The LAPD 1550-50R from OSI Laser Diode, Inc. is a Photodiode with Wavelength Range 1550 nm, Bandwidth 1.8 to 2.5 GHz, Capacitance 0.5 to 0.7 pF, Dark Current 1 to 25 nA, Responsivity/Photosensitivity 0.9 to 9 A/W. More details for LAPD 1550-50R can be seen below.