Accession Number : ADP008629

Title :   Reconfigurable Interconnects Using Computer Generated Holograms and Spatial Light Modulators,

Corporate Author : NORTH CAROLINA UNIV AT CHARLOTTE

Personal Author(s) : Morris, James E. ; Feldman, Michael R.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : An efficient method of implementing programmable optical interconnects is needed for communication between processors in optically interconnected VLSI processor arrays, between optical logic gates in optical computers, and between chips, modules and boards in general purpose VLSI systems. Previously proposed methods of implementing programmable connections with Spatial Light Modulators (SLM's) suffer from high power dissipation and/or long reconfiguration times. The use of SLM's to directly encode a hologram would result in a low efficiency hologram with a large switching energy. This poor performance is due to the relatively low spatial frequencies of SLM's when compared to the spatial frequencies needed for high performance holograms. (A hologram implementing a single connection requires a large array of pixels with pixel dimensions on the order of a wavelength.) Another approach is to implement all possible connections with fixed media (e.g. lenses, fiber optic connectors, or holograms) and use amplitude SLM's to mask off the undesired connections. This approach suffers from high power dissipation and large area requirements. To form a crossbar switch between N transmitters and N receivers with this method, requires O(N2) power and O(N2) modulators.

Descriptors :   *OPTICAL CIRCUITS, *CIRCUIT INTERCONNECTIONS, *COMPUTER NETWORKS, HOLOGRAMS, LIGHT MODULATORS, VERY LARGE SCALE INTEGRATION, LOGIC CIRCUITS, GATES(CIRCUITS), OPTICAL PROCESSING, OPTICAL DETECTION, CROSSBAR SWITCHES.

Subject Categories : Electrooptical and Optoelectronic Devices
      Computer Systems
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE