Interconnection architectures are a cornerstone of parallel computing systems. However, interconnections can be a bottleneck in conventional computer architectures because of queuing structures that are necessary to h...
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ISBN:
(纸本)0819406910
Interconnection architectures are a cornerstone of parallel computing systems. However, interconnections can be a bottleneck in conventional computer architectures because of queuing structures that are necessary to handle the traffic through a switch at very high data rates and bandwidths. These issues must find new solutions to advance the state of the art in computing beyond the fundamental limit of silicon logic technology. Today's optoelectronic (OE) technology in particular VLSI/FLC spatial light modulators (SLMs) can provide a unique and innovative solution to these issues. This paper reports on the motivations for the system, describes the major areas of architectural requirements, discusses interconnection topologies and processor element alternatives, and documents an optical arbitration (i.e., control) scheme using `smart' SLMs and optical logic gates. The network topology is given in section 2.1 `Architectural Requirements - Networks,' but it should be noted that the emphasis is on the optical control scheme (section 2.4) and the system.
We discuss our motivation in determining the use of optics in a general purpose parallel computing system when examined from the point of view of computer architecture. We assume the use of traditional electronic node...
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ISBN:
(纸本)0819406910
We discuss our motivation in determining the use of optics in a general purpose parallel computing system when examined from the point of view of computer architecture. We assume the use of traditional electronic nodes interconnected via optical waveguides. We define distributed shared memory (DSM) and describe our optical interconnection network architecture by defining our proposed architectural environment and optical bus access control protocols. We present some analytical performance metrics and describe our ongoing simulation studies. We believe our architecture shows promise in allowing a large number of nodes to be optically interconnected in a familiar topology.
We demonstrate both common electrode and addressable arrays of single-mode semiconductor lasers suitable for opticalcomputing and optical data storage. In the common electrode geometry, eight lasers have been fabrica...
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ISBN:
(纸本)0819406910
We demonstrate both common electrode and addressable arrays of single-mode semiconductor lasers suitable for opticalcomputing and optical data storage. In the common electrode geometry, eight lasers have been fabricated on a single chip which show excellent spectral and power uniformity. Total optical power obtained from this array has been in excess of 1.2 Watts CW. We have also fabricated two and nine element monolithic, individually addressable arrays with emitter spacings between 10 and 150 micrometers. Results on crostalk and reliability of the arrays are presented.
GaAs optoelectronic integrated circuits (OEICs) require the combination of several types of devices that place widely differing demands upon the layer structure and processing technologies. We report on the developmen...
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ISBN:
(纸本)0819406910
GaAs optoelectronic integrated circuits (OEICs) require the combination of several types of devices that place widely differing demands upon the layer structure and processing technologies. We report on the development of MESFETs, bipolar transistors, detectors, and a unique class of beam-steered facetless grating surface-emitting lasers, and the integration of up to 300 devices of multiple types.
Three-dimensional optical memory devices may be designed to operate by means of two photon interaction in a solid matrix. Photochromic materials have been used in volume memory writing and reading with some success. T...
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ISBN:
(纸本)0819406910
Three-dimensional optical memory devices may be designed to operate by means of two photon interaction in a solid matrix. Photochromic materials have been used in volume memory writing and reading with some success. The information density, cycle times, and stability are some of the parameters addressed in this paper.
We explore the ability of a double phase conjugate mirror (DPCM) to compensate for thermal, vibrational, and other environmental fluctuations. This property lends itself to the establishment and maintenance of bidirec...
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ISBN:
(纸本)0819406910
We explore the ability of a double phase conjugate mirror (DPCM) to compensate for thermal, vibrational, and other environmental fluctuations. This property lends itself to the establishment and maintenance of bidirectional optical interconnections. We further introduce a bidirectional interconnection scheme that utilizes two wavelengths.
Many researchers have proposed free-space optical interconnects as an alternative to electrical and optical guided wave techniques for connecting electronic or optical processors. However, little discussion has been g...
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ISBN:
(纸本)0819406910
Many researchers have proposed free-space optical interconnects as an alternative to electrical and optical guided wave techniques for connecting electronic or optical processors. However, little discussion has been given to problems associated with system packaging. This paper provides an overview of several important issues in yjis area which must be solved prior to realizing free-space optical interconnect systems.
We discuss our cascaded correlator-based optical numeric processor and its projected performance (our goal is a numeric processor and not a general-purpose optical processor). We use symbolic substitution (for paralle...
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ISBN:
(纸本)0819406910
We discuss our cascaded correlator-based optical numeric processor and its projected performance (our goal is a numeric processor and not a general-purpose optical processor). We use symbolic substitution (for parallelism on long words and arrays of words), the modified signed-digit number representation (for speed, i.e., reduced carries), and a new encoding and substitution architecture to improve performance.
OptiComp Corporation is developing a general purpose digital optical computer which makes use of commercially available component technology. This computer has been named DOC II. In this manuscript, we briefly discuss...
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ISBN:
(纸本)0819406910
OptiComp Corporation is developing a general purpose digital optical computer which makes use of commercially available component technology. This computer has been named DOC II. In this manuscript, we briefly discuss some of the issues relating to the optical system of DOC II. We discuss the optical design of the various subsystems, the opto-mechanical design, and the simple system evaluation tests that were performed. As part of this discussion, we reveal some of the driving specifications, tolerance issues, and show actual test data for some of the optical subsystems.
A high speed 128-element linear avalanche photodiode array, suitable for use in opticalcomputing applications, has been designed and fabricated. The use of a guard ring surrounding the array results in low dark curre...
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ISBN:
(纸本)0819406910
A high speed 128-element linear avalanche photodiode array, suitable for use in opticalcomputing applications, has been designed and fabricated. The use of a guard ring surrounding the array results in low dark current and noise in the individual elements. Operation at gain 100 has shown good APD performance, with element dark currents less than 3 nA, noise less than 0.1 pA/Hz 1/2 , and rise and fall times about 1 ns. The design of the device makes it suitable for operation at frequencies up to 200 MHz. The paper includes the description of a solder bump mounting technique and multilayer substrate design which minimize capacitance between the elements, thereby maintaining low crosstalk. For further reduction of crosstalk, an alternative chip design is described in which a guard ring runs between all the elements.
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