Strict-Sense Nonblocking Space-Wavelength-Space Switching Fabrics for Elastic Optical Network Nodes

Danilewicz, Grzegorz; Kabacinski, W.; Rajewski, Remigiusz

doi:10.1364/jocn.8.000745

Cited by 30 publications

(52 citation statements)

References 9 publications

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“…The connections served in elastic optical network must be also served by switching nodes. Several architectures have been proposed for these switching nodes in previous studies [7][8][9][10], which were surveyed briefly [11]. One of these switching fabric architectures is the wavelength-space-wavelength (W-S-W) switching fabric [12], which is referred to as WSW1 [10].…”

Section: Introductionmentioning

confidence: 99%

“…connection (I 2[1], O 1[1], 5) represented by P m can use the same FSUs in the interstage links as connections (I 1[7], O 2[6], 2) and (I 1[9], O 2[8], 2) represented by P as well) are in different rows and columns:Thus, we can say that matrices P when the result matrix is also a permutation (or a partial permutation) matrix. Matrices can be merged in two different ways:(i) Case 1 One matrix P m 2 can be merged with ⌊ mThe algorithm is presented as Algorithm 2 with two options for t 1 = ⌊ m .…”

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Rearrangeable $$2 \times 2$$ elastic optical switch with two connection rates and spectrum conversion capability

2019

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In this study, we consider simultaneous connection routing in the three-stage switching fabric of the wavelength-spacewavelength architecture for elastic optical switches, which serve connections that can occupy different spectrum widths. Recently, the upper bound of the rearrangeability conditions was derived and proved for a switching fabric serving a limited number of connection rates. A control algorithm based on matrix decomposition was also proposed. In addition, the necessary and sufficient conditions were derived and proved for a switching fabric with a size of 2 × 2 serving only two connection rates, but only when the ratios between the connection rates and link capacity are integers. In this study, we extend these results to an arbitrary ratio between the connection rates and link capacity. The number of frequency slot units required in the interstage links is much lower than that in the strict-sense nonblocking switching fabrics. We also propose modifications to the control algorithm, which further reduces the number of frequency slot units required in many cases. Finally, we extend the results for 2 × 2 switching fabrics to those with a size of r × r.

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Section: Introductionmentioning

confidence: 99%

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Rearrangeable $$2 \times 2$$ elastic optical switch with two connection rates and spectrum conversion capability

2019

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“…It should be also noted that a special type of a multirate switching network is an Elastic Optical Network (EON), regarded as a "hot topic" in optical networking and switching [34][35][36][37][38][39][40][41][42][43]. Optical networks used currently by network operators and Internet providers will be in the immediate future replaced by EONs.…”

Section: Introductionmentioning

confidence: 99%

Strict‐Sense Nonblocking Conditions for the log₂⁡N − 1 Multirate Switching Fabric for the Discrete Bandwidth Model

Rajewski

2019

Mathematical Problems in Engineering

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The article discusses the strict-sense nonblocking conditions derived for the log2⁡N-1 multirate switching fabric for the discrete bandwidth model at the connection level. Architecture of the log2⁡N-1 switching fabric was described in previous study; however, conditions for the multirate discrete bandwidth model as well as comparison with different structures have not been published before. Both sufficient and necessary conditions were introduced and proved in this study. A few numerical examples which help to understand an idea of the multirate bandwidth model for the log2⁡N-1 switching fabrics were delivered as well. Additionally a comparison of achieved results to the banyan switching structures and a comparison of the costs of all mentioned in this study structures expressed as the number of optical elements were done.

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“…Therefore, the use of different defragmentation techniques allows to set up some, or sometimes all connections which normally will not be set up due to improper utilization of the spectrum. [6] and Space-Wavelength-Space (S-W-S) [7] were proposed. In this paper, two instances of the W-S-W architecture are considered, called WSW1 and WSW2, respectively [8].…”

Section: Introductionmentioning

confidence: 99%

Defragmentation in W-S-W Elastic Optical Networks

Rajewski¹

2018

JTIT

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Abstract-In most cases defragmentation occurs, in elastic optical networks, in the links between the network's nodes. In this article, defragmentation in an elastic optical network's node is investigated. The W-S-W switching architecture has been used as a node. A short description of a purpose-built simulator is introduced. Several methods of defragmentation which are implemented in this simulator are described as well.

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Strict-Sense Nonblocking Space-Wavelength-Space Switching Fabrics for Elastic Optical Network Nodes

Cited by 30 publications

References 9 publications

Rearrangeable $$2 \times 2$$ elastic optical switch with two connection rates and spectrum conversion capability

Rearrangeable $$2 \times 2$$ elastic optical switch with two connection rates and spectrum conversion capability

Strict‐Sense Nonblocking Conditions for the log₂⁡N − 1 Multirate Switching Fabric for the Discrete Bandwidth Model

Defragmentation in W-S-W Elastic Optical Networks

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Strict-Sense Nonblocking Space-Wavelength-Space Switching Fabrics for Elastic Optical Network Nodes

Cited by 30 publications

References 9 publications

Rearrangeable $$2 \times 2$$ elastic optical switch with two connection rates and spectrum conversion capability

Rearrangeable $$2 \times 2$$ elastic optical switch with two connection rates and spectrum conversion capability

Strict‐Sense Nonblocking Conditions for the log2⁡N − 1 Multirate Switching Fabric for the Discrete Bandwidth Model

Defragmentation in W-S-W Elastic Optical Networks

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Strict‐Sense Nonblocking Conditions for the log₂⁡N − 1 Multirate Switching Fabric for the Discrete Bandwidth Model