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Plenary Talk I
Next-Generation SDH/SONET Networks
Dr. Kumar N. Sivarajan
Chief Technology Officer, Tejas Networks
ABSTRACT
In this talk, we will provide an overview of the developments in next-generation SDH/SONET networks.
While customer demand for data services has begun to dominate network traffic, much of the transport network infrastructure in place all over the world is based on the Synchronous Digital Hierarchy (SDH) or Synchronous Optical Network (SONET) technologies. Hence there is a need to provide cost-effective solutions for deploying data services over an SDH/SONET network infrastructure. According to a recent market report on Ethernet services over metro- and wide-area networks, more than 3.6 million Ethernet ports will be deployed by 2006, with 10/100 Mbps ports being the most widely deployed. To this end, we will first discuss next-generation SDH/SONET networks, which are optimized for cost-effective data transport, especially for providing Ethernet/IP services. We will discuss recent standardization efforts in this area including virtual concatenation, generic framing procedure (GFP) and Link Capacity Adjustment Scheme (LCAS).
Traditionally, SDH/SONET networks have not adequate intelligence in the control plane to accomplish functions such as topology discovery, route computation, and automatic provisioning. We will describe the next generation of "intelligent" optical networks that is intended to address these issues. We will discuss developments in the control and management of optical networks, including the currently evolving Generalized Multi-Protocol Label Switching (GMPLS) standards.Biography
Kumar N. Sivarajan obtained the B.Tech. degree in Electrical Engineering (Electronics) from the Indian Institute of Technology, Madras, and the M.S. and Ph.D. degrees in Electrical Engineering from the California Institute of Technology, Pasadena.
From 1990--1994, Sivarajan was with IBM Thomas J. Watson Research Center, Yorktown Heights, NY. From 1994--2000, Sivarajan was with with the Electrical Communication Engineering Department, Indian Institute of Science, Bangalore. Since May 2000, he is Chief Technology Officer of Tejas Networks, Bangalore.
Sivarajan is co-author of the book `Optical Networks: A Practical Perspective' published by Morgan Kaufmann Publishers, February 1998. He is an Associate of the Indian Academy of Sciences, a recipient of the Young Engineer Award from the Indian National Academy of Engineering, and the Swarnajayanti Fellowship from the Department of Science and Technology, Government of India. He is also a recipient of the IEEE Charles LeGeyt Fortescue Fellowship, the IEEE Communications Society William R. Bennett Prize Paper Award and the IEEE W.R.G.Baker Prize Paper Award.
Plenary Talk II
Transmission Technologies for Future Optical Networks
Professor Lu Chao
Institute for Infocomm Research, Singapore
ABSTRACT
The down turn of telecommunication industry in the past few years has created even big challenges for development in optical transmission technology. The ever increasing data traffic in the network and end user bandwidth demand require optical fibre to be moved closer and closer to the end user and the capacity on the fibre to be maximized. At the same time, cost pressure requires these to be done economically. As a result, more innovations are needed to meet these demands.
In this talk, we will provide an overview of the past developments in the area of optical transmission technologies and highlight some recent achievements. Further development in the area will then be discussed.Biography
Lu Chao obtained the BEng. degree in Electronic Engineering from Tsinghua University, China, and the M.Sc. and Ph.D. degrees in Electrical Engineering from UMIST, U.K.
From 1991to now, he has been with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. He is currently on leave from the University helping to set up a research group of 30 researchers in the area optical communication systems and networks at the Institute for Infocomm Research, A*STAR, Singapore.
Lu Chao has carried out researches in the area of optical components, transmission systems and network and has published more than 100 papers in International Journals and conferences.
Invited talks
Dr Malin Premaratne
Center for Telecommunications and Information Engineering
Department of Electrical and Computer Systems Engineering
PO Box 35, Monash University
Clayton 3800, Victoria Australia.
Tel: +613 9905 5382(office), +61394974943(home) and +61
0438640371(mobile)
malin.premaratne@eng.monash.edu.au
Title: Equipment Configuration in Optical NetworksABSTRACT
Telecommunication network operators are looking for means of reducing cost in their networks by optimal utilization of available resources. Effective network design methodologies must be introduced to handle this issue. However, given the variety in available equipment and their capabilities make the network design process very complex making optimal allocation of resources intractable. One of the interesting but difficult resource allocation problems in optical network design is on selecting a cost optimum subset of commercially available modules such as dispersion compensators or amplifiers subject to maximum module count and other constraints at a repeater hut or for an entire optical link. This problem arises because most commercially available modules have certain parameters of interest with values fixed and discrete. Therefore, any required operation such as dispersion compensation or amplification has to be done by cascading few different modules in particular order or configuration. Given that the prime objective is to reduce the cost of deployment while exceeding the minimum desired performance level, designers need to traverse the search space of all possible permissible module cascades to find the optimal combination. This search is being made even more complicated due to having restrictions on the maximum number of odules at a repeater hut due to reasons such as limitations in rack space. Even though very large, given the finite number of configuration choices, one obvious way to solvethis problem is through complete enumeration of the search space before finding the optimum enumeration that passes all the constraints. However, the number of possibilities increases rapidly as the number of module types increases and becomes practically intractable for typical network design tasks. It is much more interesting to note that this problem is NP-hard and hence belongs to a class of problems which are considered to be toughest in computer science. In this presentation, we show that even though this problem is NP-hard, certain instances can be solved in pseudo-polynomial time using very clever techniques. Specific detials on search space culling and issues related to construction of software for solving this problem are also given in the presentation.
Thas A. Nirmalathas
Melbourne Unviersity, Australia
a.nirmalathas@ee.mu.oz.au
Two talks:
Talk 1:
"Recent progress in Fibre-Wireless Networks: Technologies and Architectures"
Authors: A. Nirmalathas, C. Lim, M. Atyygalle, D. Novak and R. B. Waterhouse
ABSTRACT
Broadband wireless networks based on a number of new frequency windows at higher microwave and millimetre-wave frequencies have been actively pursued to provide ultra-high bandwidth services over a wireless networks. These networks will have a large number of antenna base-stations with high throughput. Significant reductions in antenna base-station complexity can be achieved if most of the signal routing and switching functions centralised at a central office in the network. In such a network, fibre feed networks can be effectively deployed to provide high bandwidth interconnections between multiple antenna base-stations and the central office. In this paper, we present an over view of the recent progress in subsystem technologies and network architectures related to these hybrid fibre-wireless networks.
Talk 2:
Optical Signal Monitoring For Future Optical Networks
Authors: A. Nirmalathas, E. Wong and C. LimABSTRACT
In fully re-configurable optical networks, light paths can be very long and may be subjected to accumulation of signal impairments due to linear and nonlinear effects along the transmission line as well as imperfections at various network elements such as optical filters, amplifiers, switches and optical cross-connects. Development of suitable optical signal monitoring technologies is widely regarded as one of the key requirement for the realisation of such dynamic optical networks. Already a number of techniques has been developed to address the issue and in this paper, we present a review of the techniques developed for signal monitoring in the optical domain.
Peng Gangding
Associate Professor, Acting Head
Photonics and Optical Communications
Address: School of Electrical Engineering and Telecommunications
University of New South Wales
Kensington, Sydney 2052, Australia
Tel: 61-2-93854014
Fax: 61-2-93855993
g.peng@unsw.edu.sg
Prof.Thyagarajan from IITD (ktrajan@physics.iitd.ernet.in)
K Thyagarajan
Physics Department
Indian Institute of Technology Delhi
New Delhi 110016 , India
Title: Novel dual concentric core optical fiber designs for dispersion compensation and gain flattened optical amplificationABSTRACT
Constant technological advances in dense wavelength division multiplexing (DWDM), is leading to an ever greater utilization of the capacity of optical fiber communication systems. Dispersion compensators and optical amplifiers form important components of any DWDM system and the overall performance of the system depends critically on the performance of these and other components in the link. Since a DWDM system simultaneously carries multiple channels at closely spaced wavelengths the spectral properties of the components play a major role. This has led to the development of fiber based dispersion compensators and optical amplifiers with specific wavelength dependent characteristics. Dual concentric core fibers posses very interesting characteristics and with proper designs they can be tailored to have the desired spectral properties. This talk will present our recent work on different novel dual concentric core fiber designs for efficient dispersion compensation, optical amplification and broadband filters based on long period fiber gratings. In DWDM systems it is important to have flat gain optical amplifiers for optimal performance of multiple channels. Novel designs of erbium doped fibers with intrinsic gain flattening properties and fibers for Raman amplifiers having flat gain characteristics utilizing single pumps will be presented.
Prof.Selvarajan from IISc Bangalore (rajan@ece.iisc.ernet.in)
Not confirmed.
Shizhong Xie
Tsinghua University, China
xsz-dee@mail.tsinghua.edu.cn
ABSTRACT
Design and fabrication of Sampled Fiber Bragg Gratings with Third-Order Dispersion Induced by the Sampling Structure
Shizhong Xie, Jia Feng and Xiangfei Chen
Dept. of Electronic Engineering, Tsinghua University, Beijing 100084, China
Tel: +86 10 62788161 Email: xsz-dee@tsinghua.edu.cn
ABSTRACTProperly designed sampling function of the sampled Bragg grating can produce an equivalent chirp profile within reflection bands with non-zero Fourier orders. A novel sampled fiber Bragg grating with a nonlinear local sampling period profile is designed and fabricated. Its sampling structure induces parabolic group delay spectra in the stopbands related to ±1 Fourier components, with third-order dispersion being 163 ps/nm2. The experimental result agrees well with theoretical calculation over 1.3 nm within each stopband. This kind of sampled Bragg gratings is suitable for tunable dispersion compensation or dynamic PMD compensation in high speed optical fiber communications.
Debasish Datta
ddatta@ece.iitkgp.ernet.in
Not confirmed
Poo Gee Swee
Nanyang Technological University, Singapore