WDM packet switch architectures and analysis of the influence of tunable wavelength converters on the performance

Danielsen, S.L.; Mikkelsen, B.; Jœrgensen, C.; Durhuus, T.; Stubkjaer, K.E.

doi:10.1109/50.554327

Cited by 164 publications

(115 citation statements)

References 21 publications

(18 reference statements)

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“…To reduce the noise due to cross talk dynamic wavelength reallocation is used which result in an increase in maximu m buffering time. This wavelength conversion also reduces packet loss probability [19] . To minimize cross talk in DW DM networks TW Cs has been used as buffer gates.…”

Section: Wavelength Reallocationmentioning

confidence: 99%

Optical Packet Switch Architectures: A Comparative Study

Singh¹,

Verma²

2012

IJITCS

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Abstract-In this paper four fiber-loop-buffer based photonic packet switched architectures are compared. It is done in terms of their packet loss probability and their optical cost under various load conditions for the random t raffic model. The recirculat ing type delay lines are used for the storage of packets to resolve the contention. The architectures use semiconductor optical amp lifiers(SOAs) and tunable wavelength converters(TWCs) in the recircu lating loop buffer. The architectures have advantage of simu ltaneous Read/Write and, wavelength reallocation using TWCs in the recirculat ing loop buffer. Therefore, it improves the switch performance over the architectures using SOAs in the loop buffer. The cost of the various architectures is evaluated by considering FCC (fiber-tochip coupling) and the WSU (wavelength speed up factor) model.

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Section: Wavelength Reallocationmentioning

confidence: 99%

Optical Packet Switch Architectures: A Comparative Study

Singh¹,

Verma²

2012

IJITCS

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“…By combining these types of processing with optical switches, we can obt-'lin a very high-performance 1 x N photonic packet switch. A packet switch having functions (1), (2), and (4) in the optical domain is called a photonic packet switch in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers investigated photonic packet switches/routers (e.g., [8,6,2,15,11]), and some have introduced an optical buffer [8,6,2]. The functions of packet switches are roughly divided into the following five functions: (1) address/label lookup (i.e., forwarding), (2) switching, (3) buffer management, (4) buffering, and (5) routing functions.…”

Section: Introductionmentioning

confidence: 99%

“…The functions of packet switches are roughly divided into the following five functions: (1) address/label lookup (i.e., forwarding), (2) switching, (3) buffer management, (4) buffering, and (5) routing functions. A packet switch having functions (2) and (4) in the optical domain is usually called a photonic packet switch, and it requires optical switches and optical buffers. The photonic packet switch forwards packets without 0/E or E/0 conversion with functions (2) and ( 4 ); it can make use of the broadband property of an optical signal.…”

Section: Introductionmentioning

confidence: 99%

“…A packet switch having functions (2) and (4) in the optical domain is usually called a photonic packet switch, and it requires optical switches and optical buffers. The photonic packet switch forwards packets without 0/E or E/0 conversion with functions (2) and ( 4 ); it can make use of the broadband property of an optical signal. Moreover, improving function (1) is promising because high-speed processing can be achieved by optical analog processing such as multi-wavelength label processing [15] and optical code label processing [11].…”

Section: Introductionmentioning

confidence: 99%

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Prioritized Buffer Management in Photonic Packet Switches for Diffserv Assured Forwarding

Harai¹,

Murata

2003

Next Generation Optical Network Design and Modelling

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We study photonic packet switching architecture that enables a high node throughput and provides priority services in DiffServ (Differentiated Services). As we will show in this paper, a photonic packet switch can be equipped with an ultrahigh-speed address-lookup capability in the optical domain. However, the optical buffer must be managed in the electrical domain. In this paper, we investigate buffer management schemes with less complexity, such that the capability of the ultra-high-speed packet forwarding can be sustained in the photonic switch. We propose an implementation method for PBS (Partial Buffer Sharing) that provides DiffServ AF (Assured Forwarding). We show that PBS is applicable to single-stage optical buffer. Also, we propose a new buffer management method, called PBSO (PBS with Overwriting), which is applicable to broadcast-andselect-based single-stage optical buffer. PBSO is also applicable to the current space-switch-based single-stage optical buffer with an addition of a few optical components. The PBS and PBSO methods are based on a single queue and their complexities are 0(1) and O{p ), respectively, where pis the number oflevels of drop precedence. Through simulation study, we show that both methods provide different levels of drop precedence for DiffServ AF, and that PBSO improves buffer utilization and the packet loss probability of both drop-level packets.Keywords: Photonic packet switch, buffer management, partial buffer sharing with overwriting, single queue, DiffServ, level of drop precedence

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Optical switch dimensioning and the classical occupancy problem

Eramo

Listanti

Nuzman³

et al. 2002

Int J Communication

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SUMMARYResults for optical switch dimensioning are obtained by analysing an urn occupancy problem in which a random number of balls is used. This analysis is applied to a high speed bufferless optical switch which uses tuneable wavelength converters to resolve contention between packets at the output fibres. Under symmetric packet routing the urn problem reduces to the classical occupancy problem. Since the problem is large scale and the loss probabilities are small, exact analysis by combinatorial methods is problematic. As an alternative, we outline a large deviations approximation which may be generalised in various ways.

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WDM packet switch architectures and analysis of the influence of tunable wavelength converters on the performance

Cited by 164 publications

References 21 publications

Optical Packet Switch Architectures: A Comparative Study

Optical Packet Switch Architectures: A Comparative Study

Prioritized Buffer Management in Photonic Packet Switches for Diffserv Assured Forwarding

Optical switch dimensioning and the classical occupancy problem

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