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Towards An Optimal Core Optical Network Using Overflow Channels

Menon, Pratibha (2009) Towards An Optimal Core Optical Network Using Overflow Channels. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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This dissertation is based on a traditional circuit switched core WDM network that is supplemented by a pool of wavelengths that carry optical burst switched overflow data. These overflow channels function to absorb channel overflows from traditional circuit switched networks and they also provide wavelengths for newer, high bandwidth applications. The channel overflows that appear at the overflow layer as optical bursts are either carried over a permanently configured, primary light path, or over a burst-switched, best-effort path while traversing the core network. At every successive hop along the best effort path, the optical bursts will attempt to enter a primary light path to its destination. Thus, each node in the network is a Hybrid Node that will provide entry for optical bursts to hybrid path that is made of a point to point, pre-provisioned light path or a burst switched path. The dissertation's main outcome is to determine the cost optimality of a Hybrid Route, to analyze cost-effectiveness of a Hybrid Node and compare it to a route and a node performing non-hybrid operation, respectively. Finally, an example network that consists of several Hybrid Routes and Hybrid Nodes is analyzed for its cost-effectiveness. Cost-effectiveness and optimality of a Hybrid Route is tested for its dependency on the mean and variance of channel demands offered to the route, the number of sources sharing the route, and the relative cost of a primary and overflow path called path cost ratio. An optimality condition that relates the effect of traffic statistics to the path cost ratio is analytically derived and tested. Cost-effectiveness of a Hybrid Node is compared among different switching fabric architecture that is used to construct the Hybrid Node. Broadcast-Select, Benes and Clos architectures are each considered with different degrees of chip integration. An example Hybrid Network that consists of several Hybrid Routes and Hybrid Nodes is found to be cost-effective and dependent of the ratio of switching to transport costs.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairThompson, Richard Athompson@sis.pitt.eduRTHOMPSO
Committee MemberRezgui,
Committee MemberKonak,
Committee MemberTipper, Daviddtipper@mail.sis.pitt.eduDTIPPER
Committee MemberRajgopal, Jayantrajgopal@pitt.eduRAJGOPAL
Committee MemberZnati,
Date: 12 May 2009
Date Type: Completion
Defense Date: 17 April 2009
Approval Date: 12 May 2009
Submission Date: 1 May 2009
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: School of Information Sciences > Information Science
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Core Optical Networks; Facility switching; Hybrid nodes; Hybrid OCS/OBS; Hybrid routes; Optical burst Switching; Optical circuit Switching; path cost ratio; Switching architecture
Other ID:, etd-05012009-100200
Date Deposited: 10 Nov 2011 19:43
Last Modified: 15 Nov 2016 13:43


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