Optimization of hybrid PZT/Si electro-optic phase modulators

Pure phase modulators are key building blocks for Photonic Integrated Circuits (PICs). Si modulators based on plasma dispersion suffer from spurious amplitude modulation and high insertion losses. Thin-film electro-optic devices relying on the Pockels effect have therefore been proposed as an ideal alternative for phase modulators on Si. Strongly electro-optic thin films of ferro-electric Lead Zirconate Titanate (PZT) grown on Si waveguides allow for Hybrid PZT/Si phase modulators. We present here simulation studies of a co-planar TE/TM modulator structure.