Multi-gigahertz operation of photon counting InGaAs avalanche photodiodes

Yuan, Z. L.; Sharpe, A. W.; Dynes, J. F.; Dixon, A. R.; Shields, A. J.
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p071101
Academic Journal
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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