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Proceedings Paper

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

Paper Details

Date Published: 29 May 2013
PDF: 8 pages
Proc. SPIE 8727, Advanced Photon Counting Techniques VII, 87270F (29 May 2013); doi: 10.1117/12.2016087
Show Author Affiliations
Alessandro Restelli, Joint Quantum Institute (United States)
Joshua C. Bienfang, Joint Quantum Institute (United States)
National Institute of Standards and Technology (United States)
Alan L. Migdall, Joint Quantum Institute (United States)
National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 8727:
Advanced Photon Counting Techniques VII
Mark A. Itzler; Joe C. Campbell, Editor(s)

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