Power-efficient design of multicast wavelength-routed networks

Maher, Ali; Deogun, Jitender S.

doi:10.1109/49.887907

Cited by 123 publications

(72 citation statements)

References 17 publications

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“…Thus they are called multicast capable nodes (MC) [4]. However, when a light signal is split into m copies, the signal power on each outgoing port will be reduced to or less than 1/m of the incoming signal power [5]. Power loss, complicated architecture plus expensive fabrication prevent the availability of splitters on all network nodes.…”

Section: Light-hierarchymentioning

confidence: 99%

Light-hierarchies: Optimal multicast routes under optical constraints

Cousin

Molnar

Zhou

2010

2010 Photonics Global Conference

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Abstract-Multicast routing in all optical WDM networks where the light splitting capacity of some optical switches is limited is an important problem. The computation problem of the minimum cost multicast routes under optical constraints is NP-difficult. To solve the optimal multicast routing problem under physical constraints, we propose a new routing structure called 'light-hierarchy''. In a light-hierarchy, the multicast route can traverse the same optical switch several times using the same wavelength. This new routing structure may improve both the cost of the optical structures and the throughput on WDM multicast networks.

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Section: Light-hierarchymentioning

confidence: 99%

Light-hierarchies: Optimal multicast routes under optical constraints

Cousin

Molnar

Zhou

2010

2010 Photonics Global Conference

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“…Thus they are called multicast capable nodes (MC) [4]. However, if a light signal is split into m copies, the signal power of one copy will be reduced to or less than 1/m of the original signal power [5]. Power loss, complicated architecture plus expensive fabrication prevent the availability of splitters on all network nodes.…”

Section: Introductionmentioning

confidence: 99%

Light-hierarchy: the optimal structure for multicast routing in WDM mesh networks

Zhou

Molnar

Cousin

2010

The IEEE Symposium on Computers and Communications

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Abstract-Based on the false assumption that multicast incapable (MI) nodes could not be traversed twice on the same wavelength, the light-tree structure was always thought to be optimal for multicast routing in sparse splitting Wavelength Division Multiplexing (WDM) networks. In fact, for establishing a multicast session, an MI node could be crosswise visited more than once to switch a light signal towards several destinations with only one wavelength through different input and output pairs. This is called Cross Pair Switching (CP S). Thus, a new multicast routing structure light-hierarchy is proposed for alloptical multicast routing, which permits the cycles introduced by the CP S capability of MI nodes. We proved that the optimal structure for minimizing the cost of multicast routing is a set of light-hierarchies rather than the light-trees in sparse splitting WDM networks. Integer linear programming (ILP) formulations are developed to search the optimal light-hierarchies. Numerical results verified that the light-hierarchy structure could save more cost than the light-tree structure.

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“…The OXCs equipped with light splitters, referred to as multicast-capable OXCs (MC-OXCs), have the ability to split the incoming signal into more than one outgoing signal with the same wavelength but lower power level. The splitters are the fundamental optical device contributing to power loss [3]. Even in the ideal case the power of each output of a splitter is only 1/n of that of the input signal, where n is the fanout of the splitter.…”

Section: Introductionmentioning

confidence: 99%

“…MC-RWA includes the building of a routing tree (light-tree) and the assignment of wavelengths to the links in the tree. Since the combined multicast routing and wavelength assignment is a hard problem, the most adopted strategy is to decouple the problem into two separate subproblems: the light-tree routing problem and the wavelength assignment problem [2,3,5]. The former aims to build a routing tree for a multicast request, while the latter aims to assign the available wavelengths to the links in the tree.…”

Section: Introductionmentioning

confidence: 99%

“…Another factor increasing the cost of WDM networks is the use of wavelength converters that allow the wavelength of outgoing signals different from that of their incoming counterpart. Therefore, the number of light splitters and the number of wavelength converters in a network should be taken into account [3,4], and the splitters and converters installed at a node should be shared by all its incoming signals in a power-efficient and cost-effective WDM network.…”

Section: Introductionmentioning

confidence: 99%

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Online Multicasting in WDM Networks with Shared Light Splitter Bank

Liu

Liang

2007

NETWORKING 2007. Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet

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Abstract. We study online multicasting in WDM networks with shared light splitter bank. Our objective is to maximize the network throughput. It is desirable that the cost of realizing each multicast request be minimized, and the network throughput will be maximized ultimately through the cost saving on each individual request. We first propose a cost model for realizing an online multicast request under such network environments with limited light splitters and wavelength converters, which models the cost of utilization of network resources, particularly in modelling the light splitting and wavelength conversion ability at nodes. We then show that finding a cost-optimal multicast tree for a multicast request under the proposed cost model is NP-complete, and instead devise approximation and heuristic algorithms for it. We finally conduct experiments to evaluate the performance of the proposed algorithms. The results show that the proposed algorithms are efficient and effective in terms of network throughput.

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Power-efficient design of multicast wavelength-routed networks

Cited by 123 publications

References 17 publications

Light-hierarchies: Optimal multicast routes under optical constraints

Light-hierarchies: Optimal multicast routes under optical constraints

Light-hierarchy: the optimal structure for multicast routing in WDM mesh networks

Online Multicasting in WDM Networks with Shared Light Splitter Bank

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