Zhang Liuming, Hajomer Adnan A E, Yang Xuelin, Hu Weisheng
Opt Express. 2019 Sep 30;27(20):29207-29216. doi: 10.1364/OE.27.029207.
This paper proposes and experimentally demonstrates an error-free secure key generation and distribution (SKGD) scheme in classical optical fiber link by exploiting Stokes parameters (SPs) of the state of polarization (SOP). Due to the unique birefringence distribution of the optical fiber channel, random but high-correlated SPs are shared between Alice and Bob. The dynamic SPs are also affected by the time-varying environmental factors, providing the source of randomness for the secret key extraction. As a proof of concept, key generation rate (KGR) of 213-bits/s is successfully demonstrated over 25-km standard single-mode fiber (SSMF). The error-free SKGD is realized in fiber channel using the information reconciliation (IR) technology, where Bose-Chaudhuri-Hocquenghem (BCH) codes are applied. Due to the channel uniqueness and the high-sensitivity to the initial SOP of optical signals, high-level security is provided by the proposed scheme, which is analyzed and verified against the possible fiber-tapping attacks. Moreover, the proposed SKGD scheme offers additional benefits such as simple structure, low cost, and suitablity for long-haul transmission.
本文提出并通过利用偏振态（SOP）的斯托克斯参数（SPs），在经典光纤链路中实验演示了一种无差错的安全密钥生成与分发（SKGD）方案。由于光纤信道独特的双折射分布，爱丽丝和鲍勃之间共享随机但高度相关的SPs。动态SPs还受时变环境因素影响，为密钥提取提供了随机性来源。作为概念验证，在25公里标准单模光纤（SSMF）上成功演示了213比特/秒的密钥生成率（KGR）。利用信息协调（IR）技术在光纤信道中实现了无差错的SKGD，其中应用了博斯-乔杜里-霍克文黑姆（BCH）码。由于信道的独特性以及对光信号初始SOP的高灵敏度，所提方案提供了高级别的安全性，并针对可能的光纤窃听攻击进行了分析和验证。此外，所提的SKGD方案还具有结构简单、成本低以及适合长距离传输等额外优点。
