Accession Number : ADA307547

Title :   Multistage Optical Interconnects for Parallel Access Optical Shared Memories.

Descriptive Note : Final technical rept. Sep 91-Mar 93,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA

Personal Author(s) : Fainman, Yeshayahu

PDF Url : ADA307547

Report Date : OCT 1995

Pagination or Media Count : 74

Abstract : We have completed a network design study that identified the Dilated Benes network routing algorithm as the most compatible with this technology and that quantified the importance of BCGH performance in attaining large (>or = 1024 node) networks. We therefore placed more emphasis on achieving high efficiency and contrast ratio BCGH. The diffraction efficiency of the original binary phase LiNbO3 element was increased from 6% to 60% by going to four phase level design, and transmission through uncoated elements was increased from 51% to >99% by antireflection coating. A contrast ratio between orthogonal polarizations of 160:1 was demonstrated with 60% diffraction efficiency. As a subsystem demonstration, we used two BCGH and a liquid crystal polarization rotator to create a 2x2 optical node that combined both routing and switching. We demonstrated switching contrast ratio of better than 50:1, and also used a high speed diode to show 20 MHz data modulation. We conclude that polarization-selective holographic optical elements with transmission and diffraction efficiencies approaching 100% require only fabrication refinements, and that such elements can become a key component of future optical systems, including a high bandwidth multistage interconnection network using polarization switching.

Descriptors :   *OPTICAL STORAGE, *OPTICAL PROCESSING, ALGORITHMS, POLARIZATION, DATA MANAGEMENT, COMPUTER AIDED DESIGN, DISTRIBUTED DATA PROCESSING, ELECTROOPTICS, FREQUENCY MODULATION, SIGNAL TO NOISE RATIO, REFRACTIVE INDEX, EFFICIENCY, VERY LARGE SCALE INTEGRATION, INPUT OUTPUT PROCESSING, CHIPS(ELECTRONICS), PARALLEL PROCESSING, OPTICAL DATA, OPTICAL IMAGES, LIQUID CRYSTALS, HOLOGRAPHY, DIFFRACTION, MICROELECTRONICS, CIRCUIT INTERCONNECTIONS, ACCESS, BIREFRINGENCE, ROUTING, SYSTEMS ANALYSIS, COMPUTER NETWORKS, DATA RATE, OPTICAL CIRCUITS, OPTICAL SWITCHING, HOLOGRAMS, PACKET SWITCHING.

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE