The University of Toronto Operations Research Group (UTORG) is hosting a lunch talk by Hamed Pouya. The talk is entitled “Wavelength Defragmentation Problem in Optical Networks”. Lunch and coffee will be provided. Hope to see you there!
Who: Hamed Pouya, Postdoc, University of Toronto
When: Thursday, January 24th @ 12:00pm – 1:00pm
Bio-sketch: I am a Ph.D. student at Concordia University, Montreal. I will start my postdoc from March in U of T with Dr. Merve Bodur. I have been collaborating with Ciena Co. (a world leading company in telecommunications) since 2015. My focus in Ph.D. is on using decomposition methods to tackle large scale problems in the telecommunication industry.
Abstract: Future optical networks, in particular, Software Deﬁned Optical Networks (SDONs), are expected to provide reconﬁgurable services while maintaining an efﬁcient usage of wavelength resources. I’ll present a make before break wavelength defragmentation process, which provides the best possible lightpath network provisioning, i.e., with minimum bandwidth requirement. We propose an original solution scheme which, at defragmentation times, (i) computes an optimal lightpath provisioning, (ii) check if it is made before break reachable from the fragmented current one, (iii) if not, go on with an iterative process which recomputes a lightpath provisioning using a Nested Column Generation scheme subject to additional constraints for eliminating the rerouting deadlocks.