Author Affiliations
Abstract
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, China
To extensively deploy quantum key distribution (QKD) systems, copropagating with classical channels on the same fiber using wavelength division multiplexing (WDM) technology becomes a critical issue. We propose a user-based channel-interleaving WDM scheme with unequal frequency spacing (UFS-iWDM) to reduce the impairment on the quantum channels induced by four-wave mixing (FWM), and theoretically analyze its impact on quantum bit error rate (QBER). Numerical simulation results show that a UFS-iWDM can significantly reduce the FWM noise and improve QBER compared with the corresponding WDM scheme with equal frequency spacing (EFS), especially in the case of nonzero dispersion shifted fiber.
270.5565 Quantum communications 060.2330 Fiber optics communications 060.4510 Optical communications Chinese Optics Letters
2016, 14(6): 060602
北京邮电大学 信息与通信工程学院 信息光子学与光通信国家重点实验室, 北京 100876
为了向用户提供差异化的密钥服务，研究了配备密钥池的可信任量子密钥分配网络.首先，理论分析了数据包时延和密钥池的关系，给出了具体关系式，指出带有密钥池缓存功能的量子密钥分配网络的平均数据包时延与密钥产生速率、密钥池的初始密钥长度、以及数据包的平均长度、到达时间和到达率密切相关.对比理论分析和软件仿真结果，验证了时延分析的正确性.其次，将密钥提供服务分为三类：保证提供型、优先提供型和尽力提供型，并提出了相应的技术实现方案，即提前预约、逐跳插队和逐跳排队；最后，仿真结果表明差异化密钥服务提供机制是有效的.
量子密钥分配 差异化服务提供 提前预约 逐跳插队 逐跳排队 Quantum key distribution Differentialized service providing Prereserving Hopbyhop jumpingqueue Hopbyhop queuing
Author Affiliations
Abstract
Key Laboratory of Information Photonics and Optical Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
We introduce a novel network-coding scheme that can be implemented in all-optical multicast networks. A simple and successful module based on the all-optical XOR gate is designed to realize the network coding scheme. The module is a key hardware component in realizing the proposed scheme. The working principle and the experimental results of the module are also presented. Experimental results show that the function of the module is sufficient in satisfying the requirements of the proposed network coding scheme.
网络编码 全光异或门 光组播网络 060.4510 Optical communications 200.4560 Optical data processing 200.3760 Logic-based optical processing Chinese Optics Letters
2010, 8(8): 753
Author Affiliations
Abstract
Key Laboratory of Optical Communications and Lightwave Technologies, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
Different multicasting schemes in optical packet switched networks are discussed, including the parallel mode, serial mode, and hybrid mode multicasting schemes. Simulated modeling technique is applied to compare the network-level performance of the three multicasting schemes. A conclusion can be drawn from the results that since the hybrid-mode multicasting scheme can increase the multicast success ratio and reduce the packet retransmission times compared with the other two schemes, it is the best choice for delivering multicasting sessions in the optical packet switched networks.
光通信 分组交换网 组播 060.4510 Optical communications 060.4259 Networks, packet-switched 060.4255 Networks, multicast Chinese Optics Letters
2009, 7(11): 983
