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arXiv · 1903.05814

Compact all-fiber polarization-independent up-conversion single-photon detector

Long-Yue Liang·Jun-Sheng Liang·Quan Yao·Ming-Yang Zheng·Xiu-Ping Xie·Hong Liu·Qiang Zhang·Jian-Wei Pan
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Abstract

We demonstrate a compact all-fiber polarization-independent up-conversion single-photon detector based on integrated reverse proton exchanged periodically poled lithium niobate waveguides. The horizontally and vertically polarized components of randomly polarized signals are separated with a fiber-coupled polarization beam splitter, launched into two orthogonally polarized polarization maintaining fibers and fetched into two adjacent independent waveguides on the same device. The up-converted outputs from both waveguide channels are then combined with a multi-mode fiber combiner and detected by a silicon detector. With this configuration, the polarization-independent single-photon counting at 1.55 um is achieved with a system detection efficiency of 29.3%, a dark count rate of 1600 counts per second, and a polarization dependent loss of 0.1dB. This compact all-fiber system is robust and has great application potential in practical quantum key distribution systems.

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Long-Yue Liang, Jun-Sheng Liang, Quan Yao, Ming-Yang Zheng, Xiu-Ping Xie, Hong Liu, Qiang Zhang, Jian-Wei Pan. 2019-03-14. Compact all-fiber polarization-independent up-conversion single-photon detector. https://doi.org/10.1016/j.optcom.2019.02.057

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