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A sine-gated single-photon detector (SPD) intended for use in a quantum keydistribution (QKD) system is considered in this paper. An "avalanche delay"effect in the sine-gated SPD is revealed. This effect consists in theappearance of an avalanche triggered at the next gate after the photon arrivalgate. It has been determined experimentally that the nature of this effect isnot related to the known effects of afterpulsing or charge persistence. Thiseffect negatively affects the overall error rate in the QKD system. Theinfluence of the main detector control parameters, such as temperature, gateamplitude and comparator's threshold voltage, on the avalanche delay effect wasexperimentally established.

The avalanche delay effect in sine-gated single-photon detector based on InGaAs/InP SPADs