmission path in an optical transmission system and which includes a probe light beam and other light beams. The method includes utilizing a rare earth added optical fiber as an optical amplifying medium, monitoring the probe light beam and controlling an output of the probe light beam and outputs of the other light beams amplified by the optical amplifier using a result of the monitoring.