Intensity fluctuation of a gain-switched semiconductor laser for quantum key distribution systems

被引：20

作者：

Nakata, Kensuke ^{[1
]}

Tomita, Akihisa ^{[1
]}

Fujiwara, Mikio ^{[2
]}

Yoshino, Ken-ichiro ^{[3
]}

Tajima, Akio ^{[3
]}

Okamoto, Atsushi ^{[1
]}

Ogawa, Kazuhisa ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Informat Sci & Technol, Sapporo, Hokkaido 0600814, Japan

[2] Natl Inst Informat & Commun Technol, Quantum ICT Adv Dev Ctr, Koganei, Tokyo 1848795, Japan

[3] NEC Corp Ltd, IoT Devices Res Labs, Kawasaki, Kanagawa 2118666, Japan

来源：

OPTICS EXPRESS | 2017年 / 25卷 / 02期

关键词：

COMMUNICATION; SECURITY; STATES; FIELD;

D O I：

10.1364/OE.25.000622

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Security certification of quantum key distribution (QKD) systems under practical conditions is necessary for social deployment. This article focused on the transmitter, and, in particular, investigated the intensity fluctuation of the optical pulses emitted by a gain-switched semiconductor laser used in QKD systems implementing decoy-BB84 protocol. A large intensity fluctuation was observed for low excitation, showing strong negative correlation between the adjacent pulses, which would affect the final key rate. The fluctuation decreased and the correlation disappeared as excitation increased. Simulation with rate equations successfully reproduced the experimental results and revealed that the large fluctuation originates from an intrinsic instability of gain-switched lasers driven periodically at a rate comparable to the inverse of carrier lifetime, as in GHz-clock QKD systems. Methods for further reduction of the intensity fluctuation were also discussed. (C) 2017 Optical Society of America

引用

页码：622 / 634

页数：13

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