Patent ID: 8031394

Claim:
A wavelength conversion system, comprising: a Mach-Zehnder interferometer including two optical waveguides; a first non-linear medium, in which a third-order non-linear phenomenon occurs such that wavelength conversion is performed using four wave mixing, provided on one of the two optical waveguides; and a second non-linear medium, in which a third-order non-linear phenomenon occurs such that wavelength conversion is performed using four wave mixing, provided on the other one of the two optical waveguides and having a non-linear susceptibility different from that of said first non-linear medium; multiplexed light produced by multiplexing signal light and pumping light being branched and introduced into the two optical waveguides such that said first and second non-linear media individually generate phase conjugation light of the signal light with different intensity and the light guided through the one optical waveguide and the light guided through the other one of the two optical waveguides interfere with each other so that the phase conjugation light is extracted as wavelength conversion light according to the difference of the intensity between the phase conjugation lights from said first and second non-linear mediums.