We review the relatively short history of the ring-toric lenslet. We discuss ring-toric lenslet design and elements that we have fabricated. We illustrate how a focus-error signal (FES) is measured with a ring-toric l...
详细信息
ISBN:
(纸本)0819429376
We review the relatively short history of the ring-toric lenslet. We discuss ring-toric lenslet design and elements that we have fabricated. We illustrate how a focus-error signal (FES) is measured with a ring-toric lens. We have found that the FES slope, a measure of sensitivity to defocus, is higher or the ring-toric lenslets described in this paper than for other techniques, such as the astigmatic and obscuration methods. We measured an FES slope of 0.63 per micron of defocus. The theoretical FES slope is 1.4 mu m(-1). Finally, we describe a multi-level DOE fabricated in a single etch using grayscale-photomask technology.
This paper describes the probabilities of concurrent access to an optical jukebox in a hierarchical VOD system, it also explains some fundamental principles for the retrieval and storage of video data. Using a simplif...
详细信息
ISBN:
(纸本)0819430234
This paper describes the probabilities of concurrent access to an optical jukebox in a hierarchical VOD system, it also explains some fundamental principles for the retrieval and storage of video data. Using a simplified general framework, both singled and multiple video streams playback are discussed. As a result, there are three ways to support. more users to access an optical jukebox directly.
Distributed Knowledge Networks (DKN) provide some of the key enabling technologies for translating recent advances in automated data acquisition, digital storage, computers and communications into fundamental advances...
详细信息
ISBN:
(纸本)0780399145
Distributed Knowledge Networks (DKN) provide some of the key enabling technologies for translating recent advances in automated data acquisition, digital storage, computers and communications into fundamental advances in organizational decision support, data analysis, and related applications. DKN include computational tools for accessing, organizing, transforming, and analyzing the contents of heterogeneous, distributed data and knowledge sources and for distributed problem solving and decision making under tight time, resource, and performance constraints. This paper presents an overview of the DKN project in the Iowa State University Artificial Intelligence Laboratory,
Two bits of opticaldatastorage by a novel technique of electromagnetically induced transparency (EIT)-excited spin echoes and nondegenerate four-wave mixing in a spectral hole-burning solid is demonstrated. The pote...
详细信息
Two bits of opticaldatastorage by a novel technique of electromagnetically induced transparency (EIT)-excited spin echoes and nondegenerate four-wave mixing in a spectral hole-burning solid is demonstrated. The potential of high-density and fast opticaldata memory at high temperature is also presented.
Fiber continues to play an increasing role in connecting both telecommunications and computer networks. Once the fiber reaches an electronic box, however, it enters into the realm of package interconnections. The norm...
详细信息
ISBN:
(纸本)0780345266
Fiber continues to play an increasing role in connecting both telecommunications and computer networks. Once the fiber reaches an electronic box, however, it enters into the realm of package interconnections. The norm here is a backplane or motherboard with several daughtercards connected at right angles. To keep step with increasing signal and data rates, manufacturers are placing active optical devices, such as transceivers, on the daughtercard. These devices then require an optical path to the backplane. between daughtercards, or to the cabinet. But while electrical interconnection of backplanes is a relatively well-developed art, the optical counterparts of these connectors are embryonic by comparison.
Rapid advances in semiconductor technology have made it possible to build massively parallel processors. In addition, optical 3D storage and optical interconnections open a new opportunity due to inherent massive para...
详细信息
Rapid advances in semiconductor technology have made it possible to build massively parallel processors. In addition, optical 3D storage and optical interconnections open a new opportunity due to inherent massive parallelism and non-interference of light beams. The approaches used in current parallel database research cannot take advantage of massive parallelism which can be provided by the emerging technologies, due to speedup and scaleup limitations. In this paper, we present a computational paradigm for database machines which takes advantage of the opening opportunity for massive parallelism and discuss the validity and feasibility of the paradigm. The approach we take is based on associative computing and fine grained data parallelism which allow unlimited speedup and scaleup. Additionally, an asymptotically fast data-parallel join algorithm, which can efficiently deal with the joins in which multiple relations share a common join field, is presented. The algorithm is based on parallel sorting and parallel binary search, and performs a multiway join in O(Sigma s + Sigma log r) where s is the cost of sorting an intermediate relation and r is the size of an input relation. The cost s of sorting is kept minimum by the algorithm. (C) 1998 Elsevier Science B.V.
Large information systems that manage terabytes of data must provide rich functionality so that interesting new applications can be addressed. Since a wealth of data, information and knowledge are resident within thes...
详细信息
ISBN:
(纸本)0780399145
Large information systems that manage terabytes of data must provide rich functionality so that interesting new applications can be addressed. Since a wealth of data, information and knowledge are resident within these vast repositories, a variety cg knowledge discovery techniques have developed. These techniques are very computationally intensive and require the movement of large amounts of data. In the search for new approaches, optics may be able to help since photons have the very attractive properties of high speed, non-interference, and parallelism. optical systems can accommodate a large number of parallel, high-bandwidth channels and opticalstorage devices have very high storage densities. In this research we postulate an electrooptical computer architecture and examine the feasibility of executing a number of alphanumeric and image knowledge discovery algorithms on large multimedia data/knowledge bases with the purpose of increasing performance and functionality.
data communication aggregate bandwidth now doubles every 100 days. This transmitted data has origins and destinations, as well as way-stations. At terabit per second channel bandwidth, new optical memory technology ma...
详细信息
data communication aggregate bandwidth now doubles every 100 days. This transmitted data has origins and destinations, as well as way-stations. At terabit per second channel bandwidth, new optical memory technology may enhance the capability to launch, buffer, and collect multiplexed data streams in the optical domain. Candidate technologies include soliton fiber-loop and coherent transient memories.
暂无评论