Patent ID: 6885499

Claim:
An optical amplifying apparatus comprising: at least two mutually exclusive wavelength bands, each having at least two channels; a plurality of optical adjusting means provided for the respective wavelength bands, for adjusting average optical power per single wavelength channel of light beams, and wavelengths of the respective wavelength bands having approximately equal channel powers; wavelength-multiplexing means for wavelength multiplexing outputs of said respective optical adjusting means; and controlling means for performing control so that an output of optical adjusting means for adjusting average optical power per single wavelength channel of shorter-wavelength-band light among said plurality of optical adjusting means becomes larger than an output of optical adjusting means for adjusting average optical power per single wavelength channel of longer-wavelength-band light among said plurality of optical adjusting means, and approximate channel powers of the shorter wavelength band light is greater than approximate channel powers of the longer wavelength band light.