Julien Meuric

Bio: Julien Meuric is an academic researcher from Orange S.A.. The author has contributed to research in topics: Optical amplifier & Interoperability. The author has an hindex of 3, co-authored 6 publications receiving 31 citations.

Optical power control in translucent flexible optical networks with GMPLS control plane

Abstract: The continuously increasing traffic of Internet services (cloud services, video streaming, social networks, and recently, Internet of Things services) is leading to huge traffic growth in core optical networks. This traffic evolution is pushing network operators to efficiently exploit their infrastructures in order to postpone, as much as possible, the expensive deployment of new infrastructures. In this respect, the migration from fixed-to flex-grid optical networks was triggered in order to efficiently use optical network capacity, taking benefits from the improved spectral efficiency of flexible transponders. In our previous work [J. Opt. Commun. Netw., vol. 8, no. 8, p. 553, Aug. 2016], we demonstrated that migrating towards flexible networks while keeping in use existing optical amplifiers will cause a power saturation problem over highly loaded links due to the increase in the number of optical channels. To overcome this problem, we proposed in that work a power adaptation process that consists of converting transmission performance margins into optical power attenuation over optical links. However, the realized work considered only a transparent optical network controlled by the generalized multiprotocol label switching (GMPLS) protocol suite. In this paper, we consider the case of a translucent optical network where optical regeneration is required, and thus, the power adaptation process is adapted to this kind of network. A new routing algorithm and protocol extensions are proposed to take into account power and regeneration information in the GMPLS control plane of translucent networks.

Optical power control in GMPLS control plane

Abstract: The exponential traffic growth in optical networks has triggered the evolution from fixed-grid to flex-grid technology. This evolution allows better spectral efficiency and spectrum usage over current optical networks in order to facilitate huge dynamic traffic demands. The promise of flex-grid technology in terms of increasing the number of optical channels established over optical links, however, may not be sustainable because of the associated increase in optical amplification power. In this work, we detail a power control process that takes advantage of link optical power and channel optical signal-to-noise ratio (OSNR) margins to allow network operators to support this optical power increase while maintaining the use of legacy optical amplifiers. New generalized multiprotocol label switching (GMPLS) protocol extensions are proposed on which to integrate the optical power control process in the control plane. The performance of the process is evaluated in terms of the blocking ratio and network throughput over fixed-grid and flex-grid networks. Results show that controlling optical power benefits from the flex-grid technology in terms of spectrum and capacity gain and reduces optical connection blocking.

Alien wavelengths over optical transport networks

Abstract: To reduce network infrastructure cost, network operators want to integrate interoperable and open transponders, since these transponders allow application of the latest technologies over legacy networks at a competitive price This process of using third-party transponders in a given network is commonly called "alien wavelength" support Yet, moving toward interoperability raises several challenges: incompatible physical parameters, vendor lock-in, and proprietary software Manual set up of alien wavelengths has been demonstrated, but automating this process is essential to enable alien wavelength operation in the field This paper sheds light on the prevailing literature on the concept of alien wavelengths, taking into account many challenges that accompany the concept on its various levels We particularly focus on several approaches proposed in the literature: protocol message translation, controller cooperation, and open line systems, including our own proposals, an OpenROADM-based approach and a RSVP-TE-based approach We analyze these approaches with respect to several criteria: applicability to legacy equipment, added operational cost, and the offered level of interoperability and openness According to these characteristics, we note that, even though some non-interoperable approaches might be applicable to legacy equipment and easy to maintain, they remain infeasible with advanced alien scenarios (high level of interoperability) Finally, a combination has to be made between at least two of the given approaches in order to get the optimal solution

Interoperability Issues in Optical Transport Networks

Abstract: Integrating transponders enabling higher capacity and implementing the latest transmission technologies is a frequent process in the life-cycle of operational optical network in order to respond to the continuous traffic growth. Therefore, moving towards interoperable and open transponders is a priority target of operators in order to replace the mono-vendor supplying model by a more competitive multi-vendor model and, in consequence, reduce the infrastructure cost. This process, commonly called "alien wavelength" support, requires that the network management software be able not only to control the multi-vendor transponders, but also estimate lightpath performance. Standard sets of parameters and protocol extensions enable the use of vendor-agnostic open-source tools, avoiding vendor lock-in. This paper describes different interoperable solutions and discusses their efficiency based on a comprehensive set of criteria related to the complexity of deployment, applicability to legacy equipment, cost and level of openness and interoperability.

Demonstration of a MultiVendor Path Computation with Optical Feasibility Combining GMPLS and Open Source

Abstract: Openness and interoperability are a challenge in optical networks, especially when it comes to lightpath optical performance estimation. We propose to use a vendor-agnostic open-source tool and extend the OSPF-TE protocol with the required parameters.

Modeling and mitigation of fiber nonlinearity in wideband optical signal transmission [Invited]

Abstract: The adoption of open optical networks (OONs) requires the development of open and effective network planning tools, enabling the use of multi-vendor or white-box transport solutions. Such tools for studying and planning optical networks must be able to take into account the physical layer impairments, including fiber nonlinearity. The use of wideband wavelength division multiplexing in OONs, with channel frequencies extending across the short, conventional, and long bands and beyond, offers a pathway to increasing data rates through the installed fiber infrastructure. However, achievable information rates are limited by the resulting signal distortion due to fiber nonlinearity as signal bandwidths are increased, in particular, inter-channel stimulated Raman scattering (ISRS). In this paper, we describe the nonlinear effects observed in wideband transmission systems, and review recently developed analytical tools, based on the Gaussian noise (GN) model of nonlinear interference with the inclusion of ISRS. Using the ISRS GN model, we assess the impact of fiber nonlinearity on the achievable information rates in transmission systems with bandwidths of up to 12 THz. We demonstrate the use of the model in the optimization of launch power spectral profiles for a variety of dynamic gain equalizer arrangements in a 1000 km standard single-mode fiber link, using particle swarm optimization and the steepest descent algorithm. Such nonlinear models and optimization methods could be applied in OON planning tools, for example, in optical link emulators to estimate quality-of-transmission and data throughput, and in impairment-aware software-defined network control and management.

Power Managementin Mixed Line Rate Optical Networks

Abstract: We present a sensitivity study on how launch optical power can be managed to control the CAPEX of a mixed line rate (i.e., 10/40/100 Gbps wavelengths on same fiber) optical network.

Evolution of WDM Optical IP Networks : A Cost and Energy Perspective

Abstract: We review technologies and architectures for WDM optical IP networks from the viewpoint of capital expenditure and network energy consumption. We show how requirements of low cost and low energy consumption can influence the choice of switching technologies as well as the overall network architecture.

Open WiFi networks: Lethal weapons for botnets?

Abstract: This paper assesses the potential for highly mobile botnets to communicate and perform nefarious actions using only open WiFi networks, which we term mobile WiFi botnets. We design and evaluate a proof-of-concept mobile WiFi botnet using real-world mobility traces and actual open WiFi network locations for the urban environment of San Francisco. Our extensive simulation results demonstrate that mobile WiFi botnets can support rapid command propagation, with commands typically reaching over 75% of the botnet only 2 hours after injection—sometimes, within as little as 30 minutes. Moreover, those bots able to receive commands usually have ≈40–50% probability of being able to do so within a minute of the command being issued. Our evaluation results also indicate that even a small mobile WiFi botnet of only 536 bots can launch an effective DDoS attack against poorly protected systems. Furthermore, mobile WiFi botnet traffic is sufficiently distributed across multiple open WiFi networks—with no single network being over-utilized at any given moment—to make detection difficult.

Transparent vs Translucent Multi-Band Optical Networking: Capacity and Energy Analyses

Abstract: Multi-band optical fiber transmission is generally proposed for capacity upgrades in optical transport networks. To comprehensively assess the potential of multi-band transmission, key metrics such as the potential capacity increase, energy consumption, and the number of required interfaces must be evaluated for different transmission scenarios. We consider progressive spectral exploitation, starting from the C-band only and up to C+L+S+U-band transmission, for both transparent and translucent solutions that exploit optical signal regeneration. By considering accurate state-of-the-art physical layer models, we derive a networking performance metric that enables the comparison of different solutions in terms of capacity allocation and energy consumption. For a translucent network design, different regenerator placement algorithms are compared, with the aim of minimizing energy consumption. The proposed network-wide numerical analysis shows that, for spectral occupations exceeding the C+L-band, translucent solutions can significantly increase network capacity, while leading to a similar energy consumption per transmitted bit as in the transparent design case, but they require the deployment of additional line interfaces. Significantly, these results provide evidence that the transparent exploitation of an additional transmission band produces a capacity increment that is at least comparable to that of a translucent solution based on already-in-use bands. Since this is attained at the expense of fewer line interfaces, it is a key finding suggesting that extending the number of bands supported is a cost-effective approach to scaling the capacity of existing fiber infrastructures.