High bandwidth-efficiency long-wavelength PIN photodiodes

A new drift-enhanced dual-absorption photodetector design that achieves a high bandwidth-efficiency product is reported. Photodetectors fabricated using this design achieved bandwidths of 30 GHz at 1.55 /spl mu/m with a responsivity of 0.82 A/W for a bandwidth-efficiency product of 19.7 GHz. This design appears promising for allowing simple vertically-illuminated photodetectors to be applied in high-speed, high-sensitivity systems.