Optical layer multicast: rationale, building blocks, and challenges

Rouskas, George N.

doi:10.1109/mnet.2003.1174179

Cited by 195 publications

(110 citation statements)

References 15 publications

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“…It becomes increasingly evident that WDM networks are able to provide data transmission rates several orders of magnitude higher than current electronic networks, and will soon become the core technology for the next generation Internet by providing unprecedented large available wavelengths [1]. The key to high speed in these networks is to maintain signals in optical form rather than traditional electronic form with the devices such as optical crossconnects(OXCs) [2]. 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.…”

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%

“…Zhang and Yang [5] considered the multicast problem with an objective of minimizing the number of converters by providing an approximation algorithm with approximation ratio of O(log n). Rouskas [2] provided an excellent survey of the problem under the light splitter switching model.…”

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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Section: Introductionmentioning

confidence: 99%

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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“…Such a service will be implemented by using GMPLS-related protocols to establish light-trees on demand [22] . While the problem of establishing a light-tree that spans a given source and a set of destination nodes bears some similarities to the Steiner tree problem, the nature of optical multicast introduces several new issues and complexities, as we discuss next.…”

Section: ) the Steiner Tree Problemmentioning

confidence: 99%

“…The first is based on the splitter-and-delivery architecture [12] , while the second is an enhancement of the former that results in better power efficiency [2] . The reader is also referred to a recent comprehensive survey [22] of the optical multicast problem by one of the authors.…”

Section: ) the Steiner Tree Problemmentioning

confidence: 99%

Multicast routing under optical layer constraints

Xin¹,

Rouskas

Ieee Infocom 2004

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Abstract-It has been widely recognized that physical layer impairments, including power losses, must be taken into account when routing optical connections in transparent networks. In this paper we study the problem of constructing light-trees under optical layer power budget constraints, with a focus on algorithms which can guarantee a certain level of quality for the signals received by the destination nodes. We define a new constrained light-tree routing problem by introducing a set of constraints on the source-destination paths to account for the power losses at the optical layer. We investigate a number of variants of this problem, we characterize their complexity, and we develop a suite of corresponding routing algorithms; one of the algorithms is appropriate for networks with sparse light splitting and/or limited splitting fanout. We find that, in order to guarantee an adequate signal quality and to scale to large destination sets, light-trees must be as balanced as possible. Numerical results demonstrate that existing algorithms tend to construct highly unbalanced trees, and are thus expected to perform poorly in an optical network setting. Our algorithms, on the other hand, are designed to construct balanced trees which, in addition to having good performance in terms of signal quality, they also ensure a certain degree of fairness among destination nodes. While we only consider power loss in this work, the algorithms we develop could be appropriately modified to account for other physical layer impairments, such as dispersion.

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Regenerative multiwavelength conversion at 4 × 10‐GBit/S using a single SOA

Zhang

et al. 2008

Micro & Optical Tech Letters

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Optical layer multicast: rationale, building blocks, and challenges

Cited by 195 publications

References 15 publications

Online Multicasting in WDM Networks with Shared Light Splitter Bank

Online Multicasting in WDM Networks with Shared Light Splitter Bank

Multicast routing under optical layer constraints

Regenerative multiwavelength conversion at 4 × 10‐GBit/S using a single SOA

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