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Research in optical information technology in Europe has§been very active inrecent years. This volume records§state-of-the-art research conducted in some 22 laboratories§who have worked together within EC ESPRIT Basic Research§Action 3199 up to 1992. The topics cover:§(1) Active optical logic and switching devices - embracing§new materials, nonlinear and electrooptic mechanisms as well§as advanced device fabrication. These devices cover the§range from all-optical nonlinear interferometer structures§through hybrid optical-electronic modulators to integrated§emitter-receiver structures.§(2) The latest state of optical interconnect technology,§embracing diffractive optics (binary and multi-level phase§gratings), holographic space-variant elements and§micro-refractive optics.§(3) Contributions on optical information processing§architecture and demonstrator projects. The materials base§ranges from silicon to II-VI materials with the realisation§of pn-junction devices in ZnSe.§The research reported here lays the basis for long-term§progress in devices for information processing.