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

Abstract

A wavelength conversion apparatus includes: a first demultiplexer wavelength-separating an optical signal having wavelengths of a first band wavelength-multiplexed into n drop signals acquired by wavelength-multiplexing optical signals of predetermined wavelengths and a through signal acquired by wavelength-multiplexing an optical signal of a wavelength being not a target of wavelength conversion; a second demultiplexer demultiplexing optical signals of the predetermined wavelengths included in the n drop signals into optical signals; n wavelength converters wavelength-converting first optical signals of wavelengths included in the optical signals into second optical signals of the second band; n first multiplexers multiplexing the wavelength-converted second optical signals, and outputting n third optical signals; and a multiplexing unit multiplexing and outputting the n third optical signals, an optical signal acquired by wavelength-multiplexing wavelengths of a second band previously wavelength-separated from the wavelength-multiplexed optical signal, and the through signal.