Illustration of a chip-scale optical abacus with integrated optical waveguides. The memory cells are located at the crossings. The abacus is shown for demonstration - the colours of the digits are reflected in four of the memory cells.
Researchers at the universities of Münster, Exeter and Oxford have developed a miniature "abacus" which can be used for calculating with light signals. With it they are paving the way to the development of new types of computer in which, as in the human brain, the computing and storage functions are combined in one element - in contrast to conventional computers, in which the two are separated in line with the so-called Von Neumann Principle. The study has been published in the latest issue of the journal "Nature Communications". "In the article we describe for the first time the realization of an abacus which operates in a purely optical way," explains Prof. Wolfram Pernice from the Institute of Physics at Münster University who lead the team. "Instead of having wooden beads on a wire, our abacus counts light pulses and stores them in a phase-change material such as is used for rewriteable DVDs." The optical abacus is installed on a microchip and can be easily manufactured. Using integrated photonic circuits the researchers can store data on it, read the data, and do all the basic arithmetical operations with it. So far, the researchers have succeeded in calculating with two-digit numbers using two photonic phase-change cells, but the extension to large multi-digit numbers simply involves the use of more cells.
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