Defragmentation of Transparent Flexible Optical WDM (FWDM) Networks

Patel, Ankitkumar N.; Ji, Philip N.; Jue, Jason P.; Wang, Ting

doi:10.1364/ofc.2011.otui8

Cited by 128 publications

(77 citation statements)

References 4 publications

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“…The primary goal is to rearrange existing connections in a way that available slots remain continuous, clearing more space for new incoming requests, thus reducing blocking probabilities. Four main spectrum defragmentation techniques are proposed in the literature: (a) reoptimization technique [34], (b) make-before-break [27], (c) push-and-pull technique [35], and (d) hitless technique [36] / hop tuning [37].…”

Section: B Fragmentation/defragmentationmentioning

confidence: 99%

A Defragmentation-Ready Simulation Framework For Elastic Optical Networks

Tessinari

Colle

Garcia

2017

JCIS

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Abstract-In this paper we explore in details the framework ElasticO++, which is a simulation framework for Elastic Optical Networks using OMNeT++. ElasticO++ is the first software available capable of working with spectrum defragmentation in dynamic network scenarios. The flexibility offered by the discussed tool allows both academia and industry to develop and evaluate new algorithms and techniques for Elastic Optical Networks. In this paper, we focus on ElasticO++ architecture, algorithms, and the features which we consider makes our framework unique. Additionally, we present a simulation case study and the newer features we are currently developing.

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Section: B Fragmentation/defragmentationmentioning

confidence: 99%

A Defragmentation-Ready Simulation Framework For Elastic Optical Networks

Tessinari

Colle

Garcia

2017

JCIS

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“…al. in [13] proposed two defragmentation algorithms, called Greedy, and Shortest Path. The first one, selects k-shortest routes, and try to reroute every established connection in other ones with available slot-blocks with lower indexes, to leave a bigger amount of contiguous slot-blocks on the higher indexes to accommodate future connections ( Fig.…”

Section: A Proactive Approachesmentioning

confidence: 99%

Performance evaluation of non-hitless spectrum defragmentation algorithms in elastic optical networks

Martínez

Pinto-Roa

2017

2017 XLIII Latin American Computer Conference (CLEI)

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Abstract-Fragmentation in Elastic OpticalNetworks is an issue caused by isolated, non-aligned, and non-contiguous frequency slots that can not be used to allocate new connection request to the network, due to the optical layer restrictions imposed to the Routing and Spectrum Assignment (RSA) algorithms. To deal with this issue, several studies about Spectrum Defragmentation have been presented. In this work, we analyze the most important Non-Hitless Defragmentation Algorithms found in the literature, with proactive and reactive approaches that include rerouting and non-rerouting schemes, and compare their performance in terms of Blocking Probability, Entropy, and Bandwidth Fragmentation Ratio. Simulations results showed that the Fragmentation Aware schemes outperformed the other algorithms in low traffic load, but the Reactive schemes got better results in high traffic load.

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“…These may lead to inefficient spectrum utilization and inflexible accommodation of various types of traffic, as each WDM channel occupies the same spectrum width without regard of the transmitted data rate, and each data rate needs a separate transponder which cannot be reconfigured once deployed (although some high-speed (e.g., 100 Gb/s) data-rate-adaptive transponders are currently emerging [66]). Sub-wavelength services could be supported with optical transport network grooming switches; however these electrical switches have high cost and energy consumption.…”

Section: A Elastic Optical Network Conceptmentioning

confidence: 99%

“…Sub-wavelength services could be supported with optical transport network grooming switches; however these electrical switches have high cost and energy consumption. These problems are expected to become even more significant when higher-speed transmission systems (e.g., 100 Gb/s and beyond) are deployed.…”

Section: A Elastic Optical Network Conceptmentioning

confidence: 99%

A Survey on OFDM-Based Elastic Core Optical Networking

Zhang

Leenheer

Morea³

et al. 2013

IEEE Commun. Surv. Tutorials

347

134

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Abstract-Orthogonalfrequency-division multiplexing (OFDM) is a modulation technology that has been widely adopted in many new and emerging broadband wireless and wireline communication systems. Due to its capability to transmit a high-speed data stream using multiple spectral-overlapped lower-speed subcarriers, OFDM technology offers superior advantages of high spectrum efficiency, robustness against inter-carrier and inter-symbol interference, adaptability to server channel conditions, etc. In recent years, there have been intensive studies on optical OFDM (O-OFDM) transmission technologies, and it is considered a promising technology for future ultra-high-speed optical transmission. Based on O-OFDM technology, a novel elastic optical network architecture with immense flexibility and scalability in spectrum allocation and data rate accommodation could be built to support diverse services and the rapid growth of Internet traffic in the future. In this paper, we present a comprehensive survey on OFDM-based elastic optical network technologies, including basic principles of OFDM, O-OFDM technologies, the architectures of OFDMbased elastic core optical networks, and related key enabling technologies. The main advantages and issues of OFDM-based elastic core optical networks that are under research are also discussed.

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Defragmentation of Transparent Flexible Optical WDM (FWDM) Networks

Cited by 128 publications

References 4 publications

A Defragmentation-Ready Simulation Framework For Elastic Optical Networks

A Defragmentation-Ready Simulation Framework For Elastic Optical Networks

Performance evaluation of non-hitless spectrum defragmentation algorithms in elastic optical networks

A Survey on OFDM-Based Elastic Core Optical Networking

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