Browsing by Subject "Optical interconnects"
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Item Open Access Comparison of local and global computation and its implications for the role of optical interconnections in future nanoelectronic systems(Elsevier, 1993) Özaktaş, Haldun M.; Goodman J. W.Various methods of simulating diffusion phenomena with parallel hardware are discussed. In particular methods are compared requiring local and global communication among the processors in terms of total computation time. Systolic convolution on a locally connected array is seen to exhibit an asymptotic advantage over Fourier methods on a globally connected array. Whereas this may translate into a numerical advantage for extremely large numbers of ultrafast devices for two-dimensional systems, this is unlikely for three-dimensional systems. Thus global Fourier methods will be advantageous for three-dimensional systems for foreseeable device speeds and system sizes. The fact that optical interconnections are potentially advantageous for implementing the longer connections of such globally connected systems suggests that they can be beneficially employed in future nanoelectronic computers. Heat removal considerations play an important role in our conclusions.Item Open Access Computer-aided analysis and simulation of complex passive integrated optical circuits of arbitrary rectilinear topology(SPIE, 1994-05) Önal, G.; Altintaş, A.; Özaktaş, Haldun M.Optical interconnections can be beneficially employed at the chip-to-chip or backplane level of high-performance computing systems. One method of providing high speed and density interconnections among a large number of integrated circuit chips is with a passive integrated optics circuit. We have developed a method of breaking down arbitrarily complex rectilinear circuits into elementary blocks whose loss and coupling properties are known. Thus, the overall loss and noise for each connection can be calculated. A high-speed algorithm based on this method has been implemented. The high speed of our analysis system makes it suitable for incorporation in an iterative design system, which determines the minimum spacings between the guides and results in acceptable crosstalk and noise levels.Item Open Access Fundamentals of optical interconnections-a review(IEEE, 1997-06) Özaktaş, Haldun M.We review some of the relatively fundamental work in the area of optically interconnected digital computing systems. We cover comparisons of optical interconnections with other interconnection media in terms of energy and interconnection density, studies determining the optimal combination of optical and electrical interconnections that should be used, work on free-space optical interconnection architectures, complexity studies, and work on physical and logical system architectures and algorithms. We exclude work on devices, components, materials, and manufacturing.Item Open Access Germanium for high performance MOSFETs and optical interconnects(2008-10) Saraswat, K. C.; Kim, D.; Krishnamohan, T.; Kuzum, D.; Okyay, Ali Kemal; Pethe, A.; Yu H.-Y.It is believed that to continue the scaling of silicon CMOS innovative device structures and new materials have to be created in order to continue the historic progress in information processing and transmission. Recently germanium has emerged as a viable candidate to augment Si for CMOS and optoelectronic applications. In this work we will first review recent results on growth of thin and thick films of Ge on Si, technology for appropriate cleaning of Ge, surface passivation using high-κ dielectrics, and metal induced crystallization of amorphous Ge and dopant activation. Next we will review application of Ge for high performance MOSFETs. Innovative Si/Ge MOS heterostructures will be described with high on current and low off currents. Finally we will describe optical detectors and modulators for on-chip and off-chip interconnect. Successful integration of Ge on Si should allow continued scaling of silicon CMOS to below 22 nm node. ©The Electrochemical Society.Item Open Access High-speed resonant-cavity-enhanced Schottky photodiodes(IEEE, 1998) Ata, Erhan P.; Bıyıklı, Necmi; Demirel, Ekrem; Özbay, Ekmel; Gökkavas, M.; Onat, B.; Ünlü, M. S.; Tuttle, G.The top-illuminated Schottky photodiodes were fabricated by a microwave-compatible monolithic microfabrication process. Fabrication started with formation of ohmic contacts to n+ layers. Mesa isolation was followed by a Ti-Au interconnect metallization. Following this, a semitransparent Au Schottky metal and a silicon nitride layer was deposited. Finally, a thick Ti-Au layer was deposited to form an air bridge connection between the interconnect and the Schottky metal. The optical properties of the photodiodes were simulated using a transfer matrix method.Item Open Access Interpretation of the space-bandwidth product as the entropy of distinct connection patterns in multifacet optical interconnection architectures(Optical Society of America, 1993) Özaktaş, Haldun M.; Brenner, K. -H.; Lohmann, A. W.We show that the entropy of the distinct connection patterns that are possible with multifacet optical interconnection architectures is approximately equal to the space-bandwidth product of the optical system.Item Open Access Optical information processing: Past, present, and future(IEEE, 2005-09) Özaktaş, Haldun M.A historical overview of optical information processing, emphasizing the influence of and interactions with signal processing will be given. Analog optical signal processing, holography, digital optical computing, optical interconnections and optoelectronic computers, and optical switching systems are discussed. Optical and electronic devices and interconnections are compared.Item Open Access Toward an optimal foundation architecture for optoelectronic computing. Part I: Regularly interconnected device planes(Optical Society of America, 1997-08-10) Özaktaş, Haldun M.By systematically examining the tree of possibilities for optoelectronic computing architectures and offering arguments that allow one to prune suboptimal branches of this tree, I come to the conclusion that electronic circuit planes interconnected optically according to regular connection patterns represent an alternative that is reasonably close to the best possible, as defined by physical limitations. Thus I propose that this foundation architecture should provide a basis for future research and development in this area.Item Open Access Towards an optimal foundation architecture for optoelectronic computing(IEEE, 1996) Özaktaş, Haldun, M.By systematically examining the tree of possibilities for electronic computing architectures and offering arguments that allow us to prune suboptimal branches of this tree, we come to the conclusion that electronic circuit planes interconnected optically according to regular connection patterns, represents an alternative which is reasonably close to the best possible as defined by physical limitations. Thus we propose that this foundation architecture should provide a basis for future research and development in this area.