Patent ID: 7254304
Filing Date: 2007-08-07
Classification: G02F,G06E

Abstract:
1. An optical NAND-gate comprising: first, second, third, fourth, fifth, and sixth optical inputs; first, second, third, fourth, fifth, and sixth optical outputs; first and second optical paths leading from said first and second respective optical inputs to said first optical output; third and fourth optical paths leading from said third and fourth respective optical inputs to said second optical output; fifth and sixth optical paths leading from said fifth and sixth respective optical inputs to said third optical output; intensity filters located within each of said first, second, third, fourth, fifth, and sixth optical paths; a first optical filter having a sigmoid characteristic located at a position common to both said first and said second optical paths; a second optical filter having a sigmoid characteristic located at a position common to both said third and said fourth optical paths; and a third optical filter having a sigmoid characteristic located at a position common to both said fifth and said sixth optical paths; wherein said fourth, fifth, and sixth optical outputs from said respective first, second, and third optical filters having a sigmoid characteristic being in communication with a fourth optical filter having a sigmoid characteristic.