Multicasting in Optical Transport Networks

Iannone, E.; Listanti, M.; Sabella, R.

doi:10.1515/joc.1998.19.3.90

Cited by 11 publications

(7 citation statements)

References 23 publications

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“…Multicast in the optical domain (known as optical-layer multicast) provides several advantages compared to conventional electronic multicast such as elimination of OpticalElectronic-Optical (O-E-O) conversions that limit transparency for data rate and modulation formats, and simplifying signal replication via the inherent light splitting capability of optical switches instead of copying packets in electronic domains at higher network layers [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A scalable optical WDM multicast Beneš network with multi-channel wavelength converters

Hamza

2010

Photon Netw Commun

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An optical wavelength division multiplexing (WDM) multicast network interconnects an input signal on a given wavelength to one or more output fibers, possibly on different wavelengths (via wavelength conversion), while maintaining the signal in the optical domain. A key challenge in the design of scalable multicast networks is to reduce conversion complexity without affecting the switching capability and signal quality. In this article, we propose a scalable WDM multicast Beneš interconnection network with minimized conversion complexity. The proposed network is based on the Copy-and-Route architecture, and it uses multichannel WCs (MCWCs) for wavelength conversion. The conversion complexity of the proposed design is O(F log 2 W ) (where F is the number of fibers and W is the number of wavelengths per fiber), which is smaller than the O(F W ) complexity of the optimal design based on conventional single-channel WCs (SCWCs). We prove that, for W > 64 and for any value of F, the conversion complexity of the new design is strictly less than that of the optimal SCWCbased design regardless of the total number of wavelengths simultaneously converted by each MCWCs. Analyzes of conversion complexity of the proposed design for large values of W confirm considerable savings compared to the optimal SCWC-based design. For instance, for W = 256 and an for an arbitrary value of F, a practical implementation of the proposed design achieves 87% reduction in conversion complexity as compared to the optimal SCWC-based design.

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Section: Introductionmentioning

confidence: 99%

A scalable optical WDM multicast Beneš network with multi-channel wavelength converters

Hamza

2010

Photon Netw Commun

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“…Recently, multicast received an increasing attention in the optical network research community evident by the increasing number of publications that address the various issues related to the design and implementation of optical multicast (see for example [8][9][10][11][12][13][14]). This increasing interest is due to the fact that optical multicast provides several advantages compared to conventional electronic multicast such as elimination of optical-electronic-optical (O-E-O) conversions that limit transparency for data rate and modulation formats [9,11,15].…”

Section: Introductionmentioning

confidence: 99%

“…This increasing interest is due to the fact that optical multicast provides several advantages compared to conventional electronic multicast such as elimination of optical-electronic-optical (O-E-O) conversions that limit transparency for data rate and modulation formats [9,11,15]. However, to effectively realize multicast in the optical domain, advances in multicast optical interconnects are needed.…”

Section: Introductionmentioning

confidence: 99%

On the design of multi-wavelength copy interconnects with reduced complexity

Hamza

2009

Photon Netw Commun

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A multi-wavelength copy interconnect is a switching network capable of replicating a signal arriving at the input on a specific wavelength to one or more outputs possibly on different wavelengths. Such an interconnect can be useful in building optical multicast switches for wavelength division multiplexing (WDM) networks. In this article, we investigate, for the first time, the problem of designing copy networks that can simultaneously multicast input signals to a set of outputs while changing the wavelength of the replica according to the required routing pattern. We propose a novel multi-wavelength crossbar (MWX) switch that can switch an input signal on a specific wavelength to two different output wavelengths. The proposed MWX is used as a building block to construct two classes of multi-log 2N copy networks, namely, baseline and Beneš interconnects. The design space of the proposed interconnect classes is characterized and their hardware complexity is analyzed. We show that the proposed interconnects are transparent to existing multicast routing algorithms, and present simple routing algorithms for routing of multicast requests over the proposed designs. Comparisons with existing designs confirm that the proposed interconnects require a smaller number of space switches and wavelength conversion processes as compared to most conventional copy networks. In particular, for a large number of wavelengths and for any number of fibers the proposed design requires 50% less switching elements as compared to best available designs.

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“…Wavelength division multiplexing (WDM) is a technique that exploits the huge bandwidth of optical fibers by dividing the bandwidth into multiple channels (or wavelengths) that can operate concurrently, each at the highest data rate achievable in electronics. WDM optical networks have attracted many researchers over the past few years [1], [2], [3], [4], [5], [6], [7], [8], [9] and the next generation of the Internet is expected to employ WDM-based optical backbones [9].…”

Section: Introductionmentioning

confidence: 99%

Nonblocking WDM multicast switching networks

Yang

Wang

Qiao

2000

IEEE Trans. Parallel Distrib. Syst.

101

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AbstractÐWith ever increasing demands on bandwidth from emerging bandwidth-intensive applications, such as video conferencing, E-commerce, and video-on-demand services, there has been an acute need for very high bandwidth transport network facilities. Optical networks are a promising candidate for this type of applications. At the same time, many bandwidth-intensive applications require multicast services for efficiency purposes. Multicast has been extensively studied in the parallel processing and electronic networking community and has started to receive attention in the optical network community recently. In particular, as WDM (wavelength division multiplexing) networks emerge, supporting WDM multicast becomes increasingly attractive. In this paper, we consider efficient designs of multicast-capable WDM switching networks, which are significantly different and, hence, require nontrivial extensions from their electronic counterparts. We first discuss various multicast models in WDM networks and analyze the nonblocking multicast capacity and network cost under these models. We then propose two methods to construct nonblocking multistage WDM networks to reduce the network cost.

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Multicasting in Optical Transport Networks

Cited by 11 publications

References 23 publications

A scalable optical WDM multicast Beneš network with multi-channel wavelength converters

A scalable optical WDM multicast Beneš network with multi-channel wavelength converters

On the design of multi-wavelength copy interconnects with reduced complexity

Nonblocking WDM multicast switching networks

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