Accession Number : ADA266099


Title :   Holographic Multiplexing for 3D Optical Memory


Descriptive Note : Final rept. Sep 1992-Mar 1993


Corporate Author : FOSTER-MILLER INC WALTHAM MA


Personal Author(s) : Domash, L ; Ryan, V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266099.pdf


Report Date : Jun 1993


Pagination or Media Count : 26


Abstract : The increasing demand for larger memory capacity has led to the exploration of volume data storage in optical materials with theoretical capacities of 10 to the 13th power bits/cm cubed. However, an important technical barrier is the design of an input/output architecture to read and write to the optical 3D memory at very high speed. During Phase I of this effort, we have experimentally demonstrated the operation of a unique optical lock-in instrument that can play a key role in accessing optical memories at high data rates. This optical lock-in detector is capable of demultiplexing a highly complex wavefront consisting of a number of holograms that have been combined on a single light beam. Using the optical lock-in detector, it is possible to demultiplex and recover any individual hologram using optical mixing in a photorefractive medium with the appropriate modulation applied to the reference optical beam. For Phase Ii a prototype optical memory system is proposed, including highly parallel input/output techniques, a cache memory for faster access, and a unique photorefractive material for optical data storage. At least one key component of this optical memory system, an optical beamlet array generator, is a likely candidate for Phase III development by Foster- Miller and Polaroid Corporation.


Descriptors :   *OPTICAL DATA , *HOLOGRAPHY , *MULTIPLEXING , *OPTICAL STORAGE , HIGH RATE , COMPUTER ARCHITECTURE , HOLOGRAMS , INPUT OUTPUT PROCESSING , DATA RATE , THREE DIMENSIONAL , PROTOTYPES , PARALLEL PROCESSORS


Subject Categories : Electrooptical and Optoelectronic Devices
      Holography
      Radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE