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2005
Journal Article
Titel
Miniaturized waveguide-integrated p-i-n photodetector with 120-GHz bandwidth and high responsivity
Abstract
A low-capacitance waveguide-integrated photodiode on InP with a minimized absorber length is presented. In order to maintain a high quantum efficiency, an optical matching layer exploiting mode beating effects is employed. Its optimization leads to a twofold enhanced external responsivity of 0.5 A/W at 1.55 µm wavelength in accordance with simulation. The reduced p-n junction capacitance enables 3 dB bandwidths up to 120 GHz mainly limited due to carrier transit time effects.