Journal
OPTICS EXPRESS
Volume 19, Issue 10, Pages 9102-9110Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.009102
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Funding
- NIST Quantum Information Initiative
- Albion College Faculty
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We present a compact packaging technique for coupling light from a single-mode telecommunication fiber to cryogenic single-photon sensitive devices. Our single-photon detectors are superconducting transition-edge sensors (TESs) with a collection area only a factor of a few larger than the area of the fiber core which presents significant challenges to low-loss fiber-to-detector coupling. The coupling method presented here has low loss, cryogenic compatibility, easy and reproducible assembly and low component cost. The system efficiency of the packaged single-photon counting detectors is verified by the triplet method of power-source calibration along with the multiple attenuator method that produces a calibrated single-photon flux. These calibration techniques, when used in combination with through-wafer imaging and fiber back-reflection measurements, give us confidence that we have achieved coupling losses below 1 % for all devices packaged according to the self-alignment method presented in this paper.
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