29 May 2013 Gigahertz-gated InGaAs SPAD system with avalanche charge sensitivity approaching the fundamental limit
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Abstract
We present an InGaAs/InP single-photon detection system operating at 1.25 GHz with detection efficiency above 50 % and per-gate afterpulse probability, measured 24.8 ns after an avalanche, below 0.2 %. The high efficiency and low afterpulse probabilities we observe are achieved with an avalanche discrimination system whose threshold for detection approaches the fundamental limit imposed by Johnson noise on a 50 Ohm load; we measure the threshold to be less than 8 fC. We discuss the design and performance of our approach, and tradeoffs between detection efficiency, afterpulse probability, and maximum count rate.
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Alessandro Restelli, Joshua C. Bienfang, Alan L. Migdall, "Gigahertz-gated InGaAs SPAD system with avalanche charge sensitivity approaching the fundamental limit ", Proc. SPIE 8727, Advanced Photon Counting Techniques VII, 87270F (29 May 2013); doi: 10.1117/12.2016087; https://doi.org/10.1117/12.2016087
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