Active PCE demonstration performing elastic operations and hitless defragmentation in flexible grid optical networks

Paolucci, F.; Castro, Alberto; Fresi, Francesco; Imran, Muhammad; Giorgetti, A.; Bhownik, Bishanka Brata; Berrettini, G.; Meloni, G.; Cugini, F.; Velasco, Luis; Potì, L.; Castoldi, P.

doi:10.1007/s11107-014-0464-0

Cited by 25 publications

(17 citation statements)

References 11 publications

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“…without introducing additional errors) and involves the re-configuration of an allocated bandwidth and tuning of the central frequency of the carrier. The de-fragmentation speed can be increased if all the subcarriers in a superchannel provided by the SCG are frequency locked and can be tuned simultaneously [53]. Similarly, in a restoration process different frequency slots might be allocated on recovery paths resulting in the tuning of transmission signals.…”

Section: Network Level Flexibilitymentioning

confidence: 99%

“…Frequency locked carriers from an OFC have also been used to demonstrate hitless spectral de-fragmentation in flex-grid networks [53], [66]. 400 Gb/s QPSK superchannel consisting of 4x25 GHz subcarriers from cascaded IMs based OFC was tuned for spectral de-fragmentation through the control plane.…”

Section: A Electro-optic Optical Frequency Comb Generatorsmentioning

confidence: 99%

“…Transceiver and Network flexibility [66], [108], [53], [125], [39], [156], [203] 3 Comb enabled Terabit transmission [71], [72], [144], [170], [181], [195], [196], [225], [253] 4 Field trials [120], [121] VI. OFC DE-MULTIPLEXING/ FILTERING TECHNIQUES…”

Section: C-bandmentioning

confidence: 99%

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A Survey of Optical Carrier Generation Techniques for Terabit Capacity Elastic Optical Networks

Imran

Anandarajah

Kaszubowska-Anandarajah

et al. 2018

IEEE Commun. Surv. Tutorials

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106

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Abstract-Elastic optical networks (EON) have been proposed to meet the network capacity and dynamicity challenges. Hardware and software resource optimization and re-configurability are key enablers for EONs. Recently, innovative multi-carrier transmission techniques have been extensively investigated to realize high capacity (Tb/s) flexible transceivers. In addition to standard telecommunication lasers, optical carrier generators based on optical frequency combs (OFC) have also been considered with expectations of reduced cost and inventory, improved spectral efficiency and flexibility. A wide range of OFC generation techniques have been proposed in the literature over the past few years. It is imperative to summarize the state of the art, compare and assess these diverse techniques from a practical perspective. In this survey, we identify salient features of optical multicarrier generators, review and compare these techniques both from a physical and network layer perspective. OFC demultiplexing/filtering techniques have also been reviewed. In addition to transmission performance, the impact of such sources on the network performance and real-world deployment strategies with reference to cost, power consumption, and level of flexibility have also been discussed. Field trials, integrated solutions, flexibility demonstrations are also reported. Finally, open issues and possible future directions that can lead to real network deployment are highlighted.

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Section: Network Level Flexibilitymentioning

confidence: 99%

Section: A Electro-optic Optical Frequency Comb Generatorsmentioning

confidence: 99%

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A Survey of Optical Carrier Generation Techniques for Terabit Capacity Elastic Optical Networks

Imran

Anandarajah

Kaszubowska-Anandarajah

et al. 2018

IEEE Commun. Surv. Tutorials

Self Cite

106

View full text Add to dashboard Cite

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“…For example, a recently reported scenario in [25] employing a demand size vector n = (3, 5,8,16) in an EON of four classes serving demands of 100, 200, 400, and 1000 Gbps, would not satisfy the assumptions (a) and (b). Note that, even when 1000 Gbps demands are excluded, the remaining demand size vector n = (3,5,8) would not satisfy assumption (b).…”

Section: Assumptionsmentioning

confidence: 99%

Analytical performance modeling of elastic optical links with aligned spectrum allocation

Vaezi

Akar

2015

Computer Networks

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a b s t r a c tElastic optical networking has recently been proposed for use in optical transport networks to cope with increasingly heterogeneous and dynamic demand patterns. In this paper, we study the blocking performance of a multi-class elastic optical link for which a demand needs to be allocated a contiguous subset of the entire spectrum. This problem is different than the well-known blocking problem in multi-class multi-server loss systems due to the contiguous allocation constraint. We first propose a non-work-conserving aligned spectrum allocation policy which is shown to outperform the conventional first fit-based work-conserving allocation policy without alignment. Subsequently, for blocking performance of an aligned elastic optical link with up to three different traffic classes, we propose a novel and systematic order reduction procedure for MMPPs (Markov Modulated Poisson Process) and use this procedure as the numerical engine to approximately obtain the blocking probabilities. The proposed numerical algorithm is validated under various system and traffic parameters and is shown to be effectively usable as an instrument to dimension elastic optical links.

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“…Such features as fine spectrum granularity (a result of dividing the spectrum into narrow frequency slices, e.g., of the 6.25 GHz width [2]), advanced optical modulation formats, and filtering and signal processing, constitute the basis for introducing flexibility and elasticity to network operation [3]. In the context of dynamic networks, the Application-Based Network Operations (ABNO) architecture [4] based on a centralized active stateful path Manuscript submitted on April 11, 2014.…”

Section: Introductionmentioning

confidence: 99%

Reoptimization of Dynamic Flexgrid Optical Networks After Link Failure Repairs

Żotkiewicz¹,

Ruiz

Klinkowski

et al. 2014

J. Opt. Commun. Netw.

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Abstract-In dynamic flexgrid optical networks, the usage of capacity may not be optimal due to the permanent process of setting up and tearing down connections, which, if not controlled, leads to spectrum fragmentation and, as a result, to increase of connection blocking. On top of this, a restoration mechanism that is launched in reaction to a link failure (cable cut) restores the affected lightpaths. Eventually, when the cable is repaired and its capacity becomes available for new connections, the unbalance between lightly and heavily loaded links increases, thus further decreasing the probability of finding optical paths with continuous and contiguous spectrum for future connection requests. In this paper we study the effects of re-optimizing the lightpath connections after a link failure has been repaired (namely, the AFRO problem) as an effective way for both reducing and balancing capacity usage and, by these means, for improving network performance. To solve AFRO a column generation decomposition method is presented. Illustrative numerical results show that AFRO allows to significantly decrease the request blocking probability in realistic dynamic network scenarios. Moreover, the proposed column generation algorithm delivers quasi-optimal solutions in reasonable times. Besides, traffic disruptions resulting from lightpath rerouting are practically negligible. Finally, we show that it is sufficient to apply AFRO only for a selected set of link failures in order to achieve high network performance.Index Terms-integer programming; column generation; routing and spectrum assignment; flexgrid optical networks, network survivability.

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Active PCE demonstration performing elastic operations and hitless defragmentation in flexible grid optical networks

Abstract: Peer ReviewedPostprint (published version

Cited by 25 publications

References 11 publications

A Survey of Optical Carrier Generation Techniques for Terabit Capacity Elastic Optical Networks

A Survey of Optical Carrier Generation Techniques for Terabit Capacity Elastic Optical Networks

Analytical performance modeling of elastic optical links with aligned spectrum allocation

Reoptimization of Dynamic Flexgrid Optical Networks After Link Failure Repairs

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