This CX-1x1-SFP module is optical wavelength converter with ability to convert from two fiber multimode signals to two fiber singlemode signals and vise versa. Also, conversion from two fiber to one fiber system and inversely are applicable. System is employing the industry standard Small Form Pluggable (SFP) optical device. Singlemode, multimode or CWDM wavelength selected by simply plugging in the appropriate SFP module.