InP/InGaAs uni-travelling-carrier photodiode with 220 GHz bandwidth

Abstract
An InP/InGaAs uni-travelling-carrier photodiode with a record 3 dB bandwidth of 220 GHz at a wavelength of 1.55 µm has been fabricated. The estimated average electron velocity in the depletion region is > 2.3 × 107 cm/s, which indicates that non-equilibrium electron transport is taking place in the collection layer.