Multi-gigahertz operation of photon counting InGaAs avalanche photodiodes

Details Multi-gigahertz operation of photon counting InGaAs avalanche photodiodes Multi-gigahertz operation of photon counting InGaAs avalanche photodiodes

2010-01-06

arxiv.org/abs/1001.0934v1

Applied Physics Letters 96, 071101 (2010).

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1063/1.3309698

We report a 2 GHz operation of InGaAs avalanche photodiodes for efficient single photon detection at telecom wavelengths. Employing a self-differencing circuit that incorporates tuneability in both frequency and arm balancing, extremely weak avalanches can now be sensed so as to suppress afterpulsing. The afterpulse probability is characterized as 4.84% and 1.42% for a photon detection efficiency of 23.5% and 11.8%, respectively. The device will further increase the secure bit rate for fiber wavelength quantum key distribution.

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