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Gated InGaAs Detector Characterization with Sub-Picosecond Weak Coherent Pulses

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arxiv 2106.05599 v3 pith:XG6XFPHN submitted 2021-06-10 quant-ph physics.ins-det

classification quant-phphysics.ins-det
keywords detectorgateafterpulsecoherentgatedingaasprobabilitypulses
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We propose and demonstrate a method to characterize a gated InGaAs single-photon detector (SPD). Ultrashort weak coherent pulses, from a mode-locked sub-picosecond pulsed laser, were used to measure photon counts, at varying arrival times relative to the start of the SPD gate voltage. The uneven detection probabilities within the gate window were used to estimate the afterpulse probability with respect to various detector parameters: excess bias, width of gate window and hold-off time. We estimated a lifetime of 2.1 microseconds for the half-life of trapped carriers, using a power-law fit to the decay in afterpulse probability. Finally, we quantify the timing jitter of the SPD using a time to digital converter with a resolution of 55 ps.

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