Strict-Sense Nonblocking W-S-W Node Architectures for Elastic Optical Networks

Kabacinski, W.; Michalski, Marek; Rajewski, Remigiusz

doi:10.1109/jlt.2016.2560624

Cited by 40 publications

(80 citation statements)

References 21 publications

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“…In turn, each BV-WSSS has r BV-WSSs and r PCs. For a detailed description of the WSW2 switching fabric see [8].…”

Section: Eon's Architecturesmentioning

confidence: 99%

“…The first version of this tool was used to simulate strictsense non-blocking conditions for the WSW1 switching fabric. The results obtained were compared with these achieved in paper [8]. Then, the second version of the simulator was expanded to provide for rearrangeable nonblocking conditions in the WSW1 architecture.…”

Section: Simulatormentioning

confidence: 99%

“…[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]. Some abbreviations and symbols used in this paper have already been introduced, and some will be defined later.…”

Section: Introductionmentioning

confidence: 99%

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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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“…In turn, each BV-WSSS has r BV-WSSs and r PCs. For a detailed description of the WSW2 switching fabric see [8].…”

Section: Eon's Architecturesmentioning

confidence: 99%

Section: Simulatormentioning

confidence: 99%

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Defragmentation in W-S-W Elastic Optical Networks

Rajewski¹

2018

JTIT

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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%

“…In the case of elastic optical switches for the W-S-W architecture, two differences in the switching fabrics were considered by [18]: (1) a W-S-W switching fabric with no conversion capability but all of the switches are able to switch in time and space; and (2) connections with no adjacency constraints. According to [10], in the case of the SSNB conditions, the lack of conversion capability in the center stage switches and an adjacency constraint increases the required number of center stage switches or the number of FSUs in the interstage links. To the best of our knowledge, the RNB conditions for W-S-W switching fabrics for elastic optical nodes have only been considered in our recent previous study.…”

Section: Introductionmentioning

confidence: 99%

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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