Future Optical Networks

O'Mahony, M.J.

doi:10.1109/contel.2007.381895

Cited by 28 publications

(33 citation statements)

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“…Optical packet switching-based paradigms have recently emerged as a result of a need to more efficiently utilize the fiber capacity using the recent advancements in photonic components [1,2]. In particular, two particular approaches have attracted the attention of researchers: optical packet switching (OPS) [3] and optical burst switching (OBS) [4].…”

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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“…We set the wavelength conversion delay to be a constant integer in [1,10]. We choose the 50% of all the nodes which have higher node degrees to be equipped with wavelength converters.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…Referring to the simulation model established in [17], we set the transmission delay on each link to be a small integer in [1,10], which is also in direct proportion to the length of the link. We set the wavelength conversion delay to be a constant integer in [1,10].…”

Section: Performance Evaluationmentioning

confidence: 99%

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A multipopulation parallel genetic simulated annealing-based QoS routing and wavelength assignment integration algorithm for multicast in optical networks

Cheng

Wang

Yang

et al. 2009

Applied Soft Computing

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In this paper, we propose an integrated Quality of Service (QoS) routing algorithm for optical networks. Given a QoS multicast request and the delay interval specified by users, the proposed algorithm can find a flexible-QoS-based cost suboptimal routing tree. The algorithm first constructs the multicast tree based on the multipopulation-parallel-genetic-simulated-annealing algorithm, and then assigns wavelengths to the tree based on the wavelength graph. In the algorithm, routing and wavelength assignment are integrated into a single process. For routing, the objective is to find a cost suboptimal multicast tree. For wavelength assignment, the objective is to minimize the delay of the multicast tree, which is achieved by minimizing the number of wavelength conversion. Thus both the cost of multicast tree and the user QoS satisfaction degree can approach the optimal. Our algorithm also considers load balance. Simulation results show that the proposed algorithm is feasible and effective. We also discuss the practical realization mechanisms of the algorithm.

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“…In [4], a historical look at the emergence of optical networking is taken, and the future of optical networking is discussed. We have recently surveyed all-optical multicasting over wavelength-routed WDM networks in [5], and recent comprehensive surveys on all-optical multicasting are given in [6] and [7].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Scalable Solution for All-Optical Multifiber Multicasting: SLAM

Köksal

Ersoy

2007

J. Lightwave Technol.

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Abstract-We previously proposed a mixed-integer linearprogramming formulation, solved by CPLEX, which is a stateof-the-art optimization tool, and two heuristic solutions, layered all-optical multicasting algorithm (LAMA) and conservative fiber and wavelength assignment (C-FWA), for all-optical multicasting in wavelength-routed multifiber wavelength-division multiplexed networks with sparse wavelength conversion and light-splitting restrictions. However, LAMA was not suitable for large and dynamic multicasting problems. In this paper, we evaluate and propose scalable layered all-optical multicasting (SLAM), which is a scalable version of LAMA, for any size static or dynamic multicasting problems. We demonstrate that SLAM performs very close to the optimal (the lower bound/CPLEX) and LAMA, and significantly better than the existing work and C-FWA in terms of nearly all metrics, including the session-and groupblocking probabilities (SBPs and GBPs), since it does not separate routing and fiber-wavelength assignment steps as compared to the other candidates like the existing work and C-FWA. Additionally, transmitter-optimized SLAM, which is a version of SLAM that is specifically tuned to minimize the number of transmitters used, spends three times less extra transmitters than SLAM, without a performance loss in other metrics (one extra transmitter for 12 multicast sessions). Therefore, the adjustable parameters of SLAM make it very flexible to balance different objectives.Index Terms-All-optic, multicast, multifiber, optic, sparse light splitting, sparse wavelength conversion, wavelength division multiplexing.

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Future Optical Networks

Cited by 28 publications

References 0 publications

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

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

A multipopulation parallel genetic simulated annealing-based QoS routing and wavelength assignment integration algorithm for multicast in optical networks

A Flexible Scalable Solution for All-Optical Multifiber Multicasting: SLAM

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