We discuss the advantages of dynamic opticalinterconnections in the context of parallelprocessing. After describing algorithms where reconfiguration is useful, we describe an optical system using a nematic liquid cr...
ISBN:
(纸本)0750301260
We discuss the advantages of dynamic opticalinterconnections in the context of parallelprocessing. After describing algorithms where reconfiguration is useful, we describe an optical system using a nematic liquid crystal spatial light modulator acting in a phase-only modulation mode. Binary phase structures displayed on the device provide programmable interconnection and fan-out topologies.
This paper presents a highly parallel, three dimensionally interconnected system to process high-throughput stream data such as images. optical interconnect at wavelengths to which silicon is transparent is used to cr...
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We experimentally demonstrate 100-m-long image fiber transmission of four-channel multiplexed two-dimensional signals. To upgrade the system throughput, we study several hundred Gb/s-class 2-D opticalparallel data li...
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ISBN:
(纸本)0818685727
We experimentally demonstrate 100-m-long image fiber transmission of four-channel multiplexed two-dimensional signals. To upgrade the system throughput, we study several hundred Gb/s-class 2-D opticalparallel data link using an image fiber for the transmission and 2-D arrays of vertical-cavity surface-emitting laser diodes (VCSEL's) and p-i-n photo-diodes (PD's) as the transmitter and the receiver respectively. This system employs space code division multiple access (Space-CDMA) to multiplex 2-D opticalparallel signals. To establish multichannel optical link between 2-D VCSEL array and PD array with a high alignment precision and a good repeatability, we develop a novel visual alignment technique using a micro-optic image fiber coupler which consists of miniature cube beamsplitter and graded index (GRIN) rod lenses. The effectiveness of the visual alignment with the image fiber coupler is experimentally demonstrated. This result will encourage the application of optical space-CDMA using an image fiber and 2-D arrays of VCSEL's and PD's to future high-throughput 2-D parallel data links connecting massivelyparallel processors.
We propose a new optical connection system using thin film modulators and detectors on top of silicon VLSI chips. The advantage of this system is that the entire chip area could be dedicated to processor and memor cir...
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Functional programming languages are well suited to the expression and automatic mapping of parallel computations. The Paradigm compiler is being developed to automatically analyze and map a class of Sisal programs am...
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Functional programming languages are well suited to the expression and automatic mapping of parallel computations. The Paradigm compiler is being developed to automatically analyze and map a class of Sisal programs amenable to static analysis for execution by distributed computer systems. A program description tree is constructed to represent the source program. In this form, the program is transformed into a hierarchy of acyclic interconnections of program modules (code blocks) of two basic types: array generators and stream producers. The program description tree is then used to guide decisions about allocation of processing elements to code blocks, and to construct of code for a target multiprocessor. We discuss the problem of finding an optimal allocation (mapping), and illustrate the methodology using a practical signal processing example.
A digital orthophoto can be obtained by rectifying a digitized perspective aerial photo. The orthorectification requires a terrain elevation model to remove the displacement caused by terrain relief. This paper descri...
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ISBN:
(纸本)0819411795
A digital orthophoto can be obtained by rectifying a digitized perspective aerial photo. The orthorectification requires a terrain elevation model to remove the displacement caused by terrain relief. This paper describes a technique for partitioning a large photo into multiple subimages, mapping them onto the array processor for rectifications, and combining the results into an orthophoto. The combination of innovative algorithms and the massivelyparallel processor architecture leads to a significant improvement in throughput of digital orthophoto production.
In classical massivelyparallel computers, the complexity of the interconnection networks is much higher than the complexity of the processing elements themselves. opticalinterconnections may provide a way to reconsi...
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ISBN:
(纸本)0819418013
In classical massivelyparallel computers, the complexity of the interconnection networks is much higher than the complexity of the processing elements themselves. opticalinterconnections may provide a way to reconsider very large parallel architectures. We compare some optically interconnected parallel multicomputer models with regard to their communication capabilities. We first establish a distinction of such systems, based on the independence of the communication elements embedded in the processors (transmitters and receivers). Then, motivated by the fact that in multicomputers some communication operations have to be very efficiently performed, we study two fundamental communication problems, namely, one-to-all and all-to-all, under the hypothesis of bounded fanout. Our results take also into account a bounded number of available wavelengths.
A hybrid approach to optical computing is currently studied at the University of California, San Diego for performing parallelprocessing. Figure 1 shows a promising parallelprocessing architecture, in which an optic...
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A hybrid approach to optical computing is currently studied at the University of California, San Diego for performing parallelprocessing. Figure 1 shows a promising parallelprocessing architecture, in which an opticalprocessing array is connected massively in parallel to an optical memory array. An opticalprocessing array consists of an array of electronic logic gates; each cell in the array has at least one photodetector (or phototransistor) and one modulator for optical input/output. Similarly, an optical memory array consists of an array of electronic memory circuits; each cell in the array has also optical input/output. Within the opticalprocessing array or the optical memory array, local interconnections among neighboring cells can be established electronically. Between the opticalprocessing array and the optical memory array, global interconnections among distant cells can be established optically using the optical input/output in each cell. One important application of such a massively interconnected architecture would be to perform matrix-tensor multiplications (Ref. 1) not only for numeric computing, but also for artificial intelligence and neural computing (Ref. 2). There are three unique aspects associated with the parallel architecture of Figure 1, which may serve to justify this hybrid approach toward optical computing: optical interconnection, 3-D computational topology and optical memory.
We survey various electrooptical message routing systems for sending N messages between N processors and discuss the theory and practice of these systems. In particular, we compare these proposed systems with respect ...
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