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Code: EP119

Description

The interconnection problem is solved at circuit board level by spatial optics. This comprises transmission or reflection mode modulators to send output signals, alternated with optical substrates containing computer-generated optical components to perform fan-out or focussing to control many parallel paths from one layer to the next. Hence a powerful and compact processor can be achieved. The lecture considers the alternatives of reflection and transmission mode architectures and how these may be applied to configure a switch. A second type of information processor that is highly interconnected is the neural network, where the "program" is the learned set of interconnections. Components for spatial interconnect include the multi-quantum-well modulator array (illustrated by an example), holographic fan-out by means of a computer generated hologram (illustrated by diagrams and a demonstration). A location video sequence of a neural network being trained is also included. Thus there are in existence more than one technique of interconnection with spatial optics.