Optimal Route, Spectrum, and Modulation Level Assignment in Split-Spectrum-Enabled Dynamic Elastic Optical Networks

Pages, Albert; Perelló, Jordi; Spadaro, Salvatore; Comellas, Jaume

doi:10.1364/jocn.6.000114

Cited by 48 publications

(28 citation statements)

References 11 publications

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“…The generated sub-lightpaths do not require to be allocated contiguously in the spectrum, , and we assume that they can be routed along different paths (i.e., multi-path slice-ability). In this way slice-ability provides the maximum benefit to the lightpath blocking probability [36], [37]. However, according with the considered SBVT architecture [12], all the sublightpaths must be served by the same SBVT at both source and destination nodes.…”

Section: Rsta-s Schemementioning

confidence: 99%

“…This increases the slice-ability effectiveness but it introduces differential delay between sub-channels that has to be compensated at the destination node. The studies in [36], [37] compare singlepath and multi-path slice-ability, whereas the work in [40] focuses on a GMPLS control plane extension to support multi-path slice-ability. Differential delay compensation is typically demanded at the OTN layer that natively support Virtual Concatenation [7].…”

Section: Introductionmentioning

confidence: 99%

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Routing, Spectrum, and Transponder Assignment in Elastic Optical Networks

Dallaglio

Giorgetti

Sambo

et al. 2015

J. Lightwave Technol.

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Abstract-Backbone networks are evolving toward Elastic Optical Network (EON) architecture that allows a flexible and efficient use of spectrum resources. Flexibility in EONs is guaranteed also by emerging sliceable bandwidth variable transponders (SBVTs) that support the simultaneous generation of multiple optical carriers. Such carriers can be used to serve different lightpaths (i.e., slice-ability), or can be merged into a single high-rate super-channel.SBVTs typically use a dedicated laser to generate each carrier, i.e., multi-lasers SBVT (ML-SBVT). Alternatively, a multi-wavelength source can be used to generate multiple carriers using a single laser, i.e., multi-wavelength SBVT (MW-SBVT). Using MW-SBVT improves the super-channel spectrum efficiency. Indeed, MW-SBVT reduces the intercarrier interference among the sub-carriers composing the super-channel, thus it is possible to reduce the guard bands among sub-carriers. With ML-SBVT, each sub-carrier suffers from unstableness of the related laser and inter-carrier interference may have a huge impact, thus higher guard bands are needed. On the other hand, the use of a MW-SBVT introduces specific constraints to the routing and spectrum assignment (RSA) because the spacing among the sub-carriers is limited to a range of specific values.To take into account the constraints introduced by transponders, this paper integrates the selection of the transponder into RSA thus proposing a dynamic routing, spectrum, and transponder assignment (RSTA) scheme supporting both ML-SBVT and MW-SBVT technologies, and aiming to combine the benefits of the two technologies. Simulation results show that the proposed RSTA scheme provides benefits in terms of achieved blocking probability compared to traditional RSA schemes. Moreover, the achieved results demonstrate that by jointly using both SBVT technologies provides significant benefits with respect to the utilization of any single SBVT technology.

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Section: Rsta-s Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Routing, Spectrum, and Transponder Assignment in Elastic Optical Networks

Dallaglio

Giorgetti

Sambo

et al. 2015

J. Lightwave Technol.

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“…The simplest method is a fragmentation aware routing and spectrum assignment (RSA) algorithm that specifies how traffic demands are routed in order to minimize fragmentation [10,16]. Approaches splitting the blocked demand into sub-demands in order to use finer granularities have also been proposed [6,7]. Another intuitive method consists of defragmenting the spectrum in such a way that free blocks are contiguous [12].…”

Section: State Of the Artmentioning

confidence: 99%

“…Related works often consider dynamic traffic scenarios to evaluate SF and different approaches are proposed [6,7,10,12,16]. These approaches consist either in avoiding as much as possible SF in planning processes, in splitting traffic demands or in reallocating some central frequencies (spectrum defragmentation).…”

Section: Introductionmentioning

confidence: 99%

Spectrum fragmentation issue in flexible optical networks: analysis and good practices

et al. 2015

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International audienceFlexible grid optical networks allow an efficient utilization of spectrum resources using 12.5-GHz frequency slot multiples instead of a fixed spacing, introducing however spectrum fragmentation (SF). In the literature, SF is often assumed to be a serious problem specifically in a dynamic traffic context. It is mostly related to the bandwidth blocking ratio due to the lack of relevant comparison criteria and efficient metrics. Besides, in operator core network, traffic behavior is instead incremental and it is forecasted for short periods of time in addition to some operational constraints that make of it a specific context. In this work, we present an exhaustive analysis and an accurate evaluation for SF issue in flexible optical networks. We also propose new metric for fragmentation measurements and some approaches to address such a problem

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“…Hence, when building the light-forest, we may not only divide the destinations in D into groups and cover each with a light-tree, but also split the traffic to certain destination(s) into multiple sub-streams and send them over several light-trees. The latter mimics the spectrum-splitting scheme for serving unicast lightpaths [11], [27].…”

Section: B Multicast Using Light-forest With R-ncmentioning

confidence: 99%

Leveraging Light Forest With Rateless Network Coding to Design Efficient All-Optical Multicast Schemes for Elastic Optical Networks

Yang

Gong

Zhou

et al. 2015

J. Lightwave Technol.

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International audienceIn this paper, we study the multicast-capable routing , modulation and spectrum assignment (MC-RMSA) schemes that consider the physical impairments from both the transmission and light-splitting in elastic optical networks (EONs). Specifically, we propose to provision each multicast request with a light-forest which consists of one or more light-trees to avoid the dilemma that because of the accumulated physical impairments, a relatively large light-tree may have to use the lowest modulation-level and hence consume too many frequency slots (FS'). In order to further improve the spectral efficiency and compensate for the differential delays among the light-trees, we incorporate the rateless network coding (R-NC) in the multicast system. We first formulate an integer linear programming (ILP) model to solve the problem for static network planning. Then, we propose three time-efficient heuristics that leverage the set-cover problem and utilize layered auxiliary graphs. The simulation results indicate that in both the ILP and heuristics, the MC-RMSA with R-NC can achieve better performance on the maximum index of used FS' than that without. After that, we evaluate the heuristics in dynamic network provisioning. The results show that the MC-RMSA with R-NC can effectively improve the performance of all-optical multicast in EONs to reduce the blocking probability

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Optimal Route, Spectrum, and Modulation Level Assignment in Split-Spectrum-Enabled Dynamic Elastic Optical Networks

Cited by 48 publications

References 11 publications

Routing, Spectrum, and Transponder Assignment in Elastic Optical Networks

Routing, Spectrum, and Transponder Assignment in Elastic Optical Networks

Spectrum fragmentation issue in flexible optical networks: analysis and good practices

Leveraging Light Forest With Rateless Network Coding to Design Efficient All-Optical Multicast Schemes for Elastic Optical Networks

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