发明名称 |
Characterization of single-photon detectors using a continuous wave laser source |
摘要 |
Operational parameters of a single-photon detector are determined with a continuous wave laser source. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by using a wide-range variable attenuator to attenuate the optical power of the continuous wave laser. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship. |
申请公布号 |
US9068881(B2) |
申请公布日期 |
2015.06.30 |
申请号 |
US201012834956 |
申请日期 |
2010.07.13 |
申请人 |
AT&T Intelletual Property I, L.P. |
发明人 |
Brodsky Michael;Antonelli Cristian;Oh Jungmi |
分类号 |
G06F17/18;G01J1/08;G01J1/42 |
主分类号 |
G06F17/18 |
代理机构 |
Chiesa Shahinian & Giantomasi PC |
代理人 |
Chiesa Shahinian & Giantomasi PC |
主权项 |
1. A method for characterizing a single-photon detector operating with a plurality of trigger rates, the method comprising:
for each of the plurality of trigger rates:
recording, by a processor, dark counts with the single-photon detector and computing a dark count probability; andfor each of a plurality of optical powers generated by a continuous wave laser,
recording, by the processor, counts with the single-photon detector and computing a count probability;calculating, by the processor, a single-photon detector operational parameter based on the dark count probability and the count probability, wherein the count probability is derived from evaluating a probability of an afterpulse at a predetermined time interval; andfitting, by the processor, the dark count probability and the count probability for a user-defined relationship, wherein the user-defined relationship comprises a probability of detecting photons generated by a specific source in an absence of dark counts and afterpulses, an average number of photons per detector gate and a trigger rate, wherein the probability of detecting photons generated by the specific source in the absence of dark counts is exponentially related to the average number of photons per detector gate. |
地址 |
Atlanta GA US |