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Micro, IEEE

Issue 6 • Date Dec. 1994

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Displaying Results 1 - 6 of 6
  • Developing diffractive optics for optical computing

    Publication Year: 1994 , Page(s): 10 - 19
    Cited by:  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1259 KB)  

    Diffractive optical elements easily handle tasks such as the generation of uniform arrays of beams, beam steering and focusing, and aberration correction that conventional optics alone often find difficult or impossible. Here we review the design, fabrication, and performance of DOEs for use as free-space interconnection elements in optical-computing and photonic-switching applications. Our discus... View full abstract»

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  • Developing a parallel-readout optical-disk system

    Publication Year: 1994 , Page(s): 20 - 27
    Cited by:  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (814 KB)  

    Optical-disk technology offers high storage densities with the possibility of parallel readout. Simply by illuminating a disk area containing more than one bit and appropriately encoding the bits, this technology permits retrieval of multiple data in parallel. When used in conjunction with a custom-designed parallel optoelectronic processing system, such systems meet the front-end storage and proc... View full abstract»

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  • Optical neural chips

    Publication Year: 1994 , Page(s): 29 - 41
    Cited by:  Papers (12)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1852 KB)  

    An array of photodetectors, each having a variable sensitivity, forms the most important component of our two gallium arsenide chips. We designed the optical neurochip so that variable sensitivity photodiodes are monolithically integrated on top of an LED array, serving both as fast analog multipliers and as on-chip weight storage elements with learning capability. Our artificial retina device com... View full abstract»

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  • Optical correlators for space applications: prospects and problems

    Publication Year: 1994 , Page(s): 42 - 47
    Request Permissions | Click to expandAbstract | PDF file iconPDF (709 KB)  

    Demanding ever-increasing throughput and processing power, space applications push the outer limits of conventional pattern-recognition technology. Optical correlators offer a siren's song of potential advantages over all-electronic devices. Realizing these advantages, however, will be difficult because of limitations on current spatial light modulators, key elements in an optical correlator. We p... View full abstract»

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  • Using optical space-frequency analysis for real-time pattern recognition

    Publication Year: 1994 , Page(s): 49 - 60
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2072 KB)  

    Simple, economical hardware based on incoherent space-frequency analysis overcomes many drawbacks associated with coherent optical systems. We have adopted this technique in developing a compact camera unit that uses a liquid-crystal light modulator for data input. This optically addressable camera system can automate a variety of visual inspection tasks. Adapted to conventional microscopes, it al... View full abstract»

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  • Hardware approaches to cache coherence in shared-memory multiprocessors. 2

    Publication Year: 1994 , Page(s): 61 - 66
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1015 KB)  

    Improving performance and scalability in shared-memory multiprocessors requires an appropriate solution to the well-known cache coherence problem. Hardware schemes-highly convenient because of their transparency for software-offer fully dynamic solutions, with an ability to achieve high performance. In Part 1 of this two-part series, we discussed the principles of the two major groups of hardware ... View full abstract»

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Erik R. Altman
School of Electrical and Computer Engineering
IBM T.J. Watson Research Center