Optical amplifier system generating high optical output level

摘要

An optical amplifier system includes a branching filter for branching into respective wavelengths a wavelength-multiplexed incident light having wavelengths lambda 1 to lambda n, which is inputted from an input port. N optical amplifier sections respectively amplify the branched lights of respective wavelengths. An optical multiplexer multiplexes the amplified lights having the wavelengths lambda 1 to lambda n before outputting the light to an output port. An output control circuit sets the output level of the optical amplifier section to an arbitrary value. With this composition, the present invention is capable of increasing the optical output level per wavelength, independently of the wavelength multiplex number n, when a light signal having n wavelengths is to be amplified.