Abhay M. Joshi & Xinde Wang
Discovery Semiconductors, Inc.
119 Silvia Street
Ewing, New Jersey, 08628 USA
Discovery Semiconductors has developed 50 GHz "Dual-depletion InGaAs/InP Photodiodes". The PIN operates at -3V reverse bias and has minimum responsivity of 0.7 A/W at 1.3 and 1.55 um wavelength. The Ripple Factor is less than +/- 1 dB for a wide band of frequencies, DC to 50 GHz. The salient feature of the PIN is an on-chip coplanar waveguide output for proper impedance matching. The PIN exhibits group delay of less than +/- 20 psec across the entire bandwidth. Discovery Semiconductors has also designed 50 GHz InGaAs PIN / p-HEMT Amplifier Photoreceiver Opto-electronic Integrated Circuit (OEIC) with a voltage conversion gain of 60 V/W at 1550 nm. The Photoreceiver OEIC exhibits an electric back reflection (S22) of less than -10 dB across the entire 50 GHz bandwidth. The optical back reflection is better than -30 dB at 1300 and 1550 nm.
Keywords: InGaAs Photodiodes, Photoreceivers, Wide Bandwidth, OEIC, InP p-HEMT.