Obiettivo The main objective of the KEOPS project is to define, develop and assess the concept of optical packet switching and routing networks capable of providing transparency to the payload bit rate, using optical packets of fixed duration with low bit rate headers, to simplify processing at the network/node interfaces. The feasibility of the KEOPS system concepts will be assessed by modelling, laboratory experiments, and testbed implementation of optical packet switch nodes, a network/node interfacing block and a fully equipped demonstrator.Network reference structureDemonstration of benefits of transparent optical packet layer within an all-optical network reference structure:* First conclusive results showing high transmission efficiency and traffic smoothing by an ATM/Optical Transparent Packet Interworking Unit with optical packet format defined in KEOPS;* Assessment of switching node performance and synchronisation schemes;* Exploitation of wavelength domain in network and switch node;* World state of the art performance of photonic devices and modules, successfully tested in KEOPS and OPEN trials;* Regenerative and bit rate transparent monolithically integrated interferometric all-optical wavelength converters (up to 40 GHz);* Fast optical gates operating over the whole EDFA range (16 channels at 10 Gb/s) using clamped gain SOAs;* Low insertion loss (6 dB), high speed electro-optic space switches;* Basic principles of the switch blocks explored up to 20 Gb/s and partial operation of interfacing block architectures (coarse and fine synchronizer) demonstrated;* Wavelength Routing Switch demonstrator now sufficiently equipped to demonstrate 4x4 wavelength-based packet routing at 2.5 Gb/s and 622 Mb/s real-time header recovery;* Demonstration of 160 Gb/s throughput with a sub-equipped 16x16 Broadcast-and-Select switch testbed. Cascadability of 8 network sections (50 km of DSF + 16x16 switch + regenerative interface) demonstrated at 2.5 Gb/s with low sensitivity penalty.Expected ImpactBy developing new key components for photonic switching, validating system concepts, and proposing new network concepts adapted to the customer needs (transparency to the bit rate), the KEOPS project will provide the fundamental basis for the introduction of packet switching techniques in the future transparent optical IBC network.Main contributions to the programme objectives:Main deliverablesOptical packet-switching in an all optical network.Contribution to the programmeDevelopment of a key basic technology for the future all-optical IBC network.Technical ApproachThe work is organized in three workpackage groups:* "Networks and Systems" undertakes studies on the network reference model, traffic analysis and switch node design, including modelling and specifications;* "Functional Sub-Blocks" provides advanced optoelectronic devices and modules required for system testbed implementation;* "System Demonstration" includes assessment of switching and interfacing blocks and demonstration of a transparent optical packet switch node.The system concepts employ switch architectures using photonic techniques (space and wavelength switching for routing and multiplexing, time switching using optical fibre buffers), to perform packet routing, multiplexing and buffering. Use of electronics is reserved for the switch control, where speed is not a limiting factor. The concepts are validated in experimental testbeds built from state-of-the-art photonic technology.Summary of TrialA demonstrator and testbeds will be implemented in a laboratory:* to assess the switching and interfacing blocks including packet synchronization (delineation and phase alignment);* to demonstrate and assess switching node architectures which provide for transparency to the payload bit rate, multicasting and cascadability.In addition, components from KEOPS will be used in the field trials of the ACTS OPEN project.Key Issues* definition and analysis of an optical network layered structure to handle high bit rate bursty traffic and to bridge the granularity gap, between the electrically switched capacity blocks and the transparent wavelength channels in the core network;* definition of the best packet format for transparent optical packets, using fixed packet load duration whatever the user defined load bit rate (e.g. 155 Mb/s to 10 Gb/s), and packet headers with a fixed and lower bit rate (155 or 622 Mb/s) to allow electronic processing;* traffic analysis and throughput performance evaluation at both the network and node levels;* specification of switch node architectures allowing for multicasting, cascadability, interoperability of the different architectures, and the design of network/node interfaces;* development of key components for use in both Optical Packet Switching and Optical Transport Networks;* fabrication of required advanced functional modules to experimentally demonstrate the KEOPS system concepts, based on fast optical routing in the wavelength/space domains and optical packet buffering for contention resolution;* delivery of components to the OPEN project for implementation in their field trials;* implementation of testbeds and a demonstrator operating at bit rates of 2.5 and 10 Gbit/s.Architecture of the Wavelength Routing Switch Demonstrator Campo scientifico engineering and technologyelectrical engineering, electronic engineering, information engineeringinformation engineeringtelecommunicationstelecommunications networksoptical networksnatural sciencesphysical sciencesopticsfibre optics Programma(i) FP4-ACTS - Specific programme of research, technological development and demonstration in the area of advanced communications technologies and services, 1994-1998 Argomento(i) 2 - Photonic technologies Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore Alcatel Alsthom Recherche Contributo UE Nessun dato Indirizzo Route de Nozay 91460 Marcoussis Francia Mostra sulla mappa Costo totale Nessun dato Partecipanti (8) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto ALCATEL SEL AG Germania Contributo UE Nessun dato Indirizzo LORENZSTRASSE 10 70435 STUTTGART Mostra sulla mappa Costo totale Nessun dato Alcatel CIT SA Francia Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato Centro Studi e Laboratori Telecomunicazioni SpA (CSELT) Italia Contributo UE Nessun dato Indirizzo Via Guglielmo Reiss Romoli 274 10148 Torino Mostra sulla mappa Costo totale Nessun dato EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH Svizzera Contributo UE Nessun dato Indirizzo RAEMISTRASSE 101 Mostra sulla mappa Costo totale Nessun dato France Télécom Francia Contributo UE Nessun dato Indirizzo 38-40 rue du Général Leclerc 92131 Issy-les-Moulineaux Mostra sulla mappa Costo totale Nessun dato TECHNICAL UNIVERSITY OF DENMARK Danimarca Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato UNIVERSITY OF BOLOGNA Italia Contributo UE Nessun dato Indirizzo Via Zamboni 33 40126 BOLOGNA Mostra sulla mappa Costo totale Nessun dato UNIVERSITY OF STRATHCLYDE Regno Unito Contributo UE Nessun dato Indirizzo G1 1XQ GLASGOW Mostra sulla mappa Collegamenti Sito web Opens in new window Costo totale Nessun dato