The PDI-20-P20-20G-W from LasersCom is a Photodiode with Wavelength Range 1100 to 1650 nm, Bandwidth 20 to 22 GHz, Capacitance 0.11 to 0.15 pF, Dark Current 25 to 50 nA, Responsivity/Photosensitivity 0.5 to 0.55 A/W. More details for PDI-20-P20-20G-W can be seen below.