Gigahertz-gated InGaAs SPAD system with avalanche charge sensitivity approaching the fundamental limit

Alessandro Restelli; Joshua C. Bienfang; Alan L. Migdall

doi:10.1117/12.2016087

29 May 2013 Gigahertz-gated InGaAs SPAD system with avalanche charge sensitivity approaching the fundamental limit

Alessandro Restelli, Joshua C. Bienfang, Alan L. Migdall

Proceedings Volume 8727, Advanced Photon Counting Techniques VII; 87270F (2013) https://doi.org/10.1117/12.2016087
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

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.

Citation Download Citation

Alessandro Restelli, Joshua C. Bienfang, and 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); https://doi.org/10.1117/12.2016087

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