Nonblocking Multirate 2-Stage Networks

Lin, Bingkai

doi:10.1109/lcomm.2018.2790908

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…In [ 20 ], the authors evaluated the performance of EONs when spectrum conversion is introduced in intermediate switches. The nonblocking two-stage switching fabrics with multirate connections and conversion in both stages were considered in [ 21 , 22 ]. The authors of [ 23 ] present the simulation studies of elastic optical switching fabrics based on the three-stage Clos switching fabric.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Connections Routing in Wavelength–Space–Wavelength Elastic Optical Switches

Abuelela

Żal

Kabacinski

2023

Sensors

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In this paper, we investigate the three-stage, wavelength–space–wavelength switching fabric architecture for nodes in elastic optical networks. In general, this switching fabric has r input and output switches with wavelength-converting capabilities and one center-stage space switch that does not change the spectrum used by a connection. This architecture is most commonly denoted by the WSW1 (r, n, k) switching network. We focus on this switching fabric serving simultaneous connection routing. Such routing takes place mostly in synchronous packet networks, where packets for switching arrive at the inputs of a switching network at the same time. Until now, only switching fabrics with up to three inputs and outputs have been extensively investigated. Routing in switching fabrics of greater capacity is estimated based on routing in switches with two or three inputs and outputs. We now improve the results for the switching fabrics with four inputs and outputs and use these results to estimate routing in the switching fabric with an arbitrary number of inputs and outputs. We propose six routing algorithms based on matrix decomposition for simultaneous connection routing. For the proposed routing algorithms, we derive criteria under which they always succeed. The proposed routing algorithms allow the construction of nonblocking switching fabrics with a lower number of wavelength converters and the reduction of the overall switching fabric cost.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Connections Routing in Wavelength–Space–Wavelength Elastic Optical Switches

Abuelela

Żal

Kabacinski

2023

Sensors

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Wide-Sense Nonblocking Converting-Converting Networks with Multirate Connections

Kabacinski

Rajewski

2022

Sensors

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In this paper, we consider a two-stage converting-converting (CC) switching network. This structure can be used, for instance, in switches of elastic optical networks (EONs) or in time-division switches. We propose a new routing algorithm based on fixed slot assignment in interstage links. This algorithm, called Fixed Input–interstage Slot Assignment (FISA), reduces the switching network complexity compared to the rearrangeable (RNB) switching networks of the same structure. We derive the wide-sense nonblocking (WNB) conditions for the switching network controlled by this algorithm. The obtained WNB conditions are the same as those of the RNB, but the switching network does not need troublesome and time-consuming rearrangements. When implementing the proposed switching network structure, we can also reduce the number of tunable full-range spectrum converters and replace part of them with fixed spectrum converters, or even use space switches in the first stage. This is especially important when this architecture is applied in EONs.

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Nonblocking Multirate 2-Stage Networks

Cited by 2 publications

References 16 publications

Simultaneous Connections Routing in Wavelength–Space–Wavelength Elastic Optical Switches

Simultaneous Connections Routing in Wavelength–Space–Wavelength Elastic Optical Switches

Wide-Sense Nonblocking Converting-Converting Networks with Multirate Connections

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