Push-Pull Technique for Defragmentation in Flexible Optical Networks

Cugini, F.; Secondini, Marco; Sambo, N.; Bottari, G.; Bruno, Gianmarco; Iovanna, Paola; Castoldi, P.

doi:10.1364/nfoec.2012.jth2a.40

Cited by 26 publications

(18 citation statements)

References 2 publications

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“…In this context, elastic optical networking can be seen as network level virtualization of optical networks where spectrum resources in optical fiber links are segmented as shareable resources and seamlessly aggregated to create optical paths with a spectrum width that is just enough to support heterogeneous traffic demands [6,7]. Moreover, recently reported hitless spectrum defragmentation based on continuous wavelength sweeping [8][9][10] can be viewed as a live migration of spectrum resources from one frequency slot to another, just like the migration of an OS or software from one VM to another in computing virtualization. However, it should be noted that, despite all the advances in spectrum resource level virtualization, there still remain important challenges regarding hardware level virtualization in optical networks.…”

Section: Introductionmentioning

confidence: 99%

Virtualization in Optical Networks from Network Level to Hardware Level [Invited]

Jinno¹,

Takara

Yonenaga

et al. 2013

J. Opt. Commun. Netw.

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Elastic optical networking is attracting much attention as a promising solution to achieve spectrumefficient transport of higher data rates at 100 Gbits∕s and beyond. If we draw an analogy to virtualization in cloud computing, it can be seen as network level resource virtualization of optical networks where spectrum resources in optical links are segmented as shareable resources and adaptively aggregated to create a wide variety of optical channels (OChs). In this paper, we discuss the benefits of introducing virtualization into the optical domain from the viewpoints of the network level and the hardware level. In elastic optical networks, a frequency slot through which an OCh is transported and the OCh itself are explicitly decoupled. While the adaptability in the frequency slot is brought about by bandwidth variable wavelength-selective switches, the adaptability in an OCh is yielded by digital coherent technology that is employed in transponders and regenerators. It is emphasized that in order to achieve transponders and regenerators that accommodate heterogeneous traffic demands in an economical manner, simply being adaptive is not enough, and being shareable is essential. We refer to this concept as hardware level virtualization. As examples, we describe a multiflow transponder and an elastic regenerator with results that show proof of concept. Based on the hardware virtualization concept, we propose an elastic optical transport system (EOTS) architecture that enables cost-and energy-efficient IP traffic offloading to the optical domain and improves programmability and automation of optical networks.

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Section: Introductionmentioning

confidence: 99%

Virtualization in Optical Networks from Network Level to Hardware Level [Invited]

Jinno¹,

Takara

Yonenaga

et al. 2013

J. Opt. Commun. Netw.

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show abstract

“…As connections are dynamically established and released, the issue of bandwidth fragmentation arises -leading to increased blocking probabilities. Thus, the development of spectrum defragmentation algorithms is required [13,14].…”

Section: Routing Algorithms For Optimization Of Sdm Networkmentioning

confidence: 99%

Spatial-spectral flexible optical networking: enabling switching solutions for a simplified and efficient SDM network platform

et al. 2013

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The traffic carried by core optical networks grows at a steady but remarkable pace of 30-40% year-over-year. Optical transmissions and networking advancements continue to satisfy the traffic requirements by delivering the content over the network infrastructure in a cost and energy efficient manner. Such core optical networks serve the information traffic demands in a dynamic way, in response to requirements for shifting of traffics demands, both temporally (day/night) and spatially (business district/residential). However as we are approaching fundamental spectral efficiency limits of singlemode fibers, the scientific community is pursuing recently the development of an innovative, all-optical network architecture introducing the spatial degree of freedom when designing/operating future transport networks. Spacedivision-multiplexing through the use of bundled single mode fibers, and/or multi-core fibers and/or few-mode fibers can offer up to 100-fold capacity increase in future optical networks. The EU INSPACE project is working on the development of a complete spatial-spectral flexible optical networking solution, offering the network ultra-high capacity, flexibility and energy efficiency required to meet the challenges of delivering exponentially growing traffic demands in the internet over the next twenty years. In this paper we will present the motivation and main research activities of the INSPACE consortium towards the realization of the overall project solution.

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“…Heuristics have been proposed to minimize the traffic blocking [10][11][12][13] of dynamic RSA, especially for those systems with time-varying traffic [14] or with the purpose of traffic grooming [15] or energy efficiency [16]. Furthermore, some spectrum defragmentation methods have been deployed based on a wavelength conversion technique [17] or traffic rerouting [18][19][20]. What is more, the authors of [21] proposed an aggregated method to reduce the transmitted slot availability information for GMPLS-based distributed path setup in FBON.…”

Section: Introductionmentioning

confidence: 99%

Collision-Aware Routing and Spectrum Assignment in GMPLS-Enabled Flexible-Bandwidth Optical Network

Guo

Wang

et al. 2013

J. Opt. Commun. Netw.

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In a flexible-bandwidth optical network (FBON) with a generalized multiprotocol label switching control plane, the resource reservation protocol with traffic engineering extensions (RSVP-TE) is employed to establish end-to-end bandwidth variable lightpaths. The resource reservation can be blocked due to spectrum contention of different concurrent RSVP instances (called backward blocking), and it is the predominant blocking contribution when traffic load is low and arrival highly dynamic. Also, due to its flexible traffic granularity in FBON, the backward collision would happen more frequently and the collision scenario would be more complicated than that in wavelength-routed networking; thus the need for a collision evaluation and avoiding method. So, a collisionavoiding routing with maximum available spectrum allocation (SA) options and an SA scheme to search the spectrum segment with minimum collision possibility are proposed for backward blocking reduction, as well as an extension to the RSVP-TE. Simulation results show that the proposed algorithm could achieve better blocking performance through significantly reducing the backward reservation collision but with acceptable forward blocking deterioration. At the same time, with the proposed algorithm, different granularity traffic could be served more fairly in FBON.Index Terms-Collision aware; Flexible bandwidth optical network; Routing and spectrum assignment.

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Push-Pull Technique for Defragmentation in Flexible Optical Networks

Cited by 26 publications

References 2 publications

Virtualization in Optical Networks from Network Level to Hardware Level [Invited]

Virtualization in Optical Networks from Network Level to Hardware Level [Invited]

Spatial-spectral flexible optical networking: enabling switching solutions for a simplified and efficient SDM network platform

Collision-Aware Routing and Spectrum Assignment in GMPLS-Enabled Flexible-Bandwidth Optical Network

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