Optical: systems and elements – Optical computing without diffraction
Patent
1994-02-04
1995-08-29
Lerner, Martin
Optical: systems and elements
Optical computing without diffraction
359108, 359117, 359125, 359188, 375282, 375333, 385 16, G02F 200, G02F 300, H04L 2710, H04Q 1100
Patent
active
054465710
ABSTRACT:
An optical code recognition unit (OCRU) for recognising a predetermined n-bit optical code sequence coded using the Manchester code format, has an n-way splitter (7) having an input and n parallel outputs (7a). A plurality of gates (9a, 9b, 9c, 9d) are associated with the splitter outputs (7a), respective pairs of splitter outputs leading to each of the gates ( 9a, 9b, 9c) via a respective optical combiner (8a, 8b, 8c), and any remaining single splitter output leading directly to its gate (9d). Each of the splitter outputs (7a) is subject to a different delay of m half bit periods, where m=0 to 2(n-1), the values of m being chosen such that, if a predetermined optical code sequence is applied to the splitter input, the `1`s in the outputs of each of the pairs of splitter outputs (7a) reach the associated AND gates (9a, 9b, 9c) and the `1` in any remaining single splitter output (7a) reaches its AND gate (9d) at predetermined times such that all the gates are turned on.
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British Telecommunications plc
Lerner Martin
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