作为云计算的基础设施和下一代网络技术的创新平台,数据中心网络的研究成为了近年来学术界和工业界关注的热点.文中围绕数据中心网络研究的基本问题,介绍了国际国内的研究现状,包括数据中心网络拓扑设计、传输协议、无线通信、增强以太网、虚拟化、节能机制和软件定义网络(Software Defined Networking,SDN)等,并展望了数据中心网络的发展趋势.
A new receiver is proposed, which uses the fiber optical parametric amplifier(FOPA) in optical code division multiple access(OCDMA) over free space optic(FSO) communication system. The noise tolerance as the performance index in this receiver is derived. The receiver can not only improve the noise tolerance but also change the pump data conveniently for adapting to the length variation of the coding sequence under a complex and fast-changing weather condition. The influence of different factors on the noise tolerance is analyzed, and a significant improvement of about 18.77 d B for the noise tolerance can be achieved when the pump power and the length of coding sequence are 5 W and 256, respectively.
