WAVELENGTH MULTIPLEX OPTICAL TRANSMISSION SYSTEM, WAVELENGTH MULTIPLEX OPTICAL TRANSMISSION APPARATUS, WAVELENGTH MULTIPLEX OPTICAL RECEPTION APPARATUS, AND OPTICAL RELAYING APPARATUS

PROBLEM TO BE SOLVED: To provide a wavelength multiplex optical transmission system or the like for reducing the effect of an interference wave due to the mixing of four optical waves in an optical fiber while effectively utilizing optical bands. SOLUTION: The wavelength multiplex optical transmission system sets the greater intensity of an optical signal with a wavelength wherein an interference wave by the mixing of the four optical waves is large and the smaller intensity of an optical signal with a wavelength wherein the interference wave by the mixing of the four optical waves is small so as to alleviate deterioration in the dynamic range due to the mixing of the four optical waves while optical frequencies of the optical signals in the wavelength multiplex optical transmission system are arranged at equal intervals. COPYRIGHT: (C)2005,JPO&NCIPI