Patent ID: 7650072

Claim:
An optical apparatus comprising: a first optical amplifying section configured to amplify an input light multiplexed with a plurality of signal lights to output a first amplified light; an optical coupler configured to branch the first amplified light into a first branched light and a second branched light; an optical signal processing section configured to receive the first branched light, and attenuate and control respective power of the signal lights multiplexed in the first branched light, to output a processed light; a first optical switch configured to receive the processed light and the second branched light, and configured to select and output either the processed light or the second branched light; and a second optical amplifying section configured to amplify a light output from the first optical switch to output a second amplified light, wherein the optical signal processing section is configured to adjust respective attenuation amount for the wavelength of the multiplexed signal lights utilizing the first branched light when the first optical switch selects the second branched light.