Showing papers by "Esther Le Rouzic published in 2014"

Is it worth adapting sub-wavelength switching control plane to traffic variations?

Abstract: This paper proposes a novel Metropolitan Area Network (MAN) architecture called Multi-hEad sub-wavElength swiTching (MEET). Compared with the current architectures, MEET proposes to aggregate traffic using passive optical nodes instead of using electrical nodes (switches and routers). Several options regarding a potential control plane are compared in terms of resource allocation efficiency. Two options are relative to the burst assembly process whereas another option is relative to the dynamicity of the resource allocation process. Performance evaluation is carried out using a simulation platform fed by real traffic traces captured on a French operator's metropolitan network. The QoS delivered to three different classes of service has been assessed in terms of latency and jitter. Obtained results show that a control plane that does not adapt to short-term variations of the real traffic may provide QoS levels compatible with an operational MAN.

How problematic is Spectrum Fragmentation in operator's Gridless network?

Abstract: Spectrum Fragmentation (SF) is considered as a drawback of Gridless Technology (GT). In this paper, we study the impact of SF in a specific incremental traffic scenario and show to what extent anticipating traffic growth can reduce this impact and improves the spectrum usage for next generation of transponders. Numerical results indicate that SF is a real effect of GT but does not compromise GT advantages under specific circumstances.

Traffic forecast impact on spectrum fragmentation in gridless optical networks

Abstract: Gridless Technology increases the spectral efficiency of optical fiber transmissions, introducing however spectrum fragmentation. In this work, we show that traffic forecast permits to avoid spectrum fragmentation, even with an uncertainty of 10% on the growth rate.

First experimental demonstration of real-time orchestration in a Multi-head metro network

Abstract: We present for the first time the experimental demonstration of a Real-Time control-plane on the Multi-hEad sub-wavElength swiTching (MEET), Metro architecture. The key control assets are calculated and provided to the edge nodes in a form of grant files. These grant files eliminate the contention possibility at source nodes and destinations, thus they offer a lossless passive optical grooming and multiplexing/demultiplexing at the intermediate nodes. The experimental results validate the control plane structure designed based on a deterministic operating system well scalable for a regional metro network.

Energy saving in optical operator networks: The challenges, the TREND vision, and some results

Abstract: We discuss how to save energy in IP-over-WDM networks, presenting the vision of TREND, the FP7 NoE, and the saving that can be obtained with an adaptive routing solution that puts network interfaces of various granularities to sleep in periods of low traffic. Results refer to two operator networks, considering power and traffic forecasts for 2020.

Method for transmitting data in a time-domain wavelength-interleaved optical network

Abstract: The invention concerns, in particular, a method for transmitting data via an optical network (TWIN) comprising a plurality of optical nodes, in which at least one wavelength (λ2) is dedicated to the transmission, in the network, of data bursts transmitted by at least one of the nodes, called the source node (1S), to one of the nodes, called the destination node (2D), the method comprising the transmission (CTRL) of a control message (MC) from said destination node (2D) to the source node(s) (1S), the control message being transported in an optical signal transmitted according to said wavelength (λ2) dedicated to the transmission, in the network, of data bursts to the destination node.

Fine granular architecture for optical metro transport network

Abstract: Facing a tremendous IP traffic growth that does not bring significant revenues, ISPs need to improve network efficiency. They work with equipment manufacturers on solutions to improve synergies between the packet and the optical layer. If the available IP & Optical convergence solutions answer today's issues, they do not help handling the traffic pattern changes that Over The Top (OTT) players' content distribution strategy may induce. This paper proposes a fine granular packet transport architecture for optical Metro networks, which leverages on functions provided by Next Generation WDM (NG WDM) platforms, and Sub-Lambda Photonically Switched Networks (SLPSN) technology. The operation principles on which it is based have been demonstrated, and the features it relies on, already exist. Its implementation would only require a deeper standardization of the WDM layer and software developments. First results show remarkable improvement of the proposed solution in terms of bandwidth efficiency compared to classical IPoWDM.