FOUR-WAVE-MIXING BASED OPTICAL WAVELENGTH CONVERTER DEVICE

Wavelength converter device (100), for generating a converted radiation at frequency Omega>g< through interaction between at least one signal radiation at frequency Omega>g< and at least one pump radiation at frequency Omega>g,< comprising * an input (1) for said at least one signal radiation at frequency Omega>g; < * a pump light source (3) for generating said at least one pump radiation at frequency Omega>g; < * an output (2) for taking out said converted radiation at frequency Omega>g; < * a structure (4) for transmitting said signal radiation, said structure (4) including one optical resonator (10) comprising a non-linear material, having an optical length of at least 40* eta /2, wavelength eta is the wavelength of the pump radiation, and resonating at the pump, signal and converted frequencies Omega>p,< OMEGA>s< AND OMEGA>g, < characterized in that said structure (4) comprises a further optical resonator (20) coupled in series to said optical resonator (10), said further optical resonator (20) comprising a non-linear material, having an optical length of at least 40* eta /2, wherein eta is the wavelength of the pump radiation, and resonating at the pump, signal and converted Omega>p,< OMEGA>s< AND OMEGA>g; < wherein by propagating through said structure (4) the pump and signal radiation generate said converted radiation by non-linear interaction within said optical resonators (10, 20).