The FD50 Series from Fermionics Opto-Technology is a Photodiode with Wavelength Range 1300 to 1550 nm, Capacitance 0.25 to 0.4 pF, Dark Current 0.1 to 1 nA, Responsivity/Photosensitivity 0.8 to 0.90 A/W, Rise Time 100 to 200 ps. More details for FD50 Series can be seen below.