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  • 1
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    Holographic optical interconnects for VLSI (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper introduces new applications and design trade-offs anticipated for free-space optical interconnections of VLSI chips. New implementation s of VLSI functions are described that use the capability of making optical inputs at any point on a chip and take advantage of greater flexibility in on-chip signal routing. These include n-port addressable memories, CPU clock phase distribution, hardware multipliers, and dynamic memory refresh, as well as enhanced testability. Fault tolerance and production yields may be improved by reprogramming the optical imaging system to circumvent defective elements. These attributes, as well as those related to performance alone, will affect the design methodology of future VLSI ICs. This paper focuses on identifying the design issues, their possible solutions, and their impact on VLSI design techniques and, finally, presents some preliminary measurements on various system components.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Optical Engineering (ISSN 0091-3286); 25; 1109-111
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  • 2
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    Monolithic millimeter-wave diode grid frequency multiplier arrays (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Monolithic diode frequency multiplier arrays, including barrier-N-N(+) (BNN) doubler, multi-quantum-barrier-varactor (MQBV) tripler, Schottky-quantum-barrier-varactor (SQBV) tripler, and resonant-tunneling-diode (RTD) tripler arrays, have been successfully fabricated with yields between 85 and 99 percent. Frequency doubling and/or tripling have been observed for all the arrays. Output powers of 2.4-2.6 W (eta = 10-18 percent) at 66 GHz with the BNN doubler and 3.8-10 W (eta = 1.7-4 percent) at 99 GHz with the SQBV tripler have been achieved.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Michigan Univ., The Third International Symposium on Space Terahertz Technology: Symposium Proceedings; p 595-599
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  • 3
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    Monolithic millimeter-wave diode array beam controllers: Theory and experiment (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In the current work, multi-function beam control arrays have been fabricated and have successfully demonstrated amplitude control of transmitted beams in the W and D bands (75-170 GHz). While these arrays are designed to provide beam control under DC bias operation, new designs for high-speed electronic and optical control are under development. These arrays will fill a need for high-speed watt-level beam switches in pulsed reflectometer systems under development for magnetic fusion plasma diagnostics. A second experimental accomplishment of the current work is the demonstration in the 100-170 GHz (D band) frequency range of a new technique for the measurement of the transmission phase as well as amplitude. Transmission data can serve as a means to extract ('de-embed') the grid parameters; phase information provides more complete data to assist in this process. Additional functions of the array beam controller yet to be tested include electronically controlled steering and focusing of a reflected beam. These have application in the areas of millimeter-wave electronic scanning radar and reflectometry, respectively.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Michigan Univ., The Third International Symposium on Space Terahertz Technology: Symposium Proceedings; p 45-57
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  • 4
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    An access alternative for mobile satellite networks (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Conceptually, this paper discusses strategies of digital satellite communication networks for a very large number of low density traffic stations. These stations can be either aeronautical, land mobile, or maritime. The techniques can be applied to international, domestic, regional, and special purpose satellite networks. The applications can be commercial, scientific, military, emergency, navigational or educational. The key strategy is the use of a non-orthogonal access method, which tolerates overlapping signals. With n being either time or frequency partitions, and with a single overlapping signal allowed, a low cost mobile satellite system can be designed with n squared (n squared + n + 1) number of terminals.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Jet Propulsion Lab., Proceedings of the Mobile Satellite Conference; p 395-404
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  • 5
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    Fiber Optic Tactical Local Network (FOTLAN) (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A 100 Mbit/s FDDI (fiber distributed data interface) network interface unit is described that supports real-time data, voice and video. Its high-speed interrupt-driven hardware architecture efficiently manages stream and packet data transfer to the FDDI network. Other enhancements include modular single-mode laser-diode fiber optic links to maximize node spacing, optic bypass switches for increased fault tolerance, and a hardware performance monitor to gather real-time network diagnostics.
    Keywords: OPTICS
    Type: NASA, Washington, Technology 2000, Volume 2; p 268-275
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  • 6
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    Performance of random multiple access transmission system (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The performance of the Random Multiple Access (RMA) technique, applied to a direct terminal-to-terminal link with a large number of potential users, is determined. The average signal-to-noise ratio (SNR) is derived. Under Gaussian assumption, the approximation of the probability of error is given. The analysis shows that the system performance is affected by the sequence length, the number of simultaneous users, and the number of cochannel symbols, but is not sensitive to the thermal noise. The performance of using very small aperture antenna for both transmitting and receiving without a hub station is given.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, California Inst. of Tech., Proceedings of the 2nd International Mobile Satellite Conference (IMSC 1990); p 363-372
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  • 7
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    A fiber optic tactical voice/data network based on FDDI (1988)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: An asynchronous high-speed fiber optic local area network is described that supports ordinary data packet traffic simultaneously with synchronous Tl voice traffic over a common FDDI token ring channel. A voice interface module was developed that parses, buffers, and resynchronizes the voice data to the packet network. The technique is general, however, and can be applied to any deterministic class of networks, including multi-tier backbones. A conventional single token access protocol was employed at the lowest layer, with fixed packet sizes for voice and variable for data. In addition, the higher layer packet data protocols are allowed to operate independently of those for the voice thereby permitting great flexibility in reconfiguring the network. Voice call setup and switching functions were performed external to the network with PABX equipment.
    Keywords: COMMUNICATIONS AND RADAR
    Format: text
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  • 8
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    FLAME PROPAGATION IN LAMINAR BOUNDARY LAYERS (1963)
    In:  CASI
    Details
    Publication Date: 2019-05-11
    Description: Flame propagation in laminar boundary layers
    Keywords: PHYSICS, SOLID-STATE
    Format: text
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  • 9
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    A high performance FDDI NIU for streaming voice, video, and data (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A 100-Mbit/s FDDI network interface unit (NIU) is described that supports real-time data, voice and video. Its high-speed interrupt-driven hardware architecture efficiently manages stream and packet data transfers to the FDDI network. Other enhancements include modular single-mode laser-dioce fiber optic links to maximize node spacing, optic bypass switches for increased fault tolerance, and a hardware performance monitor to gather real-time network diagnostics.
    Keywords: COMMUNICATIONS AND RADAR
    Type: FDDI, Campus-Wide and Metropolitan Area Networks; Sept. 19-21, 1990; San Jose, CA; United States
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  • 10
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    CMOS detector cells for holographic optical interconnects in microcircuits (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: This paper reports on the characterization of CMOS detectors for holographic optical interconnects in micro circuits. A VLSI temporal response system has been built, which has high-magnification viewing capabilities to facilitate the identification of the sample area under investigation. An isolated photodiode and load circuit has been characterized to determine responsivity, response time, and light spot positioning effects. The threshold of optical gate cells incorporating the above detectors and a transistor inverter stage to couple to other circuitry has been determined. The rise time and fall time of the optical gate cells have also been determined experimentally. The results were compared with the results of SPICE simulation, and show satisfactory agreement. The time delay of optical gate cell output was thus determined to be 70 ns at 10 microW light input. Threshold power was 0.5 microW light input.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Digital optical computing; Jan. 13, 14, 1987; Los Angeles, CA; United States
    Format: text
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