An associative memory is implemented by using a binary phase-only filter as the memory element in a two-focal-length (2-f) correlator architecture. A sharp autocorrelation peak, combined with the 2-f architecture, allows the noise to be separated adequately from the signal such that a simple plane mirror can be used in the correlation plane instead of a nonlinearity.
© 1992 Optical Society of America
Jehad Khoury, Jonathan S. Kane, Phil Hemmer, and Charles Woods, "Binary phase-only filter associative memory," Appl. Opt. 31, 1818-1822 (1992)