A semiconductor-based all optical wavelength converter is disclosed. An apparatus according to aspects of the present invention includes an optical waveguide disposed in semiconductor material. An optical pump source is optically coupled to direct an optical pump beam having a first wavelength into the optical waveguide. The optical waveguide is further optically coupled to receive an input optical beam having a second wavelength. The optical waveguide is optically coupled to generate an output optical beam having a third wavelength in response to the optical pump beam and the input optical beam in the optical waveguide. A diode structure is disposed in the optical waveguide. The diode structure includes at least P and N regions. The diode structure is biased to generate an electric field to remove free carriers from an optical path through the optical waveguide generated in response to two photon absorption in the optical waveguide.