Patent ID: 6879738

Claim:
An apparatus, comprising: a 2×2 optical coupler disposed in semiconductor material, the 2×2 optical coupler having first and second optical inputs to receive a first optical beam having a first wavelength and a second optical beam having a second wavelength, respectively; first and second waveguides disposed in the semiconductor material coupled to first and second outputs of the 2×2 optical coupler, respectively; first and second Si/SiGe multiple quantum well (MQW) p-i-n diodes disposed in the semiconductor material in the first and second waveguides, respectively; and a Y-branch coupler disposed in the semiconductor material to the first and second waveguides, respectively; such that a signal encoded onto the first optical beam at the first wavelength is encoded onto the second optical beam at the second wavelength is output from the Y-branch coupler.