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

Published

Author(s)

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

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

Keywords

Single photon detection, Quantum communications, Avalanche Photodiode, Near Infrared.
Created May 29, 2013, Updated November 10, 2018