A scalable design of multigranularity optical cross-connects for the next-generation optical Internet

This paper proposes a scalable design for next-generation optical cross-connects (OXCs). We present a novel strategy for dimensioning the switching capability as a long term planning. Switching fabrics in OXCs have to be expanded according to traffic growth, which may incur a scalability problem due...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2003-09, Vol.21 (7), p.1133-1142
Main Authors: Pin-Han Ho, Mouftah, H.T., Jing Wu
Format: Article
Language:English
Subjects:
Computer networks
Costs
Demand
Fabrics
Integer programming
Internet
Linear programming
Manufacturing
Networks
Optical design
Scalability
Strategic planning
Switching
Switching theory
Telecommunication traffic
Theory of constraints
Traffic engineering
Traffic flow
Wavelength assignment
Wavelength routing
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Summary:This paper proposes a scalable design for next-generation optical cross-connects (OXCs). We present a novel strategy for dimensioning the switching capability as a long term planning. Switching fabrics in OXCs have to be expanded according to traffic growth, which may incur a scalability problem due to the exponentially increasing cost in manufacturing and maintenance. The proposed scheme expands the switching capacity of OXCs with waveband- and fiber-switching components (or, equivalently, expands the network capacity with waveband- and fiber-switching tiers). To minimize the number of extra fibers for waveband- and fiber-switching tiers required to satisfy a given traffic matrix, we formulate the problem of routing and wavelength assignment (RWA) with tunnel allocation (RWAT) into a constraint programming (CP) process. The CP is simplified as two integer linear programming (ILP) processes that are performed sequentially. Experiments are conducted on four examples to compare the throughput and the number of switching points when different switching architectures are adopted under different traffic increase. The benefits of our approach are demonstrated. Finally, we conclude that the proposed optimization scheme can dimension the networks with expandability and scalability to the growing traffic demand.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2003.815975