Extremely-weak avalanche discrimination for gated avalanche photodiode
- Extremely-weak avalanche discrimination for gated avalanche photodiode
- Abdessattar Bouzid; 이민수; 우민기; 김일영; 한상욱; 문성욱
- weak avalanche; discrimination; avalanche photodiode; QKD
- Issue Date
- QCRYPT 2012
- Single photon detectors (SPDs) are the key components for diverse applications, such as integrated circuit testing, optical time domain reflectometry, and quantum key distribution . In the near infrared (NIR), InGaAs/InP single photon avalanche diodes (SPADs) are currently the best choice. SPADs operate above their breakdown voltage (Vbr) in the so-called Geiger mode, in which a single photon can trigger a macroscopic current pulse, providing the ability to accurately sense the arrival at the detector of a single photon. However, for many applications, afterpulsing effect is the most limiting factor for InGaAs/InP SPADs performances [2-3].
In this work, we present a simple and practical scheme for weak avalanche discrimination. The implementation is much easier comparing to other techniques as it does not require any compensation of the APD background signal. In this scheme, the time integral of the avalanche current rather than the APD output peak is monitored to sense the photon detection event. To evaluate the effect of our proposed scheme, we compared the afterpulse probability per gate signal of an InGaAs/InP APD with that of conventional discrimination method. For 25 MHz repetition rate, the overall afterpulse probability was as low as 1.48% and 2.92% at the quantum efficiency of 15.6% and 20.7%, respectively.
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