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

Rumipamba-Zambrano, Rubén; Moreno-Muro, Francisco-Javier; Perelló, Jordi; Pavón‐Mariño, Pablo; Spadaro, Salvatore

doi:10.1016/j.comcom.2018.05.013

Cited by 32 publications

(28 citation statements)

References 32 publications

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“…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%

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: A Scenario Details and Assumptionsmentioning

confidence: 99%

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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“…A key issue in SS-FONs is spatial continuity constraint (SCC), i.e., the constraint that a unique spatial mode shall be assigned to all the channels along a lightpath. SCC is enforced in most of the currently proposed SS-FON architectures, e.g., in the case of independent switching over SMFBs, or the case of fractional joint switching over FM-MCFs [7][8][9]. In particular, SCC enforcement is required when SDM switching devices without a sufficient amount of internal spatial switching capability are used (e.g., the reconfigurable optical add-drop multiplexers for independent switching without lanechange support in [8]).…”

Section: Introductionmentioning

confidence: 99%

“…SCC is enforced in most of the currently proposed SS-FON architectures, e.g., in the case of independent switching over SMFBs, or the case of fractional joint switching over FM-MCFs [7][8][9]. In particular, SCC enforcement is required when SDM switching devices without a sufficient amount of internal spatial switching capability are used (e.g., the reconfigurable optical add-drop multiplexers for independent switching without lanechange support in [8]). These devices have lower complexity, and hence lower cost, but they are also characterized by limited or no switching flexibility in the spatial dimension [3,10].…”

Section: Introductionmentioning

confidence: 99%

Fragmentation metrics and fragmentation-aware algorithm for spectrally/spatially flexible optical networks

Lechowicz

Tornatore

Włodarczyk

et al. 2020

J. Opt. Commun. Netw.

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Spectrally/spatially-flexible optical networks (SS-FONs) are a promising solution to cope with future traffic requirements in optical backbone networks. SS-FONs exploit the spatial dimension to increase network capacity while preserving resource management flexibility, as they still operate within a flex-grid composed of small frequency slots (slices). Flex-grid allows realizing transmission using super-channels (SChs) that comprise a set of contiguous slots. In this paper, we focus on spectral SChs, i.e., a SCh realized only on one spatial mode on each fiber. In SS-FONs, setting up and tearing down multiple lightpath requests within flex-grid may result in spectrum fragmentation, and, in turn, blocking of requests. In this work, we investigate several fragmentation metrics in SS-FON. The problem of identifying appropriate metrics to measure fragmentation has been investigated in single-core elastic optical networks (EONs), but, to the best of our knowledge, there is lack of such investigation for SS-FONs. Therefore, we propose several fragmentation metrics for SS-FON. We introduce the concept of bordering super-channels (B-SChs), i.e., SChs whose spectrum is allocated at the "border" of already allocated spectrum slots that are promising SChs to be chosen to minimize fragmentation. The investigation of all candidate B-SCh for a request allows us to find the one which minimizes network fragmentation, and, in turn spectrum waste. Hence, we propose a fragmentation-aware algorithm with bordering super-channels (FA-BSC) that assigns optical resources to dynamic requests utilizing information from the proposed fragmentation metrics and the set of candidate B-SChs. Experiments on a representative network topology show that the investigation of multiple B-SChs in the fragmentation-aware algorithm reduces the blocking probability when compared to the reference fragmentation-aware algorithms. Finally, we analyze the impact of a spatial continuity constraint on the network fragmentation.

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“…Dicho trabajo se expande sustancialmente en el análisis off-line en un contexto MCF (Multi Core Fiber) publicado en la revista Journal of Optical Communications and Networking [Moren17]. Por otra parte, la idea de continuidad es puesta a prueba satisfactoriamente en un marco dinámico en el artículo publicado en la revista Computer Communications [Rumip18]. Finalmente, [Moren18c] resume los logros del proyecto Elastic Networks, donde se incluyen los obtenidos en el campo SDM/flex-grid anteriormente mencionados.…”

Section: Publicaciones Derivadas De La Tesisunclassified

“…Las contribuciones académicas de la tesis al proyecto ONOFRE se exponen en las siguientes publicaciones: [Rumip17a], [Moren17], [Pavon17], [Rumip18].…”

Section: Proyecto Onofreunclassified

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

Cited by 32 publications

References 32 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

Fragmentation metrics and fragmentation-aware algorithm for spectrally/spatially flexible optical networks

Planificación y optimización de redes ópticas en el Internet del futuro

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