报告题目：Design and re-optimization algorithms for elastic optical networks
报告时间：2016年10月31日（星期一）上午9:00
报告地点：博习楼327室
报告人：Prof. Luis Velasco (Universitat Politecnica de Barcelona (UPC))
报告摘要：A comprehensible overview to design and re-optimization algorithms for Elastic Optical Networks is provided; examples of on-demand capacity increment and in-operation planning are presented. An extended network live-cycle and a management architecture are eventually presented.
报告人简介：Professor Luis Velasco received the B.Sc. degree in Telecommunications Engineering from Universidad Politecnica de Madrid (UPM) in 1989, the M.Sc. degree in Physics from Universidad Complutense de Madrid (UCM) in 1993, and the PhD degree from Universitat Politecnica de Catalunya (UPC) in 2009. In 1989 he joined Telefonica of Spain and was involved on the specifications and first office application of Telefonica's SDH transport network. In 2004 he joined UPC, where currently he is an associate professor at the Department of Computers Architecture (DAC) and senior researcher at the Advanced Broadband Communications Center (CCABA).
He has co-authored more than 150 papers in peer-reviewed International Journals and Conferences. He is serving as an Associate Editor of the IEEE/OSA Journal of Optical Communications and Networking (JOCN) and in the TPC of several international conferences as well as reviewer of international journals. His interests include both service and network layers, including planning, routing, and resilience mechanisms in Big Data ready software defined environments.
He has co-authored more than 150 papers in peer-reviewed International Journals and Conferences. He is serving as an Associate Editor of the IEEE/OSA Journal of Optical Communications and Networking (JOCN) and in the TPC of several international conferences as well as reviewer of international journals. His interests include both service and network layers, including planning, routing, and resilience mechanisms in Big Data ready software defined environments.
报告题目：How to solve the internet capacity crunch – new challenges in optical networks
报告时间：2016年10月31日（星期一）上午9:30
报告地点：博习楼327室
报告人：Prof. Krzysztof Walkowiak (Wroclaw University of Science and Technology)
报告摘要：In the last few years, numerous novel network services have gained much popularity. The most significant examples are cloud computing and content-oriented networking. In more details, the cloud computing has recently evolved from an emerging technology to an recognized networking approach that is gaining extensive acceptance and deployment. According to the recent “Cisco Global Cloud Index” report, the global cloud IP traffic will increase 4.1-fold from 2014 to 2019. In addition, by 2019 86% of all workloads processed in data centers will be executed in the cloud. Moreover, the content-oriented networking approach has been proposed few years ago to facilitate the distribution of various content over the Internet. For instance, according to the recent ”Cisco Visual Networking Index” Content Delivery Networks (CDNs) will carry over 64% of Internet traffic in 2020 compared to 45% in 2015. Both cloud computing and content-oriented services significantly contribute to the overall Internet traffic. What is more, other bandwidth-hungry applications and services like Internet of Things, Big Data, 5G, are forecasted to additionally increase the number of devices connected to the Internet as well as boost the demand for network bandwidth. According to the “Cisco Visual Networking Index” report, the global IP traffic will increase nearly a hundredfold from 2005 to 2020. Therefore, to overcome the possible future capacity crunch, new network technologies are required with a special focus on optical networks that are implemented in backbone networks.
Currently, the most popular optical approach is a Wavelength Switched Optical Network (WSON) implemented with the Wavelength Division Multiplexing (WDM) technology, which operates within rigid/fixed frequency grids and with single‐line‐rate (SLR) transponders making use of single-carrier modulation techniques. However, during the past couple of years, the research in optical networking has experienced significant developments mostly focused on the idea of Elastic Optical Networks (EONs). The main innovation of EON with respect to conventional WSON is the provisioning of sub-wavelength granularity for low-rate transmission and super-channel connectivity for accommodating ultra-high capacity client signals within a common network. The EONs allow to allocate flexibly appropriate-sized optical bandwidth, by means of contiguous concatenation of optical spectrum, to an end-to-end lightpath and according to traffic demand. Moreover, EONs enable the application of advanced and spectrally‐efficient modulation formats. As a consequence, the EONs utilize network resources more efficiently and, at the same time, they provide network connectivity adaptively and according to bandwidth demands.
However, due to the predicted traffic growth in the time perspective of 10-20 years, some new advances in optical networks will be required. Space-Division Multiplexing (SDM) technology seems to be an attractive candidate for future optical networks. The main idea behind SDM is to exploit the spatial dimension to provide a significant increase in the transmission system capacity. The simplest version of SDM assumes a use of fiber-bundles composed of physically-independent, single-mode fibers. More advanced SDM deployments will be based on multicore fibers (MCF) or multimode fibers (MMF).
The talk will concentrate on the evolution of optical networks and various aspects related to optimization of optical networks. First, the most popular network services will be briefly discussed together with predictions on network traffic. Next, the general idea of Elastic Optical Networks and Space-Division Multiplexing technology will be presented. The main part of the talk will be focused on optimization of optical networks (EONs and SDM) in the context of traffic patterns following from cloud computing and content-oriented networking. In more details, various approaches for optimization of will be discussed including ILP (Integer Linear Programming) modeling, heuristic and metaheuristic algorithms. Some illustrating results obtained on real topologies will be reported. Finally, new research challenges that arise in the context of SDM networks will be highlighted.
报告人简介：Krzysztof Walkowiak received the Ph.D. degree and the D.Sc. (habilitation) degree in computer science from the Wroclaw University of Science and Technology, Poland, in 2000 and 2008, respectively. Currently, he is an Associate Professor at the Department of Systems and Computer Networks, Faculty of Electronics, Wroclaw University of Science and Technology. His research interest is mainly focused on modeling and optimization of communication networks including: elastic optical networks, overlay network, content-oriented networks, survivable networks, distributed computing systems. Prof. Walkowiak has been involved in many research projects related to optimization of communication networks. He received The 2014 Fabio Neri Best Paper Award, Best Paper Award in the 7th International Workshop on Design of Reliable Communication Networks (DRCN 2009), Best Paper Award in the 7th International Workshop on Reliable Networks Design and Modeling (RNDM 2015). Prof. Walkowiak published more than 200 scientific papers including over 40 papers in JCR journals, in the field of optimization and modeling of communication networks. He is an Associate Editor of the Journal of Network and Systems Management and he serves as a reviewer for many international journals and conferences. Prof. Walkowiak is a senior member of IEEE and ComSoc.
Web page: http://www.kssk.pwr.edu.pl/walkowiak/?lang=en
报告题目：Parameter selection in optical networking with variable-code-rate transceivers
报告时间：2016年10月31日（星期一）上午10:00
报告地点：博习楼327室
报告人：Prof. Dr. Darli Augusto de Arruda Mello (School of Electrical and Computer Engineering, University of Campinas)
报告摘要：Future flexible transceivers will be able to adjust modulation format, number of subcarriers, symbol rate, and forward error correction (FEC) scheme, according to channel and network conditions. In this talk I discuss a framework that uses a combination of theoretical derivations and experimental results to recommend the best set of parameters to satisfy a specific demand to be routed along the network. In particular, for a given required transparent reach and desired net bit rate, and assuming an FEC scheme with a constant gap to capacity, the paper provides a set of modulation format, number of subcarriers, symbol rate, and code rate, which requires minimum bandwidth, while offering a conveniently low bit error rate.
报告人简介：Darli Mello studied Electrical Engineering at the RWTH–Aachen, Germany, and at the State University of Campinas (UNICAMP), Brazil, where he graduated in 2000. In 2002 he received the M. Sc. degree from the Institute for Communications Engineering (LNT) at the Munich University of Technology (TUM), Germany. In 2006 he received the Ph.D. degree from UNICAMP after research stays at the TUM and at the California Institute of Technology (Caltech). After his Ph.D. studies he spent one year with Padtec Optical Components and Systems as a senior technology engineer. From August 2008 to March 2014 he was with the Electrical Engineering Department (ENE) of the University of Brasilia (UnB) as Assistant Professor. He is now an Assistant Professor at the Communications Department (DECOM) of the School of Electrical and Computer Engineering (FEEC), University of Campinas (Unicamp). His main reseach interests are optical transmission and networking.
报告题目：Resource optimization in converged fiber and wireless access networks
报告时间：2016年10月31日（星期一）上午10:30
报告地点：博习楼327室
报告人：Lei Guo (Northeastern University)
报告摘要：The converged fiber and wireless access network, which has gained a lot of popularity by providing an anytime-anywhere access for end users with high bandwidth capacity and long distance, is facing the challenge of resource allocation and optimization due to the complexity and diversity of traffic demands. Though network virtualization becomes a promising solution by allowing the global resource optimization, there are still some defectiveness in aspects of QoS guarantee, energy saving and network survivability. In this lecture, the status and challenges are digged and analyzed. The new technologies are presented and to be state of art.
报告人简介：Lei Guo has received the PhD degree from the University of Electronic Science and Technology of China, Chengdu, China, in 2006. He is currently a professor at Northeastern University, Shenyang, China. His research interests include communication networks, optical communications, and wireless communications. He has published more than 200 technical papers in the above areas in international journals and conferences. He is currently an Editor for five international journals such as Photonic Network Communications.
报告题目：Agile and fine programmable optical switching and networking
报告时间：2016年10月31日（星期一）上午11:00
报告地点：博习楼327室
报告人：Shanguo Huang (State Key Laboratory of Information Photonics and Optical Communications (IPOC))
报告摘要：SDN enabled network virtualization will add intelligence and service agility to network through decoupling of underlay physical network and connection provisioning.In optical networks, to provide Infrastructure as a Service (IaaS) efficiently, underlay network virtualization enabling techniques are drawing more and more attentio. In this talk, our recent research on bandwidth virtualization and a time slot based fine optical bandwidth scheduling scheme in optical layer will be presented.
报告人简介：Shanguo Huang received the Ph.D. degree from Beijing University of Posts and Telecommunications (BUPT), Beijing, P. R. China, in 2006. He is currently a professor in the State Key Laboratory of Information Photonics and Optical Communications (IPOC), and vice dean in School of Electronic Engineering, in BUPT, P. R. China. He has been actively undertaking several national projects, published 3 books and more than 150 journals and refereed conferences, and authorized 18 patents. He was awarded the Beijing Higher Education Young Elite Teacher, the Beijing Nova Program, the Program for New Century Excellent Talents in University from the Ministry of Education, in 2011-2013, and the National Science Fund for Excellent Young Scholars, in 2016 respectively, His current research interests include the optical network designing, planning, the traffic control and resource allocations, especially network routing algorithms and performance analysis.