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Hybrid Policy of Routing and spectrum assignment in Elastic Optical Networks

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Open Journal of Applied Sciences 2023年第12期13卷 2387-2394页

作者： Joël Adépo Georges Nogbou Anoh Joseph Wognin Vangah Digital Research and Expertise Unit (UREN) Virtual University of Ivory Coast (UVCI) Abidjan C&#244te d’Ivoire

The major challenge in elastic optical networks is to determine the path of a connection and to allocate spectral resources on the links of this path. This problem consists of two sub-problems, routing and spectrum allocation. In the literature, these sub-problems are solved with a predefined order for all topology node pairs. Recent work proposes hybrid resolution algorithms based on connection demand and network state to provide a solution to these problems. However, the blocking rate of new connection requests has become problematic. In this work, we propose a hybrid routing and spectrum assignment policy to improve blocking rate of new connection requests. The proposed solution consists to change the routing policy of a pair node if the connection request is blocked. This algorithm improves the blocking rate of new connection requests.

关键词： Routing spectrum assignment Elastic Optical Network

Study on Band Structure of YbB_6 and Analysis of Its Optical Conductivity spectrum

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Journal of Rare Earths 2007年第6期25卷 654-664页

作者：姜骏卞江黎乐民 Beijing National Laboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University

The electronic structure of YbB6 crystal was studied by means of density functional （GGA ＋ U） method. The calculations were performed by FLAPW method. The high accurate band structure was achieved. The correlation between the feature of the band structure and the Yb-B6 bonding in YbB6 was analyzed. On this basis, some optical constants of YbB6 such as reflectivity, dielectric function, optical conductivity, and energy-loss function were calculated. The results are in good agreement with the experiments. The real part of the optical conductivity spectrum and the energy-loss function spectrum were analyzed in detail. The assignments of the spectra were carried out to correlate the spectral peaks with the interband electronic transitions, which justify the reasonable part of previous empirical assignments and renew the missed or incorrect ones.

关键词： YbB6 band structure optical conductivity energy-loss function spectrum assignment rare earths

Cost-Minimized Virtual Elastic Optical Network Provisioning with Guaranteed QoS

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China Communications 2021年第9期18卷 148-166页

作者： Shifeng Ding Zile Jiang Sanjay K.Bose Gangxiang Shen School of Electronic and Information Engineering Soochow UniversityJiangsuChina Suzhou Key Laboratory of Advanced Optical Communication Network Technology Soochow UniversitySoochow UniversityChina Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Soochow UniversitySoochow UniversityChina Department of Information Engineering The Chinese University of Hong KongHongKongChina Kuang Yaming Honors School Nanjing UniversityJiangsuChina Department of EEE IIT GuwahatiIndia

Network virtualization is important for elastic optical networks(EONs)because of more flexible service *** ensure guaranteed quality of service(QoS)for each virtual elastic optical network(VEON),clients usually request network resources from a network operator based on their bandwidth requirements predicted from historical traffic ***,this may not be efficient as the actual traffic demands of users always *** tackle this,we propose a new VEON service provisioning scheme,called SATP,which consists of three stages,i.e.,spectrum assignment(SA),spectrum trading(ST),and spectrum purchasing(SP).Unlike conventional once-for-all VEON service provisioning approaches,the SATP scheme first allocates spectrum resources to VEONs according to their predicted bandwidth requirements with a satisfaction ratio α(0spectrum resources from a network operator if the spectrum resources are still *** optimize this entire process,we formulate the problem as a mixed integer linear programming(MILP)model and also develop efficient heuristic algorithms for each stage to handle large test *** are conducted under different test conditions for both static and dynamic traffic demand *** show that the proposed SATP scheme is efficient and can achieve significant performance improvement under both static and dynamic scenarios.

关键词： virtual elastic optical network virtual optical network embedding spectrum assignment spectrum trading spectrum purchasing

Suboptimal stochastic H-two/H-infinity design with spectrum constraint

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控制理论与应用（英文版） 2008年第3期6卷 317-321页

作者： Zhongwei LIN Weihai ZHANG Yan LIN School of Automation Beijing University of Aeronautics and Ash＇onautics Beijing 100083 China College of Information and Electrical Engineering Shandong University of Science and Technology Qingdao Shandong 266510 China

This paper studies the problem of suboptimal state-feedback H-two/H-infinity control of stochastic systems with spectrum constraint. Concretely speaking, a mixed suboptimal H-two/H-infinity controller synthesis together with placing the spectrum into a strip region is considered, which is achieved via solving a convex optimization problem.

关键词： Stochastic stabilization Suboptimal H-two/H-infinity control spectrum assignment Linear matrix inequality (LMI)