Wavelength Assignment in Optical Networks with Limited Reconfigurability

Alnaimi, M.; Subramaniam, Suresh

doi:10.1109/glocom.2007.437

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…As the tuning range of the L-ROADMs increases the number of the L-ROADMs increases. In comparison, we showed in [8] that if the band size of the L-ROADMs is W − i, then 4i F-ROADMs (as opposed to 3i for bi-directional rings shown here) are sufficient for uni-directional rings.…”

Section: Proofmentioning

confidence: 89%

“…While there are many ways to pose this general problem, in this paper, as in [8], we choose to solve the following problem: Given a traffic set T and the number of wavelengths sufficient to support the traffic W T , determine the band sizes of the ROADMs such that the worst-case band size R = max i∈V R i is minimized and T is supportable.…”

Section: Network Model Definitions and Problem Statementmentioning

confidence: 99%

“…Unlike [3], we consider a bi-directional ring topology and assume that the bands of different L-ROADMs may be different. We presented some results for wavebanding in uni-directional ring networks in [7] and [8]. In [9], we considered a bi-directional ring network and presented some results for all-to-all traffic.…”

Section: Introductionmentioning

confidence: 98%

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Wavebanding in Bi-Directional WDM Ring Networks with Limited Reconfigurability

Alnaimi

Subramaniam

2008

2008 Proceedings of 17th International Conference on Computer Communications and Networks

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An important factor that affects the cost of WDM networks is the number of wavelengths to be added/dropped by reconfigurable optical add drop multiplexers (ROADMs). Limiting the range of wavelengths that can be accessed at a node reduces costs. In this paper, we study wavelength assignment (WA) in WDM bi-directional ring networks with limited reconfigurability and take up the problem of supporting two traffic types -permutation traffic and all-to-all traffic -while minimizing the worst-case wavelength range of the ROADMs and respecting the wavelength termination and continuity constraints. ROADMs can be limited in tuning range (L-ROADMs) or have full range (FROADMs). In this work, a node can either possess a limited-add L-ROADM or an F-ROADM. For permutation traffic, we show that at least one F-ROADM is necessary, and we also give an upper bound on the number of F-ROADMs needed as a function of the range of L-ROADMs at other nodes. For all-to-all traffic, we develop an integer linear programming (ILP) formulation,and also propose a new wavelength assignment algorithm that uses W u = N 2 4 − N 2 + 1 4 wavelengths. Our heuristic's results are similar to the ILP's. The results show that a saving of 85-93.3% in tuning range is achievable for this type of traffic.

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Section: Proofmentioning

confidence: 89%

Section: Network Model Definitions and Problem Statementmentioning

confidence: 99%

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Wavebanding in Bi-Directional WDM Ring Networks with Limited Reconfigurability

Alnaimi

Subramaniam

2008

2008 Proceedings of 17th International Conference on Computer Communications and Networks

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“…Other related work has appeared in [14,15]. Minimizing the worst-case contiguous wavelength range of ROADMs in ring networks was investigated in [14]. In [15], the authors consider the blocking performance of ROADMs using limited tunable transponders in which case the wavebands of transponders limit the reconfiguration of a full ROADM (F-ROADM).…”

Section: Introductionmentioning

confidence: 98%

“…Chen et al [13] considered the case of a single switching node with multiple inputs/outputs. Other related work has appeared in [14,15]. Minimizing the worst-case contiguous wavelength range of ROADMs in ring networks was investigated in [14].…”

Section: Introductionmentioning

confidence: 98%

Uniform waveband assignment in optical mesh networks

2011

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The cost of an optical network in wavelength division multiplexing (WDM) networks can be reduced using optical reconfigurable optical add/drop multiplexers (ROADMs), which allow traffic to pass through without the need for an expensive optical-electro-optical (O-E-O) conversion. Waveband switching (WBS) is another technique to reduce the network cost by grouping consecutive wavelengths and switching them together using a single port per waveband. WBS has attracted the attention of researchers for its efficiency in reducing switching complexity and therefore cost in WDM optical networks. In this paper, we consider the problem of switching wavelengths as non-overlapping uniform wavebands, per link, for mesh networks using the minimum number of wavebands. Given a fixed band size b s , we give integer linear programming formulations and present a heuristic solution to minimize the number of ROADMs (number of wavebands) in mesh networks that support a given traffic pattern. We show that the number of ROADMs (or number of ports in band-switching cross-connects) can be reduced significantly in mesh networks with WBS compared to wavelength switching using either the ILP or the heuristic Parts of this work were presented in [1].

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