High speed single photon detection in the near-infrared

Details High speed single photon detection in the near-infrared High speed single photon detection in the near-infrared

2007-07-29

arxiv.org/abs/0707.4307v1

Appl. Phys. Lett. 91, 041114(2007)

Physics

Quantum Physics

Scientific paper

10.1063/1.2760135

InGaAs avalanche photodiodes (APDs) are convenient for single photon detection in the near-infrared (NIR) including the fibre communication bands (1.31/1.55 $\mu$m). However, to suppress afterpulse noise due to trapped avalanche charge, they must be gated with MHz repetition frequencies, thereby severely limiting the count rate in NIR applications. Here we show gating frequencies for InGaAs-APDs well beyond 1 GHz. Using a self-differencing technique to sense much weaker avalanches, we reduce drastically afterpulse noise. At 1.25 GHz, we obtain a detection efficiency of 10.8% with an afterpulse probability of 6.16%. In addition, the detector features low jitter (55 ps) and a count rate of 100 MHz.

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