title: Optical digital comparison unit for equal-to, less-than, and greater-than determination.
abstract: A number of nonnumerical processing applications, including database management, full text search, and pattern recognition rely heavily on digital comparisons. The development of massive-capacity optical memories coupled with the high speed and parallelism of optics have led to the investigation of optical techniques for nonnumerical processing. This paper proposes a system design for an optical comparator capable of performing multiple equal-to, less-than, and greater-than comparisons between pairs of binary words. The comparator consists of three two-dimensional arrays of optical elements based on a new optical logic device called the light-amplifying optical switch. The first two stages contain inverters, NOR gates, and flip-flops, while the third stage is a custom-designed winner-takes-all network. With a compact design and with small high-speed devices a comparator with 2.5 × 10(4) pixels could theoretically attain a processing rate of approximately 4 × 10(10) 16-bit word comparisons/s.
authors.forename: P A
authors.initials: PA
authors.lastname: Mitkas
authors.forename: S A
authors.initials: SA
authors.lastname: Feld
authors.forename: F R
authors.initials: FR
authors.lastname: Beyette
authors.forename: C W
authors.initials: CW
authors.lastname: Wilmsen