Hybrid OCS/OBS interconnect in intra-data-center network

We report on a data center network(DCN) architecture based on hybrid optical circuit switching(OCS) and optical burst switching(OBS) interconnect for dynamic DCN connectivity provisioning. With the combination of the centralized and distributed control of the software-defined optical networks, the proposed interconnect can achieve unprecedented flexibility in dealing with both mice and elephant flow in the DCN. Numerical simulation is employed to investigate the performance of the proposed architecture. The results show that the OBS module has preferable performance in dealing with a larger burst packet, and the throughput is constrained by the capacity of the server random access memory module.     

改进型蜂巢晶格结构光子晶体光纤的色散与非线性特性

结合蜂巢晶格与不同空气孔直径晶格二者的优势,提出一种改进犁蜂巢晶格结构光子晶体光纤,采用矢量光束传输法对该光纤的色散与非线性特性进行了数值模拟,分析了色散、非线性系数与其晶格参量之间的关系.数值结果表明,该光纤在1.2～1.6 μm波段内可以实现大负色散、色散平坦、正色散等多种色散特性;此外,晶格结构中空气孔直径的减小...     

变分模态分解-排列熵方法用于分布式光纤振动传感系统去噪

提出一种变分模态分解-排列熵的去噪方法,分析并设定排列熵中关键参数和阈值,进而通过排列熵来确定变分模态分解的分解层数值,将分解的各模态进行重构以实现对振动信号的去噪。通过仿真测试来验证该方法在正交性、完备性、信噪比和效率方面的优越性,最后对系统采集的实际振动信号进行去噪处理。实验结果表明,与现有的经验模态分解-相关系数和完全经验模态分解-相关系数方法相比,所提方法对触网、车轮碾压和雨淋三种振动信号具有最优的去噪信噪比(含噪信号与降噪值之比),分别为32.5358 dB、30.5546 dB和29.3435 dB,耗时也较少,分别为1.4432,1.6320,1.2349 s,信号模式识别准确率最高,均在99%以上。