Optical amplification apparatus having function of flattening channel output spectrum

摘要

An optical amplification apparatus having a function of flattening a channel output spectrum is provided. The optical amplification apparatus includes an optical amplifier amplifying an input optical signal and outputting an output optical signal; a pump unit pumping the input optical signal at a front and a back of the optical amplifier; a first detection unit selecting a plurality of particular channels with respect to a separated part of the input optical signal to be input to an input terminal of the optical amplifier and converting an input optical signal in each of the selected channels into an electrical signal; a second detection unit selecting the same channels as the plurality of particular channels selected by the first detection unit with respect to a separated part of the output optical signal output from an output terminal of the optical amplifier and converting an output optical signal in each of the selected channels into an electrical signal; and a controller receiving electrical signals respectively in the selected channels from the first and second detection units, determining whether an optical signal gain for each of the particular channels has changed, and controlling a current provided to the pump unit according to the change in the optical signal gain, thereby accomplishing automatic gain control (AGC) and automatic level control (ALC) and maintaining a flatness of a wavelength division multiplexing (WDM) output.