GaAs optoelectronic logic devices.

She Tsz Chung William.Thesis (M.Phil.)--Chinese University of Hong Kong, 1994.Includes bibliographical references (leaves 127-133).Chapter 1. --- IntroductionChapter 2. --- Review of Optical Logic --- p.11-28Chapter 2.1 --- All-Optical ApproachChapter 2.2 --- Optoelectronic ApproachChapter 2.3 --- Comparison of the Two ApproachesChapter 3. --- High Speed Photodetectors applied in Optoelectronic Logic Design --- p.29-40Chapter 3.1 --- Photoconductive SwitchChapter 3.2 --- Metal-Semiconductor-Metal PhotodetectorChapter 3.3 --- Design of Simple Logic GatesChapter 4. --- Device Fabrication and Characterization --- p.41-59Chapter 4.1 --- Design of Basic StructureChapter 4.2 --- FabricationChapter 4.3 --- Mounting of DeviceChapter 4.4 --- CharacterizationChapter 5. --- Experimental Technique --- p.60-74Chapter 5.1 --- Measurement ProcedureChapter 5.2 --- Optical SourcesChapter 5.3 --- Optical AlignmentChapter 5.4 --- Control of Optical Path DelayChapter 5.5 --- Measurement AutomationChapter 6. --- Demonstration of Optoelectronic Logic Devices --- p.75-110Chapter 6.1 --- OR GateChapter 6.2 --- Exclusive-OR GateChapter 6.3 --- Exclusive-NOR GateChapter 6.4 2 --- to 4 DecoderChapter 7. --- Discussion --- p.111-124Chapter 7.1 --- ImprovementsChapter 7.2 --- Extensions of this ProjectChapter 7.3 --- Prospects and Limitations of this ApproachChapter 8. --- Conclusion --- p.125-126References --- p.127-133AppendixChapter I. --- List of Instruments --- p.134-136Chapter II. --- Properties of GaAs --- p.137Chapter III. --- List of Accepted and Submitted Publications during the Period of Study --- p.13

Modelling and Design of Advanced High Speed Vertical Cavity Semiconductor Lasers

Vertical-cavity surface-emitting laser (VCSEL) constructions capable of direct modulation at bit rates in excess of 40 GBit/s have attracted considerable attention for future high speed long- and medium-haul networks. The two main approaches to realising this goal are, firstly, the improvement in the direct current modulation laser performance, with 40 GBit/s direct modulation having been demonstrated recently, and, secondly, using advanced modulation schemes. These, in turn, fall into two major categories: firstly, modulation of the photon lifetime in the cavity as an alternative to current modulation, and, secondly, current modulation enhanced by photon-photon resonance in a specialised laser structure (e.g. using an external cavity [1], or a laser array [2]). Theoretical models describing both of these solutions have been developed, but appear to have certain limitations which will be discussed later in the thesis, and no systematic analysis and comparison of modulation properties of advanced modulation scheme had been performed, to the best of my knowledge. This was the purpose of my PhD project. In order to understand the performance of the photon lifetime modulation for Compound Vertical Cavity Surface Emitting Semiconductor Lasers more accurately, a model involving careful analysis of both amplitude and frequency (phase) of laser emission, as well as the spectrally selective nature of the laser cavity, is required. We have developed such a model and used it to describe the laser operation and predict the performance beyond current experimental conditions in both large and small signal modulation regimes for the first time according to our knowledge. Finally, we studied the alternative method of ultrafast modulation of VCSELs, consisting of current modulation enhanced by photon-photon resonance. The analysis concentrates on the version of the method involving an in-plane integrated extended cavity. A new model is developed to overcome the limitations of existing models and to allow better understanding of the dynamic of the in-plane laser cavity

1996 Laboratory directed research and development annual report

This report summarizes progress from the Laboratory Directed Research and Development (LDRD) program during fiscal year 1996. In addition to a programmatic and financial overview, the report includes progress reports from 259 individual R&D projects in seventeen categories. The general areas of research include: engineered processes and materials; computational and information sciences; microelectronics and photonics; engineering sciences; pulsed power; advanced manufacturing technologies; biomedical engineering; energy and environmental science and technology; advanced information technologies; counterproliferation; advanced transportation; national security technology; electronics technologies; idea exploration and exploitation; production; and science at the interfaces - engineering with atoms

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Optical communication is very much useful in telecommunication systems, data processing and networking. It consists of a transmitter that encodes a message into an optical signal, a channel that carries the signal to its desired destination, and a receiver that reproduces the message from the received optical signal. It presents up to date results on communication systems, along with the explanations of their relevance, from leading researchers in this field. The chapters cover general concepts of optical communication, components, systems, networks, signal processing and MIMO systems. In recent years, optical components and other enhanced signal processing functions are also considered in depth for optical communications systems. The researcher has also concentrated on optical devices, networking, signal processing, and MIMO systems and other enhanced functions for optical communication. This book is targeted at research, development and design engineers from the teams in manufacturing industry, academia and telecommunication industries

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Topics in this Laser Tech Brief include: Electronic Components and Circuits. Electronic Systems, Physical Sciences, Materials, Mechanics, Fabrication Technology, and books and reports