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Sending large amounts of information down an optical fibre is done by encoding many separate streams of data as pulses of light of different colours, so that they can travel along the fibre without interfering with each other.
ECONOMIST: Optical fibres could carry more information in the future
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Optical correlators, meanwhile, work by encoding images on to a beam of light and, using a special lens, transforming them into their Fourier components building-blocks that encode the thickness and direction of lines in the image, but not their position.
ECONOMIST: Optical recognition
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It has a proprietary system for encoding 2D and 3D video using occlusion, which is delivered to standard panels that have been retrofitted with its optical glass sandwich to bring the spec-less 3D illusion to viewers.
ENGADGET