Obiettivo Parallel optoelectronics may offer solutions to data flow bottlenecks that arise in applications such as in telecommunication and computer networks, memories and recognition systems. The aim of POPAM is to demonstrate the scaleablity, compactness and integrability potential of parallel optoelectronics technologies in the context of an updatable holographic memory.Devices and materials are being developed for parallel optoelectronic system applications. The devices are being integrated into a holographic memory demonstrator that is reconfigurable with high storage capacity and fast access and which can be dynamically updated. The memory will test the scaleability, compactness and integration of the device technologies. A basis dynamic memory system has been designed and built. Several images have been stored in a photorefractive crystal and recalled at high speed using a phase encoded reference beam. The phase encoded reference beam is derived using a custom spatial light modulator illuminated by an diffractive optical array generator. The demonstrator is being refined as optimized components become available. Procedures for fabricating diffractive optical elements by electron beam lithography and reactive ion etching are continuously being improved and the first trials of replication by excimer machining are taking place. High quality bacteriorhodopsin films have been prepared. The potential use of their strong nonlinear optical properties to provide the nonlinear functions needed in the memory is being assessed. Progress is also being made on photorefractive image amplifiers and on the design and fabrication of an optically addressed spatial light modulator which may find use in all optical approaches to dynamic memory refreshing.APPROACH AND METHODS The consortium brings together complementary skills in optical information processing systems, diffractive optics, spatial light modulators, and real time holographic devices and materials. A holographic memory is being implemented that is reconfigurable with a high storage capacity and fast access. Dynamic updating will be achieved by adding a feedback loop. The optical components needed are being studied and developed within the project. The formatting and manipulation of information in the form of optical beamlet arrays is being achieved using computer generated holograms in conjunction with spatial light modulators and real time holograms. Existing masking and etching facilities for the fabrication of computer generated holograms are being improved and direct excimer laser micromachining of components investigated. A novel high resolution optically addressed spatial light modulator is being developed and bacteriorhodopsin is being studied as an alternative to the photorefractive materials used in the demonstrator. POTENTIAL The knowledge gained from the device and system development will allow the assessment of the potential for densely interconnected compact parallel optoelectronic solutions to information processing problems. Opportunities exist for spin-offs in communications network space switching, pattern recognition and neurocomputing hardware. Campo scientifico natural sciencesphysical scienceselectromagnetism and electronicsoptoelectronicsengineering and technologymechanical engineeringmanufacturing engineeringsubtractive manufacturingengineering and technologyelectrical engineering, electronic engineering, information engineeringinformation engineeringtelecommunicationstelecommunications networksnatural sciencescomputer and information sciencesartificial intelligencepattern recognitionnatural sciencescomputer and information sciencesdata sciencedata processing Programma(i) FP3-ESPRIT 3 - Specific research and technological development programme (EEC) in the field of information technologies, 1990-1994 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore KING'S COLLEGE LONDON Contributo UE Nessun dato Indirizzo Strand LONDON Regno Unito Mostra sulla mappa Costo totale Nessun dato Partecipanti (5) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Centre National de la Recherche Scientifique Francia Contributo UE Nessun dato Indirizzo 91403 Orsay Mostra sulla mappa Costo totale Nessun dato FORTH RESEARCH CENTER OF CRETE Grecia Contributo UE Nessun dato Indirizzo , 1527 71110 HERAKLION Mostra sulla mappa Costo totale Nessun dato RISOE NATIONAL LABORATORY Danimarca Contributo UE Nessun dato Indirizzo , 49 4000 ROSKILDE Mostra sulla mappa Costo totale Nessun dato TECHNISCHE HOCHSCHULE DARMSTADT Germania Contributo UE Nessun dato Indirizzo Alexanderstraße 24 64283 DARMSTADT Mostra sulla mappa Costo totale Nessun dato THOMSON CSF Francia Contributo UE Nessun dato Indirizzo DOMAINE DE CORBEVILLE 91404 ORSAY Mostra sulla mappa Costo totale Nessun dato