Analysis and mitigation of the factors limiting the efficiency of high power distributed feedback diode lasers

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Author :
Publisher : Cuvillier Verlag
ISBN 13 : 3736945213
Total Pages : 388 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Analysis and mitigation of the factors limiting the efficiency of high power distributed feedback diode lasers by : Christoph Matthias Schultz

Download or read book Analysis and mitigation of the factors limiting the efficiency of high power distributed feedback diode lasers written by Christoph Matthias Schultz and published by Cuvillier Verlag. This book was released on 2013-10-08 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-power, high-efficiency, wavelength-stabilized broad area (BA) diode lasers are promising devices for industrial applications. They can be used, for example, for pumping narrow absorption bands in gain media of solid-state and fiber lasers as well as for power scaling by means of dense spectral beam combining. This thesis focuses on the analysis and mitigation of the factors limiting the efficiency of high-power distributed feedback (DFB) diode lasers. In particular, it will be shown how a power conversion efficiency in the 60 %-range can be achieved from 10 W-class 100 μm stripe DFB-BA lasers – values close to those of state-of-the-art Fabry-Pérot (FP) BA lasers. For the first time world-wide, newly developed DFB-BA lasers achieve 12 W continuous mode optical output power with 62 % peak power conversion efficiency and 58 % at 10 W, respectively. Wavelength stabilization is demonstrated from threshold to 15 A with a spectral width below 0.8 nm containing 95 % of the emitted power. The factors limiting the efficiency of DFB-BA lasers compared to state-of-the-art 10 W-class FP-BA lasers have been identified and as a result largely eliminated.

Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers

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Author :
Publisher : Cuvillier Verlag
ISBN 13 : 3736963963
Total Pages : 136 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers by : Thorben Kaul

Download or read book Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers written by Thorben Kaul and published by Cuvillier Verlag. This book was released on 2021-04-09 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents progress in the root-cause analysis of power saturation mechanisms in continuous wave (CW) driven GaAs-based high-power broad area diode lasers operated at 935 nm. Target is to increase efficiency at high optical CW powers by epitaxial design. The novel extreme triple asymmetric (ETAS) design was developed and patented within this work to equip diode lasers that use an extremely thin p-waveguide with a high modal gain. An iterative variation of diode lasers employing ETAS designs was used to experimentally clarify the impact of modal gain on the temperature dependence of internal differential quantum efficiency (IDQE) and optical loss. High modal gain leads to increased free carrier absorption from the active region. However, less power saturation is observed, which must then be attributed to an improved temperature sensitivity of the IDQE. The effect of longitudinal spatial hole burning (LSHB) leads to above average non-linear carrier loss at the back facet of the device. At high CW currents the junction temperature rises. Therefore, not only the asymmetry of the carrier profile increases but also the average carrier density in order to compensate for the decreased material gain and increased threshold gain. This carrier non-pinning effect above threshold is found in this work to enhance the impact of LSHB already at low currents, leading to rapid degradation of IDQE with temperature. This finding puts LSHB into a new context for CW-driven devices as it emphasizes the importance of low carrier densities at threshold. The carrier density was effectively reduced by applying the novel ETAS design. This enabled diode lasers to be realized that show minimized degradation of IDQE with temperature and therefore improved performance in CW operation.

Broad-Area Laser Bars for 1 kW-Emission

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Author :
Publisher : Cuvillier Verlag
ISBN 13 : 3736966261
Total Pages : 143 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Broad-Area Laser Bars for 1 kW-Emission by : Matthias M. Karow

Download or read book Broad-Area Laser Bars for 1 kW-Emission written by Matthias M. Karow and published by Cuvillier Verlag. This book was released on 2022-06-27 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: ndustrial laser systems for material processing applications rely on the availability of highly efficient, high-brightness diode lasers. GaAs-based broad-area laser bars play a vital role in such applications as pump sources for high-beam-quality solid-state lasers and, increasingly, as direct processing tools. This work studies 940 nm-laser bars emitting 1 kW optical power at room temperature, identifying those physical mechanisms that are currently limiting electrical-to-optical conversion efficiency as well as lateral beam quality. In the process, several diagnostic studies on bars with varied lateral-longitudinal design were carried out. The effects of technological measures for performance optimization were analyzed, yielding a new benchmark in efficiency and lateral divergence. The studies into altered resonator lengths of 4 and 6 mm as well as fill factors between 69 and 87 % successfully reduce both the voltage dropping across the device and power saturation at high currents, enabling 66 % efficiency at the operation point. Concrete measures how to reach efficiencies ≥70 % are presented thereafter, showing that doubling the efficiency value of the first 1 kW-demonstration in 2007 – amounting to 35 % – is in near reach. Investigation of the beam quality bases on a herein proposed and realized concept, in which the far field is resolved for each individual bar emitter. In this way, it is possible to determine how far-field profiles vary along the bar width and how much these variations affect the overall bar far-field. Further, such effects specific to bar structures can be separated into non-thermal and thermal influences. The effect of mechanical chip deformation (bar smile) as well as neighboring-emitter interaction has been investigated for the first time in active kW-class devices, yielding a lateral divergence as low as 8.8° at the operation point.

Handbook of Optoelectronic Device Modeling and Simulation

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Author :
Publisher : CRC Press
ISBN 13 : 1498749577
Total Pages : 887 pages
Book Rating : 4.4/5 (987 download)

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Book Synopsis Handbook of Optoelectronic Device Modeling and Simulation by : Joachim Piprek

Download or read book Handbook of Optoelectronic Device Modeling and Simulation written by Joachim Piprek and published by CRC Press. This book was released on 2017-10-12 with total page 887 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive survey of fundamental concepts and methods for optoelectronic device modeling and simulation. Gives a broad overview of concepts with concise explanations illustrated by real results. Compares different levels of modeling, from simple analytical models to complex numerical models. Discusses practical methods of model validation. Includes an overview of numerical techniques.

Raman Fiber Lasers

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Publisher : Springer
ISBN 13 : 331965277X
Total Pages : 364 pages
Book Rating : 4.3/5 (196 download)

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Book Synopsis Raman Fiber Lasers by : Yan Feng

Download or read book Raman Fiber Lasers written by Yan Feng and published by Springer. This book was released on 2017-10-05 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book serves as a comprehensive, up-to-date reference about this cutting-edge laser technology and its many new and interesting developments. Various aspects and trends of Raman fiber lasers are described in detail by experts in their fields. Raman fiber lasers have progressed quickly in the past decade, and have emerged as a versatile laser technology for generating high power light sources covering a spectral range from visible to mid-infrared. The technology is already being applied in the fields of telecommunication, astronomy, cold atom physics, laser spectroscopy, environmental sensing, and laser medicine. This book covers various topics relating to Raman fiber laser research, including power scaling, cladding and diode pumping, cascade Raman shifting, single frequency operation and power amplification, mid-infrared laser generation, specialty optical fibers, and random distributed feedback Raman fiber lasers. The book will appeal to scientists, students, and technicians seeking to understand the recent developments and future trends of this promising and multifaceted technology.

Semiconductor Laser Theory

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Author :
Publisher : CRC Press
ISBN 13 : 1466561920
Total Pages : 551 pages
Book Rating : 4.4/5 (665 download)

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Book Synopsis Semiconductor Laser Theory by : Prasanta Kumar Basu

Download or read book Semiconductor Laser Theory written by Prasanta Kumar Basu and published by CRC Press. This book was released on 2015-06-17 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developed from the authors' classroom-tested material, Semiconductor Laser Theory takes a semiclassical approach to teaching the principles, structure, and applications of semiconductor lasers. Designed for graduate students in physics, electrical engineering, and materials science, the text covers many recent developments, including diode lasers u

Assessment of Inertial Confinement Fusion Targets

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Author :
Publisher : National Academies Press
ISBN 13 : 0309270626
Total Pages : 119 pages
Book Rating : 4.3/5 (92 download)

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Book Synopsis Assessment of Inertial Confinement Fusion Targets by : National Research Council

Download or read book Assessment of Inertial Confinement Fusion Targets written by National Research Council and published by National Academies Press. This book was released on 2013-07-17 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the fall of 2010, the Office of the U.S. Department of Energy's (DOE's) Secretary for Science asked for a National Research Council (NRC) committee to investigate the prospects for generating power using inertial confinement fusion (ICF) concepts, acknowledging that a key test of viability for this concept-ignition -could be demonstrated at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) in the relatively near term. The committee was asked to provide an unclassified report. However, DOE indicated that to fully assess this topic, the committee's deliberations would have to be informed by the results of some classified experiments and information, particularly in the area of ICF targets and nonproliferation. Thus, the Panel on the Assessment of Inertial Confinement Fusion Targets ("the panel") was assembled, composed of experts able to access the needed information. The panel was charged with advising the Committee on the Prospects for Inertial Confinement Fusion Energy Systems on these issues, both by internal discussion and by this unclassified report. A Panel on Fusion Target Physics ("the panel") will serve as a technical resource to the Committee on Inertial Confinement Energy Systems ("the Committee") and will prepare a report that describes the R&D challenges to providing suitable targets, on the basis of parameters established and provided to the Panel by the Committee. The Panel on Fusion Target Physics will prepare a report that will assess the current performance of fusion targets associated with various ICF concepts in order to understand: 1. The spectrum output; 2. The illumination geometry; 3. The high-gain geometry; and 4. The robustness of the target design. The panel addressed the potential impacts of the use and development of current concepts for Inertial Fusion Energy on the proliferation of nuclear weapons information and technology, as appropriate. The Panel examined technology options, but does not provide recommendations specific to any currently operating or proposed ICF facility.

Laser Radar

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Publisher : National Academies Press
ISBN 13 : 0309302196
Total Pages : 321 pages
Book Rating : 4.3/5 (93 download)

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Book Synopsis Laser Radar by : National Research Council

Download or read book Laser Radar written by National Research Council and published by National Academies Press. This book was released on 2014-03-14 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: In today's world, the range of technologies with the potential to threaten the security of U.S. military forces is extremely broad. These include developments in explosive materials, sensors, control systems, robotics, satellite systems, and computing power, to name just a few. Such technologies have not only enhanced the capabilities of U.S. military forces, but also offer enhanced offensive capabilities to potential adversaries - either directly through the development of more sophisticated weapons, or more indirectly through opportunities for interrupting the function of defensive U.S. military systems. Passive and active electro-optical (EO) sensing technologies are prime examples. Laser Radar considers the potential of active EO technologies to create surprise; i.e., systems that use a source of visible or infrared light to interrogate a target in combination with sensitive detectors and processors to analyze the returned light. The addition of an interrogating light source to the system adds rich new phenomenologies that enable new capabilities to be explored. This report evaluates the fundamental, physical limits to active EO sensor technologies with potential military utility; identifies key technologies that may help overcome the impediments within a 5-10 year timeframe; considers the pros and cons of implementing each existing or emerging technology; and evaluates the potential uses of active EO sensing technologies, including 3D mapping and multi-discriminate laser radar technologies.

Fiber Optics Engineering

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Publisher : Springer Science & Business Media
ISBN 13 : 1441903046
Total Pages : 378 pages
Book Rating : 4.4/5 (419 download)

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Book Synopsis Fiber Optics Engineering by : Mohammad Azadeh

Download or read book Fiber Optics Engineering written by Mohammad Azadeh and published by Springer Science & Business Media. This book was released on 2009-08-05 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the past few decades, information technologies have been evolving at a tremendous rate, causing profound changes to our world and our ways of life. In particular, fiber optics has been playing an increasingly crucial role within the telecommunication revolution. Not only most long-distance links are fiber based, but optical fibers are increasingly approaching the individual end users, providing wide bandwidth links to support all kinds of data-intensive applications such as video, voice, and data services. As an engineering discipline, fiber optics is both fascinating and challenging. Fiber optics is an area that incorporates elements from a wide range of techno- gies including optics, microelectronics, quantum electronics, semiconductors, and networking. As a result of rapid changes in almost all of these areas, fiber optics is a fast evolving field. Therefore, the need for up-to-date texts that address this growing field from an interdisciplinary perspective persists. This book presents an overview of fiber optics from a practical, engineering perspective. Therefore, in addition to topics such as lasers, detectors, and optical fibers, several topics related to electronic circuits that generate, detect, and process the optical signals are covered. In other words, this book attempts to present fiber optics not so much in terms of a field of “optics” but more from the perspective of an engineering field within “optoelectronics.

Critical Materials Strategy

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Publisher : DIANE Publishing
ISBN 13 : 1437944183
Total Pages : 166 pages
Book Rating : 4.4/5 (379 download)

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Book Synopsis Critical Materials Strategy by : Steven Chu

Download or read book Critical Materials Strategy written by Steven Chu and published by DIANE Publishing. This book was released on 2011-05 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the role of rare earth metals and other materials in the clean energy economy. It was prepared by the U.S. Department of Energy (DoE) based on data collected and research performed during 2010. In the report, DoE describes plans to: (1) develop its first integrated research agenda addressing critical materials, building on three technical workshops convened by the DoE during November and December 2010; (2) strengthen its capacity for information-gathering on this topic; and (3) work closely with international partners, including Japan and Europe, to reduce vulnerability to supply disruptions and address critical material needs. Charts and tables. This is a print on demand report.

Harnessing Light

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Publisher : National Academies Press
ISBN 13 : 0309059917
Total Pages : 358 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Harnessing Light by : National Research Council

Download or read book Harnessing Light written by National Research Council and published by National Academies Press. This book was released on 1998-09-25 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical science and engineering affect almost every aspect of our lives. Millions of miles of optical fiber carry voice and data signals around the world. Lasers are used in surgery of the retina, kidneys, and heart. New high-efficiency light sources promise dramatic reductions in electricity consumption. Night-vision equipment and satellite surveillance are changing how wars are fought. Industry uses optical methods in everything from the production of computer chips to the construction of tunnels. Harnessing Light surveys this multitude of applications, as well as the status of the optics industry and of research and education in optics, and identifies actions that could enhance the field's contributions to society and facilitate its continued technical development.

Conference Papers Index

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Publisher :
ISBN 13 :
Total Pages : 628 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Conference Papers Index by :

Download or read book Conference Papers Index written by and published by . This book was released on 1988 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).

Physics of Photonic Devices

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Publisher : John Wiley & Sons
ISBN 13 : 1118585658
Total Pages : 842 pages
Book Rating : 4.1/5 (185 download)

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Book Synopsis Physics of Photonic Devices by : Shun Lien Chuang

Download or read book Physics of Photonic Devices written by Shun Lien Chuang and published by John Wiley & Sons. This book was released on 2012-11-07 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most up-to-date book available on the physics of photonic devices This new edition of Physics of Photonic Devices incorporates significant advancements in the field of photonics that have occurred since publication of the first edition (Physics of Optoelectronic Devices). New topics covered include a brief history of the invention of semiconductor lasers, the Lorentz dipole method and metal plasmas, matrix optics, surface plasma waveguides, optical ring resonators, integrated electroabsorption modulator-lasers, and solar cells. It also introduces exciting new fields of research such as: surface plasmonics and micro-ring resonators; the theory of optical gain and absorption in quantum dots and quantum wires and their applications in semiconductor lasers; and novel microcavity and photonic crystal lasers, quantum-cascade lasers, and GaN blue-green lasers within the context of advanced semiconductor lasers. Physics of Photonic Devices, Second Edition presents novel information that is not yet available in book form elsewhere. Many problem sets have been updated, the answers to which are available in an all-new Solutions Manual for instructors. Comprehensive, timely, and practical, Physics of Photonic Devices is an invaluable textbook for advanced undergraduate and graduate courses in photonics and an indispensable tool for researchers working in this rapidly growing field.

Modern Cable Television Technology

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Author :
Publisher : Elsevier
ISBN 13 : 0080511937
Total Pages : 1093 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Modern Cable Television Technology by : David Large

Download or read book Modern Cable Television Technology written by David Large and published by Elsevier. This book was released on 2004-01-13 with total page 1093 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fully updated, revised, and expanded, this second edition of Modern Cable Television Technology addresses the significant changes undergone by cable since 1999--including, most notably, its continued transformation from a system for delivery of television to a scalable-bandwidth platform for a broad range of communication services. It provides in-depth coverage of high speed data transmission, home networking, IP-based voice, optical dense wavelength division multiplexing, new video compression techniques, integrated voice/video/data transport, and much more. Intended as a day-to-day reference for cable engineers, this book illuminates all the technologies involved in building and maintaining a cable system. But it's also a great study guide for candidates for SCTE certification, and its careful explanations will benefit any technician whose work involves connecting to a cable system or building products that consume cable services. - Written by four of the most highly-esteemed cable engineers in the industry with a wealth of experience in cable, consumer electronics, and telecommunications - All new material on digital technologies, new practices for delivering high speed data, home networking, IP-based voice technology, optical dense wavelength division multiplexing (DWDM), new video compression techniques, and integrated voice/video/data transport - Covers the latest on emerging digital standards for voice, data, video, and multimedia - Presents distribution systems, from drops through fiber optics, an covers everything from basic principles to network architectures

Precision Spectroscopy, Diode Lasers, and Optical Frequency Measurement Technology

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Author :
Publisher : Forgotten Books
ISBN 13 : 9781527922358
Total Pages : 302 pages
Book Rating : 4.9/5 (223 download)

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Book Synopsis Precision Spectroscopy, Diode Lasers, and Optical Frequency Measurement Technology by : Leo Hollberg

Download or read book Precision Spectroscopy, Diode Lasers, and Optical Frequency Measurement Technology written by Leo Hollberg and published by Forgotten Books. This book was released on 2017-10-28 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Precision Spectroscopy, Diode Lasers, and Optical Frequency Measurement Technology: Selected Publications of the Optical Frequency Measurement Group of the Time and Frequency Division Older publications may be purchased from the National Technical Information Service whose website is or phone: 703-487-4650. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Broadband Circuits for Optical Fiber Communication

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Author :
Publisher : John Wiley & Sons
ISBN 13 : 0471726397
Total Pages : 454 pages
Book Rating : 4.4/5 (717 download)

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Book Synopsis Broadband Circuits for Optical Fiber Communication by : Eduard Säckinger

Download or read book Broadband Circuits for Optical Fiber Communication written by Eduard Säckinger and published by John Wiley & Sons. This book was released on 2005-05-27 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: An expert guide to the new and emerging field of broadband circuits for optical fiber communication This exciting publication makes it easy for readers to enter into and deepen their knowledge of the new and emerging field of broadband circuits for optical fiber communication. The author's selection and organization of material have been developed, tested, and refined from his many industry courses and seminars. Five types of broadband circuits are discussed in detail: * Transimpedance amplifiers * Limiting amplifiers * Automatic gain control (AGC) amplifiers * Lasers drivers * Modulator drivers Essential background on optical fiber, photodetectors, lasers, modulators, and receiver theory is presented to help readers understand the system environment in which these broadband circuits operate. For each circuit type, the main specifications and their impact on system performance are explained and illustrated with numerical values. Next, the circuit concepts are discussed and illustrated with practical implementations. A broad range of circuits in MESFET, HFET, BJT, HBT, BiCMOS, and CMOS technologies is covered. Emphasis is on circuits for digital, continuous-mode transmission in the 2.5 to 40 Gb/s range, typically used in SONET, SDH, and Gigabit Ethernet applications. Burst-mode circuits for passive optical networks (PON) and analog circuits for hybrid fiber-coax (HFC) cable-TV applications also are discussed. Learning aids are provided throughout the text to help readers grasp and apply difficult concepts and techniques, including: * Chapter summaries that highlight the key points * Problem-and-answer sections to help readers apply their new knowledge * Research directions that point to exciting new technological breakthroughs on the horizon * Product examples that show the performance of actual broadband circuits * Appendices that cover eye diagrams, differential circuits, S parameters, transistors, and technologies * A bibliography that leads readers to more complete and in-depth treatment of specialized topics This is a superior learning tool for upper-level undergraduates and graduate-level students in circuit design and optical fiber communication. Unlike other texts that concentrate on analog circuits in general or mostly on optics, this text provides balanced coverage of electronic, optic, and system issues. Professionals in the fiber optic industry will find it an excellent reference, incorporating the latest technology and discoveries in the industry.

Packaging of High Power Semiconductor Lasers

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Author :
Publisher : Springer
ISBN 13 : 1461492637
Total Pages : 415 pages
Book Rating : 4.4/5 (614 download)

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Book Synopsis Packaging of High Power Semiconductor Lasers by : Xingsheng Liu

Download or read book Packaging of High Power Semiconductor Lasers written by Xingsheng Liu and published by Springer. This book was released on 2014-07-14 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces high power semiconductor laser packaging design. The challenges of the design and various packaging and testing techniques are detailed by the authors. New technologies and current applications are described in detail.