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High-performance superconductor nanowire single-photon detectors (SNSPDs) coupled by 50- $\mu\hbox{m}$ multimode fiber were designed and fabricated for the purpose of space applications. Microlens coupling between multimode fiber and detector chip was proposed, resulting in coupling efficiency of 86% at the chips with detection area of $15\times 15\ \mu\hbox{m}^{2}$. An optical structure for enhancing...
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