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  • 1
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    Transient behavior of an actively mode‐locked semiconductor laser diode (1982)
    American Institute of Physics
    Details
    Publication Date: 1982-07-15
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Implementation of optical interconnections for VLSI (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper reports on the progress in implementing optical interconnections for VLSI. Four areas are covered: (1) the holographic optical element (HOE), (2) the laser sources, (3) the detectors and associated circuits forming an optically addressed gate, and (4) interconnection experiments in which five gates are actuated from one source. A laser scanner system with a resolution of 12 x 20 microns has been utilized to generate the HOEs. Diffraction efficiency of the HOE and diffracted spot size have been measured. Stock lasers have been modified with a high-frequency package for interconnect experiments, and buried heterostructure fabrication techniques have been pursued. Measurements have been made on the fabricated photodetectors to determine dark current, responsivity, and response time. The optical gates and the overall chip have been driven successfully with an input light beam, as well as with the optical signal interconnected through the one to five holograms.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Transactions on Electron Devices (ISSN 0018-9383); ED-34; 706-714
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Optical protocols for advanced spacecraft networks (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Most present day fiber optic networks are in fact extensions of copper wire networks. As a result, their speed is still limited by electronics even though optics is capable of running three orders of magnitude faster. Also, the fact that photons do not interact with one another (as electrons do) provides optical communication systems with some unique properties or new functionality that is not readily taken advantage of with conventional approaches. Some of the motivation for implementing network protocols in the optical domain, a few possible approaches including optical code-division multiple-access (CDMA), and how this class of networks can extend the technology life cycle of the Space Station Freedom (SSF) with increased performance and functionality are described.
    Keywords: OPTICS
    Type: NASA, Washington, Beyond the Baseline 1991: Proceedings of the Space Station Evolution Symposium. Volume 1: Space Station Freedom, Part 2; p 583-63
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    High Speed Computing, LANs, and WAMs (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Optical fiber networks may one day offer potential capacities exceeding 10 terabits/sec. This paper describes present gigabit network techniques for distributed computing as illustrated by the CASA gigabit testbed, and then explores future all-optic network architectures that offer increased capacity, more optimized level of service for a given application, high fault tolerance, and dynamic reconfigurability.
    Keywords: Optics
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    LDEF fiber optic exposure experiment (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Ten fiber optic cable samples of different types were exposed in low Earth orbit for over 5.5 years on the Long Duration Exposure Facility (LDEF). Four of the samples were mounted externally, and the remaining six were internal, under approximately .5 gc/sq m of aluminum. The experiment was recovered in January of 1990, and laboratory evaluation of the effects of the exposure has continued since. An increase in loss, presumed to be from radiation darkening, aging effects on polymer materials used in cabling, unique contamination effects on connector terminations, and micrometeoroid impacts were observed on some of the samples. In addition, the dependence of sample loss was measured as a function of temperature before and after the flight. All cable samples were functional, and the best exhibited no measurable change in performance, indicating that conventional fiber optic cables can perform satisfactorily in spacecraft. Experimental results obtained to date will be presented and discussed.
    Keywords: OPTICS
    Type: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts; p 114
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Radiation and temperature effects on LDEF fiber optic cable samples (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: This paper will concentrate on results obtained from the Jet Propulsion Lab (JPL) Fiber Optics Long Duration Exposure Facility (LDEF) Experiment since the June 1991 Experimenters Workshop. Radiation darkening of the laboratory control samples will be compared with the LDEF flight samples. The results of laboratory temperature tests on the flight samples extending over a period of about nine years including the preflight and postflight analysis periods will be described.
    Keywords: OPTICS
    Type: NASA. Langley Research Center, Second LDEF Post-Retrieval Symposium Abstracts; p 113
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Fiber-Optic Terahertz Data-Communication Networks (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Network protocols implemented in optical domain. Fiber-optic data-communication networks utilize fully available bandwidth of single-mode optical fibers. Two key features of method: use of subpicosecond laser pulses as carrier signals and spectral phase modulation of pulses for optical implementation of code-division multiple access as multiplexing network protocol. Local-area network designed according to concept offers full crossbar functionality, security of data in transit through network, and capacity about 100 times that of typical fiber-optic local-area network in current use.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18898 , Laser Tech. Brief.; 2; 4; P. 106
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Optically intraconnected computer employing dynamically reconfigurable holographic optical element (1992)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: An optically intraconnected computer and a reconfigurable holographic optical element employed therein. The basic computer comprises a memory for holding a sequence of instructions to be executed; logic for accessing the instructions in sequence; logic for determining for each the instruction the function to be performed and the effective address thereof; a plurality of individual elements on a common support substrate optimized to perform certain logical sequences employed in executing the instructions; and, element selection logic connected to the logic determining the function to be performed for each the instruction for determining the class of each function and for causing the instruction to be executed by those the elements which perform those associated the logical sequences affecting the instruction execution in an optimum manner. In the optically intraconnected version, the element selection logic is adapted for transmitting and switching signals to the elements optically.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    High Bit Rate Experiments Over ACTS (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-08-26
    Description: This paper describes two high data rate experiments chat are being developed for the gigabit NASA Advanced Communications Technology Satellite (ACTS). The first is a telescience experiment that remotely acquires image data at the Keck telescope from the Caltech campus. The second is a distributed global climate application that is run between two supercomputer centers interconnected by ACTS. The implementation approach for each is described along with the expected results. Also. the ACTS high data rate (HDR) ground station is also described in detail.
    Keywords: Communications and Radar
    Type: ACTS-96-040 , International Journal of Satellite Communications (ISSN 0737 -2884); 14; 259-266
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Wavelength division multiplexed optical solitons (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: A technique of setting powers and shape of beams to allow optical solitons to exist on WDM beams in fibers.
    Keywords: Communications and Radar
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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