High frequency saturation measurements of an InGaAs/InP waveguide photodetector

The high frequency saturation characteristics of an InGaAs/InP waveguide pin photodetector are measured. At a wavelength of 1.3 μm, the detector has a responsivity of 0.5 A/W and a flat frequency response from 800 MHz to 20 GHz. With a bias of −4 V, the normalised frequency response of the detector remains unchanged when optical powers up to l0 mW are incident on the detector.