Lightness Low latency and high throughput dynamic network infrastructures for high performance datacentre interconnects

November 2012 – October 2015

The main objective of the LIGHTNESS project is the design, implementation and experimental evaluation of a high-performance network infrastructure for data centres, where innovative photonic switching and transmission solutions are deployed. Harnessing the power of optics will enable data centres to effectively cope with the unprecedented demand growth to be faced in the near future, which will be driven by the increasing popularity of computing and storage server-side applications in the society. Indeed, the deployment of optical transmission systems leveraging Dense Wavelength Division Multiplexing (DWDM) allows the transmission of more than a hundred of wavelength channels operating at 10, 40, 100 Gb/s and beyond. This effectively results in “unlimited” bandwidth capacities of multiple Terabit/s per fibre link, which can be efficiently utilized through next-generation all-optical switching paradigms like Optical Circuit Switching (OCS) or Optical Packet Switching (OPS). In this context, LIGHTNESS will join efforts towards the demonstration of a high-performance all-optical hybrid data plane for data centre networks, combining both OCS and OPS equipment to implement transport services tailored to the specific applications’ throughput and latency requirements. To this goal, an OPS node suitable for intra- data centre connectivity services will be developed and prototyped during the project, together with an enhanced Top of the Rack (TOR) switch seamlessly connecting servers in each rack to the hybrid OCS/OPS inter-cluster network. As an additional achievement of LIGHTNESS, the OCS/OPS inter-cluster network will be empowered with a network control plane able to dynamically provision flexible connectivity services in the hybrid OCS/OPS data centre network. Such a control plane will also be developed and prototyped for integration in the final LIGHTNESS demo throughout the project.

Enhanced opticaL networks featuring Adaptable and highly Scalable multi-granular Transport servICes (ELASTIC)

January 2012 – December 2014

The ELASTIC project will pursuit the design and assessment of novel network architectures offering multi-service provisioning features as well as to effectively respond to a variety of upper layer application requirements. As the starting point, multi-layer Internet Protocol / Multi-Protocol Label Switching (IP/MPLS) over Wavelength Switched Optical Network (WSON) networks will be firstly analyzed as a cost-effective solution to provide high utilization of the optical layer bandwidth by means of electrical grooming. Cost reduction here will be maximized through the proposal of multi-layer optimization methods to achieve optimal network performance using the minimum number of resources. Moreover, multi-layer protection and restoration mechanisms will also be designed in such networks, upgrading them with the reliability needed to support future transport services under a cost-effective and low-energy-consumption policy. In fact, the omnipresence of Internet around the Globe will force network operators to interconnect with each other following the mission to successfully provide universal connectivity to their customers. In such scenario, operators will likely deploy their switching technologies of choice, opening new challenges on the efficient provisioning of end-to-end services across multiple heterogeneous domains. This problem will be addressed in the ELASTIC project as well, proposing solutions for improved inter-domain path computation in both single-layer (i.e., all domains implement the same switching technology) and multi-layer multi-domain scenarios. Such proposed solutions will be particularly defined to properly fit the Internet Engineering Task Force (IETF) Path Computation Element (PCE) framework, thus maximizing its options of being adopted in future multi-domain networks. It is widely accepted that optical transmission rates will go far beyond 100 Gbps along the next decade. In this context, the ELASTIC project will deepen on the analysis of advanced modulation formats, like Quadrature Amplitude Modulation (QAM), to determine the candidates for enabling the next 400 Gb/s or 1 Tb/s standards. Furthermore, digital signal processing, in the context of digital optical coherent receivers, will be a key stone to be addressed. In any case, this migration will not happen overnight but most likely in a gradual fashion. Therefore, mixed transmission bit-rates will have to seamlessly coexist in the mid-term optical networks. An enabling technology for these variable bit-rate communications is the Optical Orthogonal Frequency Division Multiplexing (OOFDM), which provides the potentiality of dynamically adapting the transmission speeds according to current network conditions. In this regard, the ELASTIC project will focus on the cost-effective operation of OOFDM networks by proposing novel Routing and Spectrum Allocation (RSA) and survivability mechanisms. Furthermore, innovative multi-granular node architectures capable of switching at different granularities (packet, burst, circuit, etc.) and at different bit-rates, will be designed. These advanced multi-granular nodes will also be equipped with an interoperable GMPLS-based common control plane solution, able to seamlessly drive all switching layers in a unified way, while providing at the same time the interoperability to fit in heterogeneous multi-domain network environments. The ELASTIC project will also address network virtualization, which enables breaking a physical network into multiple isolated and personalized virtual networks matching specific service needs. In particular, the study will concentrate on the management of both physical and virtualized layers from a GMPLS-enabled common control plane. Finally, inside the ELASTIC project the available multi-degree Reconfigurable Optical Add-and-Drop Multiplexers (ROADMs) will be enhanced with monitor devices (i.e., Optical Signal to Noise Ratio (OSNR) and bit error rate (BER) monitors). These monitors will inform the GMPLS control plane with the current optical layer measurements towards a fully compliant Impairment Aware (IA) GMPLS-based optical network.

Euler Experimental UpdateLess Evolutive Routing

October 2010 – June 2014

The main objective of the EULER exploratory research project is to investigate new routing paradigms so as to design, develop, and validate experimentally a distributed and dynamic routing scheme suitable for the future Internet and its evolution. The resulting routing scheme(s) is/are intended to address the fundamental limits of current stretch-1 shortest-path routing in terms of routing table scalability but also topology and policy dynamics (perform efficiently under dynamic network conditions). Therefore, this project will investigate trade-offs between routing table size (to enhance scalability), routing scheme stretch (to ensure routing quality) and communication cost (to efficiently and timely react to various failures). The project will develop appropriate tools to evaluate the performance of the proposed routing schemes on large-scale topologies (order of 10k nodes). Prototype of the routing protocols as well as their functional validation and performance benchmarking on the iLAB experimental facility and/or virtual experimental facilities such as PlanetLab/OneLab will allow validating under realistic conditions the overall behaviour of the proposed routing schemes.

Strongest Scalable Tunable and Resilient Optical Networks Guaranteeing Extremely-High Speed Transport (STRONGEST)

January 2010 – December 2012
INFSO-ICT 247674

STRONGEST’s main goal is to design and demonstrate an evolutionary ultra-high capacity multilayer transport network, based on optimized integration of optical and packet nodes, and equipped with a multi-domain, multi-technology control plane, overcoming the problems of current networks that still provide limited scalability, are not cost-effective and do not properly guarantee end-to-end quality of service. STRONGEST is an industry led project; the consortium brings together major European industrial players, leading Telecom operators, Universities and Research Centres and as such, it enables the necessary synergies and creates an ideal environment for innovation and development. The European scale of the project is made necessary by the development of a new reality in which countries and federations are immensely and inextricably linked. To have a common view at European level is essential to apply the project’s outcomes. A major impact from STRONGEST will be to strengthen the position of European industry in the field of Future Internet and to reinforce European leadership in optical networks technologies. The design of a more efficient transport network with reduced cost per bit and the particular attention to energy efficiency will turn into benefit to the entire Community. Network Operators have a tough target to reduce CO2 emissions, whilst at the same time supporting significantly higher information bandwidth. They will use the results of STRONGEST, which will provide the optimum transport network architecture to achieve these targets. STRONGEST results will be exploited by Vendors to develop traffic engineering solutions running in multi-technologies and multi-domain context, and the related control plane in both legacy nodes and new optical/packet nodes. Academic Partners plan to use the STRONGEST results for further enhancement of knowledge transfer, and training and skills creation in the field of telecommunication networks, particularly in the field of optical networks.

Fierro Future Internet: Eficiencia en las redes de altas prestaciones

May 2011 – September 2012

The mismatches in the design objectives between the original and the future Internet avoid its widespread deployment at the expected scales. The challenges with regard to the high-performance IP (metro and core) network infrastructure involve all the layers: physical layer and switching technologies, traffic engineering, control and management, etc. The goal of this Thematic Network aims at building a platform to create synergies and close collaboration among the different Spanish groups with expertise in the Internet topic.

ENGINE: “Engineering Next Generation Optical Transport NEtworks”

January 2009 – December 2011

One of the objectives of the ENGINE (Engineering Next Generation optIcal traNsport nEtworks) project will be the upgrade of the ROADM nodes we developed in the framework of the “Red INteligente GMPLS/ASON con Integración de Nodos reconfiGurables (RINGING)” project (TEC-2005-08051-C03-02) to enable transmissions at 10 Gb/s and beyond (40-100 Gb/s). Nevertheless, the leap from 10 Gb/s to higher bit rates poses some technical problems which have to be properly investigated. Typically, when transmission speed is increased, marginal impairments such as polarization mode dispersion (PMD) become pronounced, limiting the transmission distance without signal regeneration. Therefore, another objective of the ENGINE project is also to develop and integrate in the ROADM node, modules for optical signal regeneration, chromatic (CD) and polarization-mode dispersion (PMD) compensation, in combination with wavelenght conversion (WC) techniques. On the other hand, most operators are seeing the control plane as the key factor to migrate from ring-based to meshed-based optical transport network. To migrate, thus, our experimental platform to a mesh topology, another objective of the ENGINE project will be the implementation, starting from the ROADMs, of Optical Cross Connect (OXC) nodes.In such high-capacity reconfigurable optical transport networks, the control plane must manage efficiently available wavelenghts as well as to react in case of degradation of the optical signals due to the physical impariments arisen from the propagation through the optical fibers. In the latter case, the control plane dynamically drops the degraded channels in order to regenerate the signal or to compensate the dispersion. To accomplish to this functionality, therefore, it is of critical value to efficiently monitor the accumulated physical impairments. In this context, another objective of the ENGINE project is to design and demonstrate monitoring techniques for CD and PMD. Moreover, if a 40 Gb/s (and beyond) signal has to travel through DWDM 50 GHz spaced channels, a lot of inter-symbol interference will raise. Multilevel modulation formats reduce the symbol rate and therefore alleviate the influence of impairments while advanced modulation formats together with digital signal processing-enhanced optics will make 40 Gb/s systems possible. In ENGINE, we will investigate on electronic digital signal processing as well as all-optical PMD compensation.The ENGINE project will also design and evaluate routing and wavelenght assignment algorithms which take into account the physical impairments to decide how to accomodate the connection requests triggered from the client networks (IP, SDH, Ethernet, etc.). Such algorithms will be tested over the experimental platform (arising from the RINGING project and completed accomplishing the previous objectives of ENGINE). Assuming that a network must be seen in its overall structure, which means to consider not just the transport layer but also the client networks. The ENGINE project will carry out interwoking studies aimed, firslty, to design efficient dynamic traffic grooming strategies to optimize the bandwidth utilization of the wavelenghts; and secondly, to design coordinated protection strategies between transport and client layers in order to cover a wide set of failures which can occur. In both cases, an MPLS over optical transport layer will be assumed and the designed startegies will be experimentally evaluated. Finally, the potentiality of GMPLS-based control plane to efficiently manage the network resources for hybrid Optical Circuit Switching (OCS) and Optical Burst Switching (OBS) network nodes will be investigated, since OBS networks, capable of switching smaller granularities than wavelenghts in the optical layer, are seen as the long-term solution for optical networks.

Bone Building the future optical network in Europe

January 2008 – February 2011

The BONE-proposal builds on the foundations laid out by the e-Photon/ONe projects in the previous Framework Programme. This Network of Excellence has successfully brought together over several years the research activities within Europe in the field of Optical Networks. The BONE-project intends to validate this effort by stimulating a more intensified collaboration, exchange of researchers and building on Virtual Centres of Excellence that can serve to European industry with education & training, research tools & testlabs and pave the way to new technologies & architectures.

Diconet Dynamic impairment constraint network for transparent mesh optical networks

January 2008 – June 2010

The DICONET project is targeting a novel approach to optical networking providing a disruptive solution for the development of the core network of the future. It is the vision and goal of our consortium to provide ultra high speed end-to-end connectivity with quality of service and high reliability through the use of optimised protocols and routing algorithms that will complement a flexible control and management plane offering flexibility for the future network infrastructure. We plan to investigate, design, implement and test new routing and wavelength assignment algorithms considering as constraints physical impairments that arise in transparent core networks. These algorithms will be incorporated into a novel dynamic network planning tool that would consider dynamic traffic characteristics, varying physical impairment and component characteristics and a reconfigurable optical layer. The use of this novel planning tool in conjunction with proper extensions to the control plane of core optical networks that will be designed, implemented and tested by our consortium will make possible to realize the vision of transparency, while offering efficient resource utilization and strict quality of service guarantees based on certain service level agreements. The combinations of the tools, algorithms and protocols that will developed by the uniquely qualified DICONET consortium together with new technologies and architectures that will be considered as enablers for the network of the future will assist in overcoming the expected long term limitations of current core network capabilities. The DICONET scope and objectives, address dynamic cross-layer network planning and optimization while considering the development of a future transport network infrastructure which ensures fail-safe network configuration and operation. Our approach will greatly contribute as a basic element in achieving resilience and transparency of the Future Internet.

Red inteligente GMPLS/ASON con integración de nodos reconfigurables (RINGING)

January 2006 – December 2008

The RINGING subproject concerns the design and building of a reconfigurable optical node with an advanced design, and its further integration into a real network to develop a field trial. The main objective of this subproject is the integration of reconfigurable optical nodes in the GMPL/ASON network, which has been obtained as a result of the CARISMA project. Thanks to the participation in TRIPODE, CARISMA, and FIRM (Field trial with Integrated ROADMs and GMPLS compliance, the CELTIC-EUREKA-2004 project, projects, the know-how necessary for the implementation of the reconfigurable optical nodes is ready. The subproject is divided in two main blocks. The first one will be dedicated to building reconfigurable optical nodes, while in the other, the aspects of the integration of these nodes in an optical network which was constructed during the CARISMA project, will be treated. Introduction of the traffic engineering (TE) techniques into GMPLS/ASON networks, which will result in a network able to provide optical virtual private networks (OVPN) as well as suitable for working in a GRID environment of great importance in the next future, should be highlighted among the most important general objectives of this subproject. For the development of these last objectives also the participation in PROMISE (Provisioning and monitoring of optical services, CELTIC-EUREKA-2004 project) project will be useful.

COST291 Towards Digital Ooptical Networks

July 2004 – June 2008

The COST 291 Action ‘Towards digital optical networks’ belongs to the COST Domain: Telecommunications Information Science and Technology. The primary objective of this action is to focus on novel network concepts and architectures exploiting the features of photonic technologies, to enable future broadband telecommunications networks (access, metro and core). It is aiming to propose a new generation of systems and networks that will accommodate the unpredictable growth of data traffic. The action was initiated by the ‘High-speed networks and optical communications’ group of AIT and Prof. Ioannis Tomkos acts as Action Chairman. More than 28 partners contribute to the activities of the project (including several from new member states).