Toronto Networking Seminar

Organized by Department of Computer Science and Department of Electrical and Computer Engineering, University of Toronto


Cross-Layer Design of All-Optical Networks Incorporating Crosstalk Effects


Yvan Pointurier
Department of Electrical and Computer Engineering
McGill University

Date:  Friday, February  8,  2pm
Location: BA 1220 

Abstract:

The performance of current optical networks is inherently limited by the speed of electronic components, and especially the electronic switches; a new generation of optical networks, referred to as all-optical networks, overcome this limitation by switching data entirely optically using all-optical crossconnects (OXCs). However, all-optical networks are prone to phenomena that are unknown to current optical networks. For instance, OXCs are subject to optical leaks, resulting in unwanted components called node crosstalk being added to transmitted signals.
Realizing that crosstalk can be a serious impairment for proper network operation, we propose to mitigate physical layer impact (including node crosstalk) at call admission time using specifically designed QoS-aware Routing and Wavelength Assignment (RWA) algorithms (a network-layer technique). Our new RWA algorithms choose a route and a wavelength for incoming calls in all-optical networks (viewed as circuit-switched networks) depending on the physical-layer state, making RWA algorithms and all-optical networks design a cross-layer issue.
We show that our new RWA algorithms outperform traditional RWA algorithms while exhibiting additional interesting properties. To decrease the time to evaluate QoS-aware RWA algorithms, we also present an analytical technique to evaluate the performance of a class of RWA algorithms incorporating multiple physical layer impairments including node crosstalk.

Bio:

Yvan Pointurier received a Diplome d'Ingenieur from Ecole Centrale de Lille (France) and a M.S. degree from the Department of Computer Science at the University of Virginia (USA) in 2002 (advisor: Jorg Liebeherr), and a Ph.D. from the Charles L. Brown Department of Electrical and Computer Engineering in 2006, also at the University of Virginia (advisor: Maite Brandt-Pearce).
He is currently a Postdoctoral Fellow in the Department of Electrical and Computer Engineering at McGill University in Montreal, Canada. His research interests span design, optimization and monitoring of networks in general, and optical networks in particular.

Host of the talk

Jörg Liebeherr (jorg@comm.toronto.edu)