Quantum efficiency measurement of single photon detectors using photon pairs generated in optical fibers
Xiaoying Li, Xiaoxin Ma, Limei Quan, Lei Yang, Liang Cui, Xueshi, Guo
TL;DR
This paper presents a method to measure the quantum efficiency of single photon detectors using correlated photon pairs generated in optical fibers, emphasizing the importance of collection efficiency and spectral properties.
Contribution
It introduces a technique to accurately determine detector efficiency by characterizing photon pair collection efficiency with spectral dependence analysis.
Findings
Quantum efficiency measured using photon pairs with different bandwidths.
Collection efficiency depends on the spectral properties of photon pairs.
Method improves accuracy of quantum efficiency estimation.
Abstract
Using the correlated signal and idler photon pairs generated in a dispersion shifted fiber by a pulsed pump, we measure the quantum efficiency of a InGaAs/InP avalanche photodiode-based single photon detector. Since the collection efficiency of photon pairs is a key parameter to correctly deduce the quantum efficiency, we carefully characterize the collection efficiency by studying correlation dependence of photon pairs upon the spectra of pump, signal and idler photons. This study allows us to obtain quantum efficiency of the single photon detector by using photon pairs with various kinds of bandwidths.
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