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Optical Computing

Optical Computing. Joseph Clarkson. Advantages of Optical Computing. Massive parallelism Spectral domain representations Ultra fast Volume holographic storage. Areas of Research. Optical learning architectures Optical processing of advanced radar Acousto-optic switch

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Optical Computing

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  1. Optical Computing Joseph Clarkson

  2. Advantages of Optical Computing • Massive parallelism • Spectral domain representations • Ultra fast • Volume holographic storage

  3. Areas of Research • Optical learning architectures • Optical processing of advanced radar • Acousto-optic switch • Optical logic circuits • Dynamic organic hologram • Synthetic aperture radar processing

  4. Optical Learning Architectures • Emulation of neural networks • Circuits with photodetectors and light modulators • Synapses are dynamic holographic interconnection gratings

  5. Optical Learning Architectures - Results • Back propagation and competitive learning successfully implemented • First self-aligning holographic multi-layer neural networks • First winner-take-all VLSI/liquid crystal modulator array

  6. Optical Processing of Advanced Radar • Processing wide-bandwidth data from large phased array radars • Nearly intractable for conventional digital signal processors • Use dynamic volume holograms • Implemented an adaptive phased-array radar optical processor with photorefractive crystals

  7. Acousto-optic Switch • Mechanical switches are too slow for routing signals in optical fibers • Light is diffracted from each fiber to desired destination fiber • Low loss

  8. Optical Logic Circuits • Optical computers must have a fundamental logic gate • Based on interaction between optical solitons • Energy-efficient and ultra-fast NOR gate

  9. Light Bullet Dragging

  10. Dynamic Organic Hologram • Photorefractive crystals are expensive and limited in size • Reversible photochemical effects in dye molecules suspended in polymer hosts

  11. Synthetic Aperture Radar Processing • Microwave hologram of the illuminated area • Real-time processing of imaging • Capable of automatic target recognition

  12. Conclusions • High performance information processing systems • Fast parallel computation • Massive data storage • Energy efficient

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