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

OPTICS COMMUNICATIONS

卷:441

Article

Liang, Long-Yue^1,2  Liang, Jun-Sheng²  Yao, Quan¹  Zheng, Ming-Yang^1,3  Xie, Xiu-Ping^1,3  Liu, Hong²  Zhang, Qiang^1,4,5  Pan, Jian-Wei^4,5 

[1] Jinan Inst Quantum Technol, Jinan 250101, Shandong, Peoples R China

[2] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China

[3] Shandong Inst Quantum Sci & Technol Co Ltd, Jinan 250101, Shandong, Peoples R China

[4] Univ Sci & Technol China, Natl Lab Phys Sci, Microscale, Hefei 230026, Anhui, Peoples R China

[5] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

关键词: Polarization-independent;    Single-photon detector;    Up-conversion;    Periodically poled lithium niobate waveguide;   

DOI  :  10.1016/j.optcom.2019.02.057

来源: Elsevier

【 摘 要 】

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 mu m 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.

【 授权许可】

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