Christian Gaumier

Christian Gaumier received his Ph.D. from EPFL in 1995. His doctoral research focused on modelling the propagation of signals over singlemode fibres in both linear and nonlinear regimes. His research area includes dispersion compensation techniques, measurement techniques for fiber optics and dimensioning and performance analysis of core photonic communication networks. He participated to several European joint projects and is author and co-author of more than 50 publications in conferences, journals and books.

Dr. Gaumier is member of Communication Society of IEEE.

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Situate and evaluate the potentialities, limits and perspectives of optical communication systems and networks. Design and dimension of photonic communication systems and networks

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Energy saving perspectives of IP over wavelength division multiplexing

Christian Gaumier, Sébastien Rumley

The electrical consumption of the core global networks is becoming preoccupant. To reduce it, one may bet on technological advances improving the energetic profile of individual components. However, large energy savings can potentially already be achieved, by reviewing the organization of the core networks. In this paper, we sketch directions which can be followed to improve the network organization toward reduced energetic consumption.

Institut de Recherche en Informatique de Toulouse2011

Multi-objective optimization of regenerator placement using Constraint Programming

Christian Gaumier, Sébastien Rumley

In translucent optical networks, connections bypass most intermediate nodes transparently. However, their signal quality is affected by the traveled distance and/or the bypass operations. Hence, they might require optical-electrical-optical conversions at some intermediate nodes, in order to regenerate the carried signal. In this paper, we evaluate several approaches to deal with connection routing and regenerator placement within a translucent network. We present our Constraint Programming based multi-objective optimization model which accepts three criteria: total routing cost, total number of regeneration operations, and number of nodes performing regeneration. Our results show that this approach provides solutions in a reasonable running time for problem instances of practical interest. We discuss our method in the context of the state-of-the-art and show that optimization based on one criterion only misses the possibility to improve the solution in respect to the other aspects. © 2011 IFIP.

2011

Performance overview of the quasi-synchronous operation mode in optical burst switching (OBS) networks

Christian Gaumier, Oscar Pedrola Escriba, Sébastien Rumley

Optical burst switching (OBS) is able to operate under both asynchronous and synchronous burst departures. Although the asynchronous approach is generally assumed in OBS owing to its simplicity and low technical requirements, it has been shown that performance improvements, in terms of the overall burst loss probability, can be achieved under synchronous operation. Moreover, when effective contention resolution mechanisms are applied, such improvements are significant. Since perfect synchronization is not a viable solution, we propose a novel operation mode with relaxed technical requirements, the quasi-synchronous (QS) operation. In this paper, the performance of the QS operation mode is evaluated by an exact analytic expression, assuming a Poisson burst arrival process and a single-wavelength scenario. This mathematical analysis is completed with numerical results that validate its accuracy. Furthermore, we tackle the issue of not having well-aligned clock information between network nodes by proposing a novel re-synchronization mechanism for OBS networks. Finally, a performance study of the QS operation under different deflection routing techniques is presented. The results show that our novel QS approach achieves significant performance benefits with respect to the asynchronous operation while avoiding the architectural complexity of the synchronous scheme.

2011

Computer network

A computer network is a set of computers sharing resources located on or provided by network nodes. Computers use common communication protocols over digital interconnections to communicate with eac

Routing

Routing is the process of selecting a path for traffic in a network or between or across multiple networks. Broadly, routing is performed in many types of networks, including circuit-switched networks

Input/output

In computing, input/output (I/O, i/o, or informally io or IO) is the communication between an information processing system, such as a computer, and the outside world, possibly a human or another inf

Situate and evaluate the potentialities, limits and perspectives of optical communication systems and networks. Design and dimension of photonic communication systems and networks

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