Transparent optical packet switching: network architecture and demonstrators in the KEOPS project

Gambini, P.; Renaud, M.; Guillemot, C.; Callegati, Franco; Andonović, Ivan; Bostica, B.; Chiaroni, D.; Corazza, Giovanni Emanuele; Danielsen, S.L.; Gravey, Philippe; Hansen, Per Christian; Henry, M.; Janz, C.; Kloch, A.; Krahenbuhl, R.; Raffaelli, Carla; Schilling, Michael; Talneau, A.; Zucchelli, L.

doi:10.1109/49.725193

Cited by 256 publications

(104 citation statements)

References 18 publications

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“…In particular, two particular approaches have attracted the attention of researchers: optical packet switching (OPS) [3] and optical burst switching (OBS) [4]. A significant amount of research and experimentation has been carried out in the last decade on optical packet/burst switching [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

et al. 2010

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a b s t r a c tThis paper compares four different architectures for sharing wavelength converters in asynchronous optical packet switches with variable-length packets. The first two architectures are the well-known shared-per-node (SPN) and shared-per-link (SPL) architectures, while the other two are the shared-per-input-wavelength (SPIW) architecture, recently proposed as an optical switch architecture in synchronous context only, which is extended here to the asynchronous scenario, and an original scheme called shared-per-output-wavelength (SPOW) architecture that we propose in the current article. We introduce novel analytical models to evaluate packet loss probabilities for SPIW and SPOW architectures in asynchronous context based on Markov chains and fixed-point iterations for the particular scenario of Poisson input traffic and exponentially distributed packet lengths. The models also account for unbalanced traffic whose impact is thoroughly studied. These models are validated by comparison with simulations which demonstrate that they are remarkably accurate. In terms of performance, the SPOW scheme provides blocking performance very close to the SPN scheme while maintaining almost the same complexity of the space switch, and employing less expensive wavelength converters. On the other hand, the SPIW scheme allows less complexity in terms of number of optical gates required, while it substantially outperforms the widely accepted SPL scheme. The authors therefore believe that the SPIW and SPOW schemes are promising alternatives to the conventional SPN and SPL schemes for the implementation of next-generation optical packet switching systems.

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Section: Introductionmentioning

confidence: 99%

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

et al. 2010

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“…Consequently, the demand size vector is n = (1, 4,8). If the slot width is doubled, then the new demand size vector becomes n = (1, 2, 4).…”

Section: Assumptionsmentioning

confidence: 99%

“…The issues described above related to the need for more efficient bandwidth sharing, are addressed by packet switching-based optical technologies, for example Optical Packet Switching (OPS) and Optical Burst Switching (OBS) [4][5][6]. However, such technologies are generally viewed as longer term solutions due to the lack of practical optical buffers and high costs of wavelength converters that are needed for acceptable bandwidth efficiency in OPS or OBS.…”

Section: Introductionmentioning

confidence: 99%

Analytical performance modeling of elastic optical links with aligned spectrum allocation

Vaezi

Akar

2015

Computer Networks

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a b s t r a c tElastic optical networking has recently been proposed for use in optical transport networks to cope with increasingly heterogeneous and dynamic demand patterns. In this paper, we study the blocking performance of a multi-class elastic optical link for which a demand needs to be allocated a contiguous subset of the entire spectrum. This problem is different than the well-known blocking problem in multi-class multi-server loss systems due to the contiguous allocation constraint. We first propose a non-work-conserving aligned spectrum allocation policy which is shown to outperform the conventional first fit-based work-conserving allocation policy without alignment. Subsequently, for blocking performance of an aligned elastic optical link with up to three different traffic classes, we propose a novel and systematic order reduction procedure for MMPPs (Markov Modulated Poisson Process) and use this procedure as the numerical engine to approximately obtain the blocking probabilities. The proposed numerical algorithm is validated under various system and traffic parameters and is shown to be effectively usable as an instrument to dimension elastic optical links.

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“…Two packet-based optical switching paradigms have recently been introduced to make more efficient use of bandwidth (as opposed to circuit-based networks): Optical Packet Switching (OPS) [1] and Optical Burst Switching (OBS) [2]. In this paper, we study the performance of an optical packet/burst switch employing full/limited range share per node wavelength conversion.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of an Optical Packet Switch Employing Full/Limited Range Share Per Node Wavelength Conversion

Akar

Karasan

Muretto³

et al. 2007

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference

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Abstract-In this paper, we study an asynchronous optical packet switching node equipped with a number of limited range or full range wavelength converters shared per node. The packet traffic is realistically modeled by a superposition of a finite number of on-off sources as opposed to the traditional Poisson model which ignores the limited number of ports on a switch. We both study circular and non-circular limited range wavelength conversion schemes. In our simulations, we employ the far conversion policy where the optical packet is switched onto the farthest available wavelength in the tuning range, which is known to outperform the random conversion policy. We propose an approximate analytical method based on block tridiagonal Markov chains and fixed point iterations to solve for the blocking probabilities in share per node wavelength conversion systems. The method provides an accurate approximation for full range systems and acceptable results for limited range systems.

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Transparent optical packet switching: network architecture and demonstrators in the KEOPS project

Cited by 256 publications

References 18 publications

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

Analytical performance modeling of elastic optical links with aligned spectrum allocation

Performance Analysis of an Optical Packet Switch Employing Full/Limited Range Share Per Node Wavelength Conversion

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