Thumbnail
Access Restriction
Subscribed

Author Mehta, D. ♦ O'Sullivan, B. ♦ Ozturk, C. ♦ Quesada, L. ♦ Simonis, H.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2014
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Special computer methods
Subject Keyword Optical interconnections ♦ Integrated optics ♦ Passive optical networks ♦ Optical design ♦ Resource management
Abstract We consider a network design problem arising in the development of an all-optical future generation Internet network called a flex-grid. An optical island is a set of core nodes that can be fully interconnected by transparent wavelength routes. We present a mathematical model for finding an optimal optical island, show that it is an NP-hard problem, and present a decomposition for solving it. In a first phase, we choose network links and route the traffic over the resulting network. In the second phase, we allocate the light-paths associated with the traffic requests to individual fibres and spectrum segments on the fibres. This so-called routing and spectrum assignment (RSA) problem is a generalisation of the well-known routing and wavelength assignment problem (RWA) of conventional optical networks. Flex-grid optical networks allow us to bundle higher capacity connection requests by allocating channels in a number of contiguous frequency slots, providing increased throughput, as long as the connection length is below technological limits. We solve the first part of the decomposition with a large neighborhood search, and the second with a CP model using a single GEOST global constraint. Results for Ireland and Italy show that solutions of high quality can be found by this decomposition.
Description Author affiliation: Insight Centre for Data Analytics, Univ. Coll. Cork, Cork, Ireland (Mehta, D.; O'Sullivan, B.; Ozturk, C.; Quesada, L.; Simonis, H.)
ISBN 9781479965724
ISSN 10823409
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2014-11-10
Publisher Place Cyprus
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 2.24 MB
Page Count 8
Starting Page 560
Ending Page 567


Source: IEEE Xplore Digital Library