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1 February 1990 Optical analog to digital converter using optical logic and table look-up
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The need for high performance analog to digital (AID) converters, the advantages of optics, and current approaches to AID conversion are reviewed. A novel method, for which a U.S. patent was recently awarded, is proposed that uses comparators, optical logic, and a table look-up to provide optical digital output from an optical analog input. The advantage of the new method is the ability to produce any digital code, optical input/ output, and longer word lengths at high speed. Implementations of the optical logic are proposed that use 1-D spatial light modulator devices under development, including self-electro-optic effect devices (SEEDs), double heterostructure optoelectronic switch (DOES) devices, and spatial light rebroadcasters (SLRs). Optical AID converters could make digital multiplication by analog convolution competitive with electronic systems.
Alastair D. McAulay "Optical analog to digital converter using optical logic and table look-up," Optical Engineering 29(2), (1 February 1990).
Published: 1 February 1990

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