A digital design methodology for optical computing
Optical computing can have significant advantages over electronic computing in terms of system speed, but only if the digital design exploits regularity. The design methods must be simple in order to manage the complexity of optics in a digital computer. This book presents a valuable new methodology for simplifying the design of digital circuits for systems that use optics as an interconnection medium. The methodology utilizes the potential of optics in computers by mapping arbitrary logic functions onto regular hardware structures, such as optical programmable logic arrays.Murdocca, provides a brief history of the field and looks at current research trends, including the creation of regular arrays of identical logic gates and the need for small, easily manufacturable optical systems. He covers alternative approaches to designing a digital optical computer and then shows in detail how to design regularity into digital optical circuits using simple methods that yield high performance without introducing significant complexity into the target machine. In the process, he points out the exciting potential offered by regular free-space interconnects, such as the possibility of completely reconfiguring the gate-to-gate interconnects of a computer on every time step.Three case studies in design - a wideband digital switch, the Rutgers CAM, and Thinking Machine's CM-1 Connection Machine - illustrate Murdocca's approach.Miles Murdocca is a Member of Technical Staff in the Optical Computing Research Department at AT&T Bell Laboratories. He is currently a Visiting Professor in the Computer Science Department at Rutgers University.
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Optical Logic Devices and Interconnects
A Few Architectural Approaches for General Purpose
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algorithm approach architecture array of optical AT&T Bell Laboratories bandwidth banyan beams binary address bitonic sorter CAM word chip circuit depth complexity Connection Machine content addressable memory copies cost crossover interconnect crossover stages decoder tree design techniques digital computing digital design digital optical computing dual-rail fan-in and fan-out fan-out stage fault four-bit free space free-space optical function gate count gate delays gate-level pipelining hardware hypercube input image input variables interconnection pattern latency layout limited Logic Unit masks matrix megahertz microoptics minterms needed operation optical design optical implementation optical interconnects optical logic devices optical logic gates OR-NOR output plane packet parallel sorting network path perfect shuffle prism array problem random access memory regular interconnects router serial adder shown in Figure signal skews sorting network sorting node speed switching components symbolic substitution two-output VLSI width x+y+s x+y+s x+y+s x+y+st x+y+st x+y+st xyst