Accession Number : ADP006725

Title :   Multi-mode Operations of a Holographic Memory using Orthogonal Phase Codes,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF ELECTRICAL AND COMPUTER ENGINEERIN G

Personal Author(s) : Taketomi, Yoshinao ; Ford, Joseph ; Sasaki, Hironori ; Ma, Jian ; Fainman, Yeshaiahu

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Holographic memories offer the advantages of high storage density, distributed storage, and fast parallel access. These characteristics can be important for parallel opto-electronic computers such as neural networks. The memory can be used to hold a training set which is repetitively displayed during learning. In addition, if partitioning is used to solve problems requiring more neurons than the actual number of processors, the memory can also be used to hold connection eight and threshold information. In this paper, we present results from a photorefractive memory using incremental recording scheduling and binary orthogonal phase codes image addressing. We show how this approach allows modification of the content and diffraction efficiency of the stored images, and how multiple images can be combined by complex amplitude addition and subtraction during reconstruction.

Descriptors :   *HOLOGRAPHY, *OPTICAL STORAGE, ACCESS, ADDRESSING, AMPLITUDE, APPROACH, COMPUTERS, DENSITY, DIFFRACTION, EFFICIENCY, IMAGES, LEARNING, MODIFICATION, SCHEDULING, STORAGE, TRAINING, PARALLEL PROCESSORS, NEURAL NETS, ELECTROOPTICS, OPTICAL IMAGES, IMAGE PROCESSING, REFRACTION, SYMPOSIA.

Subject Categories : Optics
      Holography
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE