Capacity Quantification of Joint-switching-enabled Flex-Grid/SDM Optical Backbone Networks

Rumipamba-Zambrano, Rubén; Perelló, Jordi; Gené, Joan M.; Spadaro, Salvatore

doi:10.1364/ofc.2017.w4f.8

Cited by 9 publications

(8 citation statements)

References 8 publications

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“…Finally, for | |=30, | | _ is equal to only 3, and there is no need for MIMO equalization (0% MIMO requirement). This result confirms previous findings presented in [24] about ICXT impact. The fact is that ICXT impact depends on a combination of several topological characteristics (network diameter, average path length, network connectivity, etc.)…”

Section: Mimo Equalization and Spectral Requirements Benefitssupporting

confidence: 93%

“…For the experiments carried out in next subsections, we consider that each network link is equipped with one weakly-coupled MCF of | | ∈ {7, 12, 19, 22, 30}, whose characteristics match those of real MCF prototypes found in the literature [25], [31]- [34]. These reported prototypes are the best single-mode MCFs (in terms of ICXT) and they have been selected in line with our previous work [24], [35]. The measured worst aggregate ICXT of these MCF prototypes is shown in Tab.…”

Section: A Scenario Details and Assumptionsmentioning

confidence: 99%

“…However, when high-order or distance-adaptive modulation formats are considered, like in Flex-Grid networks, significant performance gaps between Multi-Fiber (MF) -a crosstalk-free SDM fiber based on parallel single-mode fibers within the same fiber ribbon cableand MCF solutions can appear. The fact is that, although low ICXT is present, it forces to employ more robust but less spectrally efficient modulation formats over long distance paths affecting the network GoS, as demonstrated in [9], [24]. Hence, the feasibility and convenience of MIMO equalization to compensate ICXT is an interesting case study from a network planning perspective.…”

Section: Introduction and Related Workmentioning

confidence: 99%

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Route, Modulation Format, MIMO, and Spectrum Assignment in Flex-Grid/MCF Transparent Optical Core Networks

Rumipamba-Zambrano

Perelló

Spadaro

2018

J. Lightwave Technol.

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In this paper, we target an optimal Multiple-Input Multiple-Output Digital Signal Processing (MIMO-DSP) assignment to super-channels affected by inter-core crosstalk (ICXT) in Multi-Core Fiber (MCF)-enabled transparent optical core networks. MIMO-DSP undoes ICXT effects, but can be costly with high core density MCFs. Hence, its implementation in the network must be carefully decided. We address our objective as a joint Route, Modulation format, MIMO and Spectrum Assignment (RMMSA) problem, for which Integer Linear Programming (ILP) formulations are provided to optimally solve it in small network scenarios. Moreover, several heuristic approaches are also proposed to solve large-scale problem instances with good accuracy. Their goal is to minimize both network spectral requirements and the amount of MIMO equalized super-channels, taking a crosstalk-free Space Division Multiplexing (SDM) solution as a reference, for example, based on parallel single mode fibers (i.e., a Multi-Fiber -MF-scenario). For our evaluation, we consider several state-of-the-art MCF prototypes and different network topologies. The obtained results, with the considered MCFs, disclose that in national backbone networks, the desirable percentage of super-channels with MIMO equalization to match the performance of an equivalent crosstalk-free SDM solution ranges from 0-36%, while in continental-wide networks this range raises up to 0-56%. In addition, in the case of a non-ideal MIMO (with a 3 dB/km of crosstalk compensation), such percentages range from 0-28% and 0-45% in national and continental-wide backbone networks, respectively, experimenting a performance gap up to 12% with respect to the MF reference scenario.

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Section: Mimo Equalization and Spectral Requirements Benefitssupporting

confidence: 93%

Section: A Scenario Details and Assumptionsmentioning

confidence: 99%

Section: Introduction and Related Workmentioning

confidence: 99%

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Route, Modulation Format, MIMO, and Spectrum Assignment in Flex-Grid/MCF Transparent Optical Core Networks

Rumipamba-Zambrano

Perelló

Spadaro

2018

J. Lightwave Technol.

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“…One simple and direct approach is to reuse lighpaths for allocating traffic demands sharing the same source and destination nodes. This can be seen as end-to-end spatial traffic grooming allowing the traffic aggregation only in the source and destination nodes (e.g., see heuristic in [37]). Fig.…”

Section: Super-channel Allocation Supported By Sdm-roadmsmentioning

confidence: 99%

Space continuity constraint in dynamic Flex-Grid/SDM optical core networks: An evaluation with spatial and spectral super-channels

Rumipamba-Zambrano

Moreno-Muro

Perelló

et al. 2018

Computer Communications

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Space Division Multiplexing (SDM) appears as a promising solution to overcome the capacity limits of single-mode optical fibers. In Flex-Grid/SDM optical networks, nodes offering full interconnection between input/output fiber ports and spatial channels, typical SDM-Reconfigurable Optical Add/Drop Multiplexer (SDM-ROADM) referred to as independent switching with lane support (InS with LC support), require very complex and expensive node architectures. Alternative designs have been proposed to relax their requirements, such as those realizing Joint-switching (JoS) by switching one spectrum slice across all spatial channels at once. In this work, we evaluate the benefits of a cost-effective SDM-ROADM architecture that makes a trade-off between (i) performance in terms of network throughput and (ii) architectural complexity by forcing the Space Continuity Constraint (SCC) end-to-end, that is, along the connection physical path. The performance and architectural complexity of such a SDM-ROADM solution are compared in dynamic Flex-Grid/SDM scenarios against benchmark networks based on InS with LC support and JoS SDM-ROADMs, under both spatial and spectral super-channels. We quantify the network throughput when scaling the spatial multiplicity from 7 to 30 spatial channels, considering Multi-Fiber (MF) as well as Multi-Core Fiber (MCF) SDM solutions. The obtained results reveal that differences in terms of network throughput employing InS without LC support SDM-ROADMs is merely up to 14% lower than InS with LC support SDM-ROADMs, while the network CAPEX can be dramatically reduced by 86%. In contrast, networks employing InS without LC support SDM-ROADMs carry up to 40% higher throughput than JoS ones, whereas the network CAPEX can be raised up to 3x. This paper also analyses the spatial multiplicity impact on both network metrics (throughput and CAPEX).

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“…con r d siendo el bit-rate de la demanda d, SE la eficiencia espectral de la modulación seleccionada y ∆ f s el ancho espectral de un FS unitario. En caso de utilizar súper canales espectrales, n s = 1, mientras que el número de Spa-SChs viene determinado por el mínimo que satisfaga el cantidad mínima de FSs necesaria para alojar el line-rate de la demanda [Rumip17b]. Las líneas 10 a 22 analizan, para cada espacio s i de la fibra, el cumplimiento de las exigencias de continuidad y contigüidad espectral a lo largo del todo el camino Figura 4.13: Pseudocódigo del algortimo heurístico para resolver el RMSSA.…”

Section: Algoritmo Heurístico Rmssaunclassified

Planificación y optimización de redes ópticas en el Internet del futuro

Muro¹,

Javier²

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The strict requirements required for the future 5G network, jointly with the high growth forecasts of IP traffic, mainly based on the proliferation of cloud services, create a future panorama full of uncertainties from the perspective of large optical telecommunications networks. Planning and optimization tasks are essential to ensure that the requirements are satisfied in an economically viable manner. This thesis tries to analyze, in the first place, the validity of traffic growth predictions, in the light of current applications in a scenario where the latency requirements imply the evolution of CDNs with the deployment of micro-datacenters. In particular, the effect of this traffic evolution, supported by the optical backbone networks, will be analyzed. Second, the thesis studies some options that allow addressing the expected requirements of the network, from the perspective of three major approaches: a) optimization in the design and management of CDNs, b) programmable control of the network based on software-defined networking and with virtualization in network functions and finally, c) possible introduction of the Space Division Multiplexing (SDM) technology to expand the capacity of transport networks as effective support for the increase of IP traffic. The outcomes of this work conclude, in the first instance, that the evolution of the backbone traffic in the future Internet will depend on the nature of the services that the applications offer, being the balance between user traffic and synchronization one especially determining. On the other hand, the results suggest that place the content close to the users can have direct effect of decreasing the amount of traffic supported by the core networks, in relation to the current forecasts. The use cases analyzed in the SDN-NFV environment determine the need for optimization providing flexibility and programmability in the migration to virtualized systems in the networks. This set of functionalities are essential to satisfy the requirements of the future services in the 5G paradigm. In addition, the proof of concept presented in this thesis supports the joint optimization of network and IT resources for the assistance of service chains in networks based on SDN-NFV. Finally, for SDM-based optical networks, the proposal presented for space channel restriction (SCC) emerges as a valid option to be implemented in ROADMs for flex-grid environments. The validity of this proposal lies in the significant reduction in terms of implementation cost due to its lower complexity and the current availability of the equipment, at the expense of minimal performance degradations, compared to totally permissive options.

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Capacity Quantification of Joint-switching-enabled Flex-Grid/SDM Optical Backbone Networks

Abstract: We quantify the network capacity scaling from 7 to 30 spatial channels. While multifiber provides a 5x capacity increase, MCF limits it to 4x and 2x in national and continental backbone networks, respectively.

Cited by 9 publications

References 8 publications

Route, Modulation Format, MIMO, and Spectrum Assignment in Flex-Grid/MCF Transparent Optical Core Networks

Route, Modulation Format, MIMO, and Spectrum Assignment in Flex-Grid/MCF Transparent Optical Core Networks

Space continuity constraint in dynamic Flex-Grid/SDM optical core networks: An evaluation with spatial and spectral super-channels

Planificación y optimización de redes ópticas en el Internet del futuro

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