| Abstract: | Quasi-phase matched (QPM), semiconductor photonic waveguides include
periodically-poled alternating first and second sections. The first
sections exhibit a high degree of optical coupling (abbreviated
"X.sup.2"), while the second sections have a low X.sup.2. The alternating
first and second sections may comprise high-strain and low-strain
sections made of different material states (such as crystalline and
amorphous material states) that exhibit high and low X.sup.2 properties
when formed on a particular substrate, and/or strained corrugated
sections of different widths. The QPM semiconductor waveguides may be
implemented as silicon-on-insulator (SOI), or germanium-on-silicon
structures compatible with standard CMOS processes, or as
silicon-on-sapphire (SOS) structures. |