Restelli, A.
, Bienfang, J.
and Migdall, A.
(2013),
Gigahertz-gated InGaAs SPAD system with avalanche charge sensitivity approaching the fundamental limit, SPIE Defense Security Sensing, Baltimore, MD, [online], https://doi.org/10.1117/12.2016087
(Accessed October 24, 2025)
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Gigahertz-gated InGaAs SPAD system with avalanche charge sensitivity approaching the fundamental limit
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Author(s)
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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.Conference Dates
April 29-May 3, 2013
Conference Location
Baltimore, MD
Conference Title
SPIE Defense Security Sensing
Pub Type
Conferences
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Keywords
Single photon detection, Quantum communications, Avalanche Photodiode, Near Infrared.
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Created May 29, 2013, Updated November 10, 2018