The detection sensitivity (DS) of the commercial single-photon-receiver based on InGaAs gate-mode avalanche photodiode is estimated. Instalment of a digital-blanking-system (DBS) to reduce dark current makes the difference between DS, which is an efficiency of the detector during its open-gate/active state, and the total/overall detection efficiency (DE). By numerical simulations, it is found that the average number of light-pulses, blanked by DBS, following a registered pulse is 0.333. DS is estimated at 0.216, which can be used for estimating DE for an arbitrary photon arriving rate and a gating frequency of the receiver.
@article{arxiv.0901.0525,
title = {Derivation of sensitivity of a Geiger mode APDs detector from a given efficiency for QKD experiments},
author = {Kiyotaka Hammura and David Williams},
journal= {arXiv preprint arXiv:0901.0525},
year = {2009}
}