The Design of an Allo-Optical Packet Switching Network

Caenegem, Ruth Van; Colle, Didier; Pickavet, Mario; Demeester, Piet; Christodoulopoulos, K.; Vlachos, K.; Varvarigos, Emmanouel; Stampoulidis, L.; Roccato, D.; Vilar, Ruth

doi:10.1109/mcom.2007.4378321

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…Current end-to-end communication suffers capacity loss from inflexible switching in intermediary nodes, urging for a more flexible approach to optical switching. Addressing this need, both optical burst switching (OBS) [7,16] and optical packet switching (OPS) [17,29] provide future-proof alternatives for the next-generation network.…”

Section: 1mentioning

confidence: 99%

On the optimality of packet-oriented scheduling in photonic switches with delay lines

Rogiest¹,

Turck²,

Laevens³

et al. 2011

Numerical Algebra, Control &Amp; Optimization

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Abstract. Addressing the bandwidth inefficiency problem of current IP over DWDM backbone switching, Optical Packet/Burst Switching (OPS/OBS) provide viable solutions, capitalizing on statistical multiplexing gain, through packet-oriented scheduling. To resolve packet/burst contention, the involved photonic switches contain wavelength converters and fiber delay lines, controlled through a channel and delay selection (CDS) algorithm. Recently proposed CDS algorithms all rely on heuristics, of which the optimality is unexamined to date.This paper presents an in-depth analysis of the optimality of CDS algorithms. Methodologically, we rely on Markov chain analysis for performance evaluation, combined with a discrete Markov Decision Process formulation of the optimization problem, optimized for fast calculation, allowing to determine the exact optimum of a specific given setting of the switch, through numerical algebra solution techniques. Results point out that, for the basic switch setting assumed, of all known CDS algorithms, an algorithm called MING (MINimal Gap) is close to optimal, but never strictly optimal. Various graphs support this, showing that an algorithm optimal for any traffic load cannot (in general) be devised. Results for several other switch settings further confirm this, showing how known CDS algorithms might be modified, to attain improved control robustness.

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Section: 1mentioning

confidence: 99%

On the optimality of packet-oriented scheduling in photonic switches with delay lines

Rogiest¹,

Turck²,

Laevens³

et al. 2011

Numerical Algebra, Control &Amp; Optimization

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“…At the core nodes optical packets are switched to output ports, based on the information carried by a control packet and the availability on network resources. Ingress nodes collect data from end users or access networks and create the optical packets [4]. The transmission of optical packets is realized exclusively at the optical domain, without being stored at intermediate nodes.…”

Section: Introductionmentioning

confidence: 99%

A Simple Analytical Model for the Calculation of Packet Blocking Probability in an Optical Packet Switching Netw

Röck

Vardakas

Moscholios

et al. 2010

2010 14th Panhellenic Conference on Informatics

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Optical packet switching is a promising all-optical network technology for future large-scale networks, due to good resource utilization and the ability to handle high data rates in a cost-efficient way. In this paper we investigate the performance of an optical packet switching network, in respect of the packet blocking probability. The network supports the wavelength conversion technique, in order to reduce packet losses. We derive an analytical model for the calculation of blocking probability, based on the reduced load approximation method. The demonstration of the accuracy of the proposed analysis is realized by comparing the analytical results with that of simulation; the results found to be quite satisfactory.Keywords-component; optical packet switching, wavelength division multiplexing, packet blocking probability, reduced load approximation.

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“…In a more straightforward approach, either the packet or at least the payload is forwarded optically without conversion, since this conversion is expected to be a bottleneck in terms of conversion speed in the near future, and it thus to be circumvented. In both the first approaches, optical packet switching (OPS) [1][2][3], and the second, optical burst switching (OBS) [4,5,3], contention arises whenever two or more bursts (or packets) head for the same destination at the same time, which can be dealt with by means of buffers. Since light cannot be frozen, optical buffering is implemented by delaying the light with a set of fibers, referred to as fiber delay lines (FDLs).…”

Section: Introductionmentioning

confidence: 99%

“…If the lengths correspond to multiples of a basic value D called the granularity, the corresponding buffer is called degenerate (both terms, coined in [6]). FDLs are widely deployed for optical buffering in recent prototypes [2,7], and generally perform best in combination with wavelength conversion [8,9].…”

Section: Introductionmentioning

confidence: 99%