The PDI-40-P40-4G-K from LasersCom is a Photodiode with Wavelength Range 850 to 1700 nm, Bandwidth 4 GHz, Capacitance 0.35 to 0.8 pF, Dark Current 0.02 to 0.08 nA, Responsivity/Photosensitivity 0.8 to 0.85 A/W. More details for PDI-40-P40-4G-K can be seen below.