空分复用弹性光网络中串扰感知的虚拟网络映射算法  

Crosstalk-Aware Virtual Network Mapping Algorithm in Space Division Multiplexing Elastic Optical Networks

作　　者：任丹萍 张黎[1,2] 胡劲华 Ren Danping;Zhang Li;Hu Jinhua(Hebei Key Laboratory of Security Protection Information Sensing and Processing,Handan 056038,Hebei,China;School of Information and Electrical Engineering,Hebei University of Engineering,Handan 056038,Hebei,China)

机构地区：[1]河北省安防信息感知与处理重点实验室,河北邯郸056038 [2]河北工程大学信息与电气工程学院,河北邯郸056038

出　　处：《光学学报》2023年第5期31-41,共11页Acta Optica Sinica

基　　金：国家重点研发计划(2018YFF0301004);河北省自然科学基金(F2021402005);国家自然科学基金(6210011890,62071071);河北省高等学校科学技术研究项目(QN2020193);河北省邯郸市科学技术研究与发展计划(21422031288);河北省高等学校科学技术研究项目重点项目(ZD2021019)。

摘　　要：首先设计串扰影响评估方法,动态评估相邻纤芯之间的串扰影响;然后提出空分复用弹性光网络中串扰感知的虚拟网络映射算法。在虚拟节点映射阶段,为了增强虚拟节点与虚拟链路的关联性,采用虚拟节点邻近排序方法。物理节点优先级评估方法考虑节点相邻链路的芯间串扰,达到均衡芯间串扰效果。在虚拟链路映射阶段,设计频谱区域分配方法以减小芯间串扰。仿真结果表明,当负载为100~900 Erlang时,所提算法的平均提升虚拟光网络请求接受率比LCLCVNM算法提高了6.45%,串扰改善了32.1%,但时间复杂度略高于LCLC-VNM算法。Objective In recent years,the rapid increase in network traffic requires more network transmission capacity.Therefore,an elastic optical network based on orthogonal frequency division multiplexing technology is proposed.Its characteristic is to allocate spectrum resources according to the connection requests.By improving the utilization efficiency of spectrum resources in the frequency domain,the network transmission capacity can be expanded.However,restricted by the Shannon limit,the traditional single-core single-mode fiber is difficult to further expand the transmission capacity in the network.Therefore,on the basis of the proposed multi-core optical fiber(MCF),space division multiplexing elastic optical networks(SDM-EONs)are considered as one of the most potential solutions to break through the network capacity bottleneck.At the same time,the applications in the network have diversified demand characteristics,but it is difficult for physical facility providers to flexibly configure the network according to the specific needs of the applications.In recent years,the increasingly developed network virtualization technology has solved the problem of network rigidity and formed a diversified network structure.The combination of network virtualization technology and SDM-EONs can improve the utilization rate of the underlying physical resources,but it will make the virtual network mapping more complex.Furthermore,virtual network mapping inevitably needs to meet more constraints.There are also physical layer constraints of inter-core crosstalk(XT)in SDM-EONs.When the overlapping spectral segments of adjacent cores are occupied by different optical paths at the same time,the transmission quality of optical paths will be degraded,and high-quality transmission of normal signals cannot be realized.Therefore,this paper focuses on SDM-EONs based on MCF to solve the virtual network mapping problem of crosstalk perception.Methods In this paper,the crosstalk impact of the occupied spectrum resources on the adjacent core spect

关 键 词：光纤光学 空分复用弹性光网络 虚拟网络映射 芯间串扰 频谱分区 串扰改善率 

分 类 号：TN929.11[电子电信—通信与信息系统]