We fabricate a two-stage wavelength converter in silicon by cascading a microring wavelength mixer with a five-ring coupled-resonator filter. A p-i-n diode is incorporated into the microring for electronic carrier sweep-out, and micro-heaters are incorporated into the filter for tunability. The generated idler wavelength is effectively separated from the input pump and signal, with nearly 50 dB of suppression. (C) 2014 Optical Society of America -