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学术讲座通知题目：Impairment-Aware Lightpath Routing and Regenerator Placement in Optical Networks with Physical-Layer Heterogeneity 主讲人：沈纲祥博士（苏州大学特聘教授）时间：2010年1月12日（星期三）上午9:00-10:15 主持人：张杰教授地点：行政办公楼501会议室摘要：We develop a framework that supports impairment-aware lightpath routing and wavelength assignments in optical transport networks. Different from most existing studies, we consider a more generic optical transport network with extensive physical-layer heterogeneity, including different fiber types, variable amplification span distances and attenuation coefficients. In addition, rather than a single amplifier type as in most of the existing studies, we consider multiple amplifier types for different amplification situations. Owing to the high cost of OEO regenerator, the total number of required regenerators is considered the major objective that we optimize. A best-Q routing algorithm is developed to find routes that require minimum numbers of regenerators. The first-fit wavelength assignment algorithm is extended to assign wavelength(s) for lightpaths in presence of the placed regenerators which can function as wavelength converters. Simulation studies indicate that the best-Q algorithm is efficient to significantly reduce the required number of regenerators compared to the simple shortest-path routing algorithm. Moreover, it is found that the best-Q algorithm shows stronger benefits when a network demonstrates higher physical-layer heterogeneity such as different fiber types and non-uniform span losses. The best-Q algorithm also demonstrates a better performance when a network has a higher average nodal degree. The results indicate that multiple amplifier options are important to cost-effective optical transport network design. For a network with high physical-layer heterogeneity, multiple amplifier options can significantly reduce the required number of regenerators (more than 20%) over a single amplifier option. Finally, though the best-Q algorithm somewhat increases the end-to-end lightpath latency and link loading, the increases are trivial. 主讲人简介：Gangxiang Shen is a Professor (特聘教授)with College of Electronics and Information, Soochow University since July 2010. Before he joined Soochow University, he was with Ciena Corporation, Baltimore, MD as a Lead Engineer. From May 2006 to October 2008, he was with ARC Special Research Centre for Ultra-Broadband Information Networks, Department of Electrical Engineering, University of Melbourne, Australia, as an Australian Postdoctoral Fellow (APD) and ARC Research Fellow. He was also a Research Scientist (NSERC Industrial R&D Fellow) with Optiwave Systems Inc. in Canada. He received a PhD from Department of Electrical and Computer Engineering, University of Alberta, Canada in 2006. During his PhD program, he was with Network Systems Group of TRLabs. He received an MSc from Nanyang Technological University of Singapore in 1999 and BEng from Zhejiang University in 1997. He was also a Research Associate with Network Technology Research Centre (NTRC) of Nanyang Technological University, and then a Senior Research Engineer with Institute for Infocomm Research (I2R) of Singapore from 1999 to 2001. His major research interests are next-generation optical transport networks and Green Internet. He has authored and co-authored around 45 technical papers and/or book chapters and his papers receive more than 650 citations. He is a TPC member of many international conferences such as Infocom, Globecom, ICC, and so on. His URL is http://www.gangxiang-shen.com. 校学术委员会信息光子学与光通信教育部重点实验室 2011年1月11日 -------------------------------------------------------------------------------- 返回