Waveband Switching: A New Frontier in Optical WDM Networks

Cao, Xiaojun; Anand, Vishal; Xiong, Yu; Qiao, Chunming

doi:10.1007/0-387-22584-6_6

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…More recently, it has been recognized that combining multiple wavelengths into logical containers called "wavebands" [3] can lead to a significant reduction in the number of optical switching ports in the network, since intermediate nodes only need a single port to switch a waveband (instead of one port for each of the constituent wavelengths). This observation has led to the development of multigranular optical cross-connects (MG-OXCs) which are capable of switching optical signals at a hierarchy of granularities, including single wavelengths, single wavebands, or whole fibers.…”

Section: Introductionmentioning

confidence: 99%

A hierarchical model for multigranular optical networks

Iyer

Rouskas

Dutta

2008

2008 5th International Conference on Broadband Communications, Networks and Systems

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Abstract-We present a hierarchical algorithm for grooming lightpaths into wavebands, and routing wavebands over a network of multigranular switching nodes. This algorithm focuses on lowering the number of wavelengths W and ports over the network while being conceptually simple, scalable, and consistent with the way networks are operated and controlled in practice. Our experiments indicate that this algorithm easily scales across different waveband and network sizes.

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Section: Introductionmentioning

confidence: 99%

A hierarchical model for multigranular optical networks

Iyer

Rouskas

Dutta

2008

2008 5th International Conference on Broadband Communications, Networks and Systems

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“…The above hierarchical approach may also be applied to networks with multigranular optical switching capabilities, in which multiple wavelengths may be groomed into wavebands and all wavelengths in a waveband be switched as a group [2]. Let us define a bandpath, a generalization of the lightpath concept, as a (waveband, path) pair that uniquely identifies the path over which the set of wavelengths included in the waveband will travel.…”

Section: Extension To Lightpath Groomingmentioning

confidence: 99%

Hierarchical Traffic Grooming

Rouskas¹,

Dutta²

2008

Optical Networks

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IntroductionTraffic grooming is the field of study that is concerned with the development of algorithms and protocols for the design, operation, and control of networks with multigranular bandwidth demands [12]. As the number of logical entities (including sub-wavelength channels, wavelengths, wavebands, and fibers) that need to be controlled in a multigranular network increases rapidly with the network size, wavelength capacity, and load, a scalable framework for managing these entities becomes a sine qua non for future wide area WDM networks.Several variants of the traffic grooming problem have been studied in the literature under a range of assumptions regarding the network topology, the nature of traffic, and the optical and electronic switching model [11,13,16,18-21, 25, 26]. Typically, an integer linear programming (ILP) formulation serves as the basis for reasoning about and tackling the problem. Unfortunately, solving the ILP directly does not scale to instances with more than a handful of nodes, and cannot be applied to networks of practical size covering a national or international geographical area. Consequently, either the ILP is tackled using standard relaxation techniques, or the problem is decomposed into subproblems which are solved using heuristics.Most of the above studies regard the network as a flat entity for the purposes of lightpath routing, wavelength assignment, and traffic grooming. It is well-known, however, that in existing networks resources are typically managed and controlled in a hierarchical manner. The levels of the hierarchy either reflect the underlying organizational structure of the network or are designed in order to ensure scalability of the control and management functions. Accordingly, several studies have adopted a variety of hierarchical approaches to traffic grooming that, by virtue of decomposing the network, scale well and are more compatible with the manner in which networks operate in practice.The rest of this chapter is organized as follows. In Section 1.2 we survey hierarchical traffic grooming techniques for networks with a special topology.

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“…The network should handle hierarchical optical paths, wavelength paths and wavebands (WBs) that consist of multiple wavelength paths. Several studies have targeted the development of hierarchical optical path network design algorithms [20], [21], and have demonstrated the advantage of introducing HOXCs; most works evaluated the effectiveness in terms of the total number of HOXC ports compared to that of single-layer OXCs. Another study [22], [23] showed that a HOXC with non-uniform WB size can not only improve node throughput but also reduce cross-connect node cost.…”

Section: Introductionmentioning

confidence: 99%

Prospects and Challenges of Multi-Layer Optical Networks

Sato¹,

Hasegawa²

2007

IEICE Transactions on Communications

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SUMMARYThis paper investigates the prospects and challenges of hierarchical optical path networks. The merits and issues of introducing higher order optical paths are elucidated. State of the art of the key enabling technologies are demonstrated including hierarchical optical cross-connect switch architectures, hierarchical optical path network design algorithms, a newly developed waveband filter, and waveband conversion technologies.

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Waveband Switching: A New Frontier in Optical WDM Networks

Cited by 11 publications

References 8 publications

A hierarchical model for multigranular optical networks

A hierarchical model for multigranular optical networks

Hierarchical Traffic Grooming

Prospects and Challenges of Multi-Layer Optical Networks

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