Teaching science, technology, and society to engineering students: a sixteen year journey

Cataloged from PDF version of article.The course Science, Technology, and Society is taken by about 500 engineering students each year at Bilkent University, Ankara. Aiming to complement the highly technical engineering programs, it deals with the ethical, social, cultural, political, economic, legal, environment and sustainability, health and safety, reliability dimensions of science, technology, and engineering in a multidisciplinary fashion. The teaching philosophy and experiences of the instructor are reviewed. Community research projects have been an important feature of the course. Analysis of teaching style based on a multi-dimensional model is given. Results of outcome measurements performed for ABET assessment are provided. Challenges and solutions related to teaching a large class are discussed

Toward an optimal foundation architecture for optoelectronic computing. Part II. Physical construction and application platforms

Cataloged from PDF version of article.Various issues pertaining to the physical construction of systems that are based on regularly interconnected device planes, such as heat removal and extensibility of the optical interconnections for larger systems, are discussed. Regularly interconnected device planes constitute a foundation architecture that is reasonably close to the best possible as defined by physical limitations. Three application platforms based on the foundation architecture described are offered. © 1997 Optical Society of Americ

Repeated fractional Fourier domain filtering is equivalent to repeated time and frequency domain filtering

Cataloged from PDF version of article.Any system consisting of a sequence of multiplicative filters inserted between several fractional Fourier transform stages, is equivalent to a system composed of an appropriately chosen sequence of multiplicative filters inserted between appropriately scaled ordinary Fourier transform stages. Thus every operation that can be accomplished by repeated filtering in fractional Fourier domains can also be accomplished by repeated filtering alternately in the ordinary time and frequency domains

Toward an optimal foundation architecture for optoelectronic computing .1. Regularly interconnected device planes

Cataloged from PDF version of article.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. © 1997 Optical Society of Americ

The fractional Fourier domain decomposition

Cataloged from PDF version of article.We introduce the fractional Fourier domain decomposition. A procedure called pruning, analogous to truncation of the singular-value decomposition, underlies a number of potential applications, among which we discuss fast implementation of space-variant linear systems. (c) 1999 Published by Elsevier Science B.V. All rights reserved

Space bandwidth product of conventional Fourier Transforming Systems

Cataloged from PDF version of article.It is shown that the space-bandwidth product of conventional "2f" Fourier transforming configurations can be increased without bound by increasing the diameter D and focal length fof the lens simultaneously to Docf 3/4. This results in spacebandwidth product growth ocf ~/2 and accompanying system linear extent growth ocf ~/4. These are derived by considering the validity of the Fresnel approximation, the thin lens approximation, and the effects of aberrations

Scaling of diffractive and refractive lenses for optical computing and interconnections

Cataloged from PDF version of article.We discuss both numerically and analytically how the space-bandwidth product and the information density of lenses scale as functions of their diameter and f-number over many orders of magnitude. This information may be useful for the design of optical computing and interconnection systems. For diffractive lenses, cost is defined as the number of resolution elements the lithographic production system must have; the relationship of this quantity to the space-bandwidth product and information density is also given

Non-orthogonal Domains in Phase Space of Quantum Optics and their relation to fractional Fourier transform

Cataloged from PDF version of article.It is customary to define a phase space such that position and momentum are mutually orthogonal coordinates. Associated with these coordinates, or domains, are the position and momentum operators. Representations of the state vector in these coordinates are related by the Fourier transformation. We consider a continuum of “fractional” domains making arbitrary angles with the position and momentum domains. Representations in these domains are related by the fractional Fourier transformation. We derive transformation, commutation, and uncertainty relations between coordinate multiplication, differentiation, translation, and phase shift operators making arbitrary angles with each other. These results have a simple geometric interpretation in phase space and applications in quantum optics

Optical-coordinate transformation methods and optical-interconnection architectures

Cataloged from PDF version of article.The analogy between optical one-to-one point transformations and optical one-to-one interconnections is discussed. Methods for performing both operations are reviewed and compared. The multifacet and multistage architectures have the flexibility to implement any arbitrary one-to-one transformation or interconnection pattern. The former would be preferred for low-cost and low-resolution applications, whereas the latter would be preferred for high-cost and high-performance applications

Interpolating between periodicity and discreteness through the fractional Fourier transform

Cataloged from PDF version of article.Periodicity and discreteness are Fourier duals in the same sense as operators such as coordinate multiplication and differentiation, and translation and phase shift. The fractional Fourier transform allows interpolation between such operators which gradually evolve from one member of the dual pair to the other as the fractional order goes from zero to one. Here, we similarly discuss the interpolation between the dual properties of periodicity and discreteness, showing how one evolves into the other as the order goes from zero to one. We also discuss the concepts of partial discreteness and partial periodicity and relate them to fractional discreteness and periodicity