Wavelength conversion apparatus, optical transmission apparatus, and wavelength conversion method

An optical transmission apparatus comprising:

• a third demultiplexer configured to wavelength-separate, from a wavelength-multiplexed optical signal including optical signals of a first band and a second band, an optical signal having a plurality of wavelengths of the first band that are wavelength-multiplexed and an optical signal having a plurality of wavelengths of the second band that are wavelength-multiplexed;
• and
• a wavelength conversion apparatus including:
• a first demultiplexer configured to wavelength-separate an optical signal having a plurality of wavelengths of the first band being wavelength-multiplexed, the optical signal being wavelength-separated by the third demultiplexer, into n drop signals acquired by wavelength-multiplexing optical signals having a plurality of predetermined wavelengths to be subjected to wavelength conversion and a through signal acquired by wavelength-multiplexing optical signals having wavelengths not to be subjected to wavelength conversion;
• n second demultiplexers configured to demultiplex optical signals of the plurality of predetermined wavelengths included in the n drop signals into a plurality of optical signals;
• n wavelength converters configured to wavelength-convert first optical signals of wavelengths included in the plurality of optical signals being demultiplexed by the n second demultiplexers into a plurality of second optical signals of the second band;
• n first multiplexers configured to multiplex the plurality of second optical signals after wavelength conversion that are output from the n wavelength converters and output n third optical signals;
• and
• a multiplexing unit configured to multiplex the n third optical signals, an optical signal having a plurality of wavelengths of the second band that are wavelength-multiplexed, the optical signal being wavelength-separated by the third demultiplexer, and the through signal, and output the resultant.

A wavelength conversion method comprising:

• wavelength-separating, by a first demultiplexer, an optical signal having a plurality of wavelengths of a first band that are wavelength-multiplexed, the optical signal being wavelength-separated in advance from a wavelength-multiplexed optical signal including optical signals of the first band and a second band into n drop signals acquired by wavelength-multiplexing optical signals of a plurality of predetermined wavelengths to be subjected to wavelength conversion and a through signal acquired by wavelength-multiplexing optical signals of wavelengths not to be subjected to wavelength conversion;
• demultiplexing, by n second demultiplexers, the optical signals of the plurality of predetermined wavelengths being included in the n drop signals, into a plurality of optical signals;
• wavelength-converting, by n wavelength converters, first optical signals of wavelengths included in the plurality of optical signals being demultiplexed by the n second demultiplexers into a plurality of second optical signals of the second band;
• multiplexing the plurality of second optical signals after wavelength conversion that are output from the n wavelength converters and outputting n third optical signals;
• and
• multiplexing the n third optical signals, an optical signal having a plurality of wavelengths of the second band that are wavelength-multiplexed, the optical signal being wavelength-separated in advance from the wavelength-multiplexed optical signal, and the through signal, and outputting the resultant.