Monolithic pin -HEMT 1.55 µm photoreceiveron InP with 27 GHz bandwidth

Abstract
A monolithically integrated photoreceiver is presented, based on a new integration concept comprising a waveguide integrated photodiode and a travelling wave GaInAs/AlInAs-HEMT amplifier. A record 3 dB bandwidth of 27 GHz is measured and a clearly open eye is obtained for a 20 Gbit/s pseudo-random bit stream. This high speed performance was achieved with photolithographically defined 0.7 µm gate length HEMTs, regrown by MBE on semi-insulating GaInAsP waveguide layers.