The performance of selected, commercially available InGaAs/InP avalanche ph
otodiodes operating in a photon-counting mode at an incident wavelength of
1.55 mum is described. A discussion on the optimum operating conditions and
their relationship to the electric field distribution within the device is
presented. (C) 2000 Optical Society of America OCIS codes: 230.0040, 230.5
170, 230.5160, 270.5290.