Wavelength Assignment Vs. Wavelength Converter Placement in Wavelength-Routed Optical WDM Networks

Zakouni, Amiyne; Toumi, Hicham; Saidi, Abdelali; Mabrouk, Abdelfettah

doi:10.1016/j.procs.2019.11.013

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…Constraint (1) indicates that the value of the set of optical flows emitted by the source must be equal to the number of destinations |D| in the multicast session. Destination constraints:…”

Section: Tree Structurementioning

confidence: 99%

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Efficient Placement of Splitters in Optical WDM Network

Dafeur

Cousin

Ziani

2021

Preprint

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In this paper, we investigate the splitter placement problem in an optical WDM network. The goal is to select a given number of MC nodes in the network such that the overall link cost of a multicast session is minimized. We present an exact formulation in integer linear programming ( ILP ) to find a set of trees that connects a source to a set of destination nodes. Then, four algorithms based on network topology metrics are proposed to select a given number of MC nodes in the network such that the overall link cost of a multicast session is minimized. The efficiency of the proposed algorithms is verified by simulation results.

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Section: Tree Structurementioning

confidence: 99%

“…A WDM optical network is a set of nodes linked together by optical links. In such a network, an optical link supports multiple optical channels and each channel uses a specific wavelength [1][2][3]. The optical nodes may connect any channel on one of its input ports to any channel on one of its output ports [4][5].…”

Section: Introductionmentioning

confidence: 99%

Efficient Placement of Splitters in Optical WDM Network

Dafeur

Cousin

Ziani

2021

Preprint

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“…A wavelength converter is a node component that takes a signal at a given wavelength as an input and converts it into a signal using another wavelength [Iness and Mukherjee, 1999]. Due to the high cost of this node component [Petale and Jaisingh, 2018], in practice network operators equip a limited number of optical nodes with wavelength converters [Zakouni et al, 2019]. A WDM optical network in which only some optical nodes in the network are capable of performing wavelength conversion is called a sparse wavelength converter network [Pinto-Roa et al, 2015].…”

Section: Introductionmentioning

confidence: 99%

Light-tree reconfiguration without flow interruption in sparse wavelength converter network

Atta¹,

Cousin²,

Adépo³

et al. 2022

IJCNDS

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Network reconfiguration is an important task in WDM optical networks, which enables the optimisation of network resources. With the growing demand for multicast applications (e.g., distance learning, IPTV), this study focuses on the reconfiguration of the routing of a multicast connection. In this study, the path of the multicast connection is represented by a light-tree. A light-tree reconfiguration consists of migrating an optical flow from a light-tree to a new one. However, it is very difficult to automate light-tree reconfiguration without flow interruption. Flow interruption is undesirable for network operators. Therefore, the problem studied here is to find a sequence of operations in order to migrate an optical flow from a light-tree to a new one without flow interruption in a sparse wavelength converter network. For solving the light-tree reconfiguration problem, we Light-tree Reconfiguration without Flow Interruption propose a method based on a sub-tree approach. The comprehensive simulation results demonstrated the effectiveness of our method.

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“…However, wavelength converters are still expensive, and the wavelength converter technology is not very mature [4,5]. Therefore, a network in which few nodes are equipped with a wavelength converter is more practical [5,6]. A WDM optical network with a small fraction of optical nodes having a wavelength conversion capability is called a sparse wavelength converter network [7].…”

Section: Introduction 1contextmentioning

confidence: 99%

Sub-Tree-Based Approach for Reconfiguration of Light-Tree Pair without Flow Interruption in Sparse Wavelength Converter Network

Atta

Adépo²,

Cousin

et al. 2021

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Network reconfiguration is an important mechanism for network operators to optimize network performance and optical flow transfer. It concerns unicast and multicast connections. Multicast connections are required to meet the bandwidth requirements of multicast applications, such as Internet Protocol-based TeleVision (IPTV), distance learning, and telemedicine. In optical networks, a multicast connection is made possible by the creation of an optical tree-shaped path called a light-tree. The problem of light-tree pair reconfiguration is addressed in this study. Given an initial light-tree used to transfer an optical flow and a final light-tree that is computed by the network operator to optimize network performance, the goal is to migrate the optical flow from the initial light-tree to the final light-tree without flow interruption. Flow interruption is not desirable for network operators because it forces them to pay financial penalties to their customers. To solve this problem, existing methods use a branch approach that is inefficient if some network nodes do not have wavelength conversion capability. Therefore, we proposed in this study a sub-tree-based method. This approach selects and configures sub-tree pairs from the light-tree pair (initial light-tree, final light-tree) to be reconfigured. Then, we produce a sequence of configurations. The performance study confirms that our method is efficient in solving the problem of light-tree pair reconfiguration because our method does not cause flow interruption.

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Wavelength Assignment Vs. Wavelength Converter Placement in Wavelength-Routed Optical WDM Networks

Cited by 6 publications

References 12 publications

Efficient Placement of Splitters in Optical WDM Network

Efficient Placement of Splitters in Optical WDM Network

Light-tree reconfiguration without flow interruption in sparse wavelength converter network

Sub-Tree-Based Approach for Reconfiguration of Light-Tree Pair without Flow Interruption in Sparse Wavelength Converter Network

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