A planar InGaAs PIN/JFET fiber-optic detector

A planar structure monolithic optoelectronic integrated circuit (OEIC), comprising an InGaAs PIN photodiode and an InGaAs junction field effect transistor (JFET), has been developed. A cutoff frequency of 1.3 GHz has been successfully obtained. A low dark-current characteristic has also been obtained by polyimide passivation. Design principle, fabrication procedures, and operation characteristics of the PIN/JFET are described.