Patent ID: 8160404

Claim:
An optoelectronic device on Si or SOT wafer comprising: a substrate; an on-chip input waveguide structure that receives an input optical signal; a GeSi/Si waveguide structure having a GeSi absorption region which is in contact with and directly butt-coupled to said on-chip input waveguide, said GeSi/Si waveguide structure receives the input optical signal and performs optical modulation at reverse bias on the input optical signal based on Franz-Keldysh effect, the GeSi/Si waveguide structure outputs an output optical signal associated with the optical modulation operations performed on said input optical signal; an on-chip output waveguide structure that is directly butt-coupled to and in contact with said GeSi absorption region, receives the output optical signal and provides said optical output signal for further processing, said on-chip input waveguide structure and said on-chip output waveguide structure each having a first dielectric layer, said first dielectric layers being directly positioned on said substrate, said on-chip input waveguide structure and said on-chip output waveguide structure each comprising a core being directly positioned on said first dielectric layers and a second dielectric layer being directly positioned on said on-chip input waveguide structure and said on-chip output waveguide structure; and a first doped semiconductor layer having a selective doping type positioned on the GeSi absorption region and a second doped semiconductor layer positioned on another side of said GeSi absorption region having an opposite doping type from said selective doping type to allow electric fields to be applied to the GeSi absorption region at reverse bias; wherein said first doped semiconductor layer being directly positioned on said substrate, said GeSi absorption region being directly positioned on said first doped semiconductor layer and said second semiconductor layer being directly positioned on said GeSi absorption region.