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Author: Vincent Magnin
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Dans cette these, nous presentons des outils de modelisation destines a l'etude des composants optoelectroniques et des methodes d'optimisation permettant d'en tirer encore plus de profit. Afin de modeliser differents composants optoelectroniques sur inp, nous avons mis au point un logiciel fonde sur la methode des faisceaux propages (bpm) afin d'etudier la propagation et l'absorption de la lumiere, et un modele hydrodynamique afin de modeliser leur comportement electronique. Nous avons realise une recherche bibliographique pour regrouper les donnees materiaux necessaires. Le premier composant que nous avons etudie et optimise est un phototransistor a heterojonction inp/ingaas pour les applications hyperfrequences. Nous avons expose son fonctionnement et montre ses possibilites et limites. Sa structure optique de type guide d'onde peut etre amelioree par l'ajout d'une couche de quaternaire. On peut envisager la realisation de phototransistors a double heterojonction pour les applications de puissance. Nous avons ensuite etudie des photodiodes pin-guide a tres fort coefficient de couplage et grande tolerance d'alignement. Differentes solutions ont ete envisagees. Nous avons montre l'interet des structures lentillees, comportant plusieurs couches de confinement d'indices optiques progressifs, et etudie leurs performances optiques et electriques. Pour optimiser ces structures, nous avons mis au point un algorithme monte carlo couple a une bpm-2d, qui permet de tester des milliers de structures aleatoires. Enfin, nous avons realise un algorithme genetique couple a une bpm-2d et avons montre son interet pour l'optimisation de composants optoelectroniques avec de nombreux parametres et des objectifs multiples. Ce type d'algorithme est fonde sur la theorie de l'evolution de darwin. Nous l'avons applique a l'optimisation de commutateurs optique a reflexion interne totale et de commutateurs cascade.
Author: Vincent Magnin
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Dans cette these, nous presentons des outils de modelisation destines a l'etude des composants optoelectroniques et des methodes d'optimisation permettant d'en tirer encore plus de profit. Afin de modeliser differents composants optoelectroniques sur inp, nous avons mis au point un logiciel fonde sur la methode des faisceaux propages (bpm) afin d'etudier la propagation et l'absorption de la lumiere, et un modele hydrodynamique afin de modeliser leur comportement electronique. Nous avons realise une recherche bibliographique pour regrouper les donnees materiaux necessaires. Le premier composant que nous avons etudie et optimise est un phototransistor a heterojonction inp/ingaas pour les applications hyperfrequences. Nous avons expose son fonctionnement et montre ses possibilites et limites. Sa structure optique de type guide d'onde peut etre amelioree par l'ajout d'une couche de quaternaire. On peut envisager la realisation de phototransistors a double heterojonction pour les applications de puissance. Nous avons ensuite etudie des photodiodes pin-guide a tres fort coefficient de couplage et grande tolerance d'alignement. Differentes solutions ont ete envisagees. Nous avons montre l'interet des structures lentillees, comportant plusieurs couches de confinement d'indices optiques progressifs, et etudie leurs performances optiques et electriques. Pour optimiser ces structures, nous avons mis au point un algorithme monte carlo couple a une bpm-2d, qui permet de tester des milliers de structures aleatoires. Enfin, nous avons realise un algorithme genetique couple a une bpm-2d et avons montre son interet pour l'optimisation de composants optoelectroniques avec de nombreux parametres et des objectifs multiples. Ce type d'algorithme est fonde sur la theorie de l'evolution de darwin. Nous l'avons applique a l'optimisation de commutateurs optique a reflexion interne totale et de commutateurs cascade.
Author: Xavier Begaud
Publisher: John Wiley & Sons
ISBN: 1118586573
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Author: Alain Sibille
Publisher: Academic Press
ISBN: 0123821959
Category : Technology & Engineering
Languages : es
Pages : 385
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Book Description
Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Author: Stefano Boccaletti
Publisher: A I P Press
ISBN:
Category : Mathematics
Languages : en
Pages : 384
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Book Description
The 8th Experimental Chaos Conference again demonstrated the broad spectrum of areas where nonlinear dynamics plays an important role, such as circuits, hydrodynamics, optics, chemistry, fracture dynamics, neuroscience, and cognitive science. Additional contributions outline the trends for development and application of concepts and techniques of nonlinear dynamics.
Author: Roberto Verdone
Publisher: Springer Science & Business Media
ISBN: 144712314X
Category : Computers
Languages : en
Pages : 696
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Book Description
Reporting the findings of COST 2100, a major European intergovernmental project, this volume offers system designers a good source of guidelines based on channel characterization and measurement-based modeling, as well as worthwhile ideas for future research.
Author: Eric Brousseau
Publisher: Cambridge University Press
ISBN: 1107013429
Category : Business & Economics
Languages : en
Pages : 463
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Book Description
An interdisciplinary survey of the issues surrounding the governance of the Internet.
Author: Francine Krief
Publisher: John Wiley & Sons
ISBN: 1118580893
Category : Technology & Engineering
Languages : en
Pages : 235
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Book Description
This book focuses on green networking, which is an important topic for the scientific community composed of engineers, academics, researchers and industrialists working in the networking field. Reducing the environmental impact of the communications infrastructure has become essential with the ever increasing cost of energy and the need for reducing global CO2 emissions to protect our environment. Recent advances and future directions in green networking are presented in this book, including energy efficient networks (wired networks, wireless networks, mobile networks), adaptive networks (cognitive radio networks, green autonomic networking), green terminals, and industrial research into green networking (smart city, etc.).
Author: Michael Möser
Publisher: Springer Science & Business Media
ISBN: 3540927239
Category : Technology & Engineering
Languages : en
Pages : 540
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Book Description
Suitable for both individual and group learning, Engineering Acoustics focuses on basic concepts and methods to make our environments quieter, both in buildings and in the open air. The author’s tutorial style derives from the conviction that understanding is enhanced when the necessity behind the particular teaching approach is made clear. He also combines mathematical derivations and formulas with extensive explanations and examples to deepen comprehension. Fundamental chapters on the physics and perception of sound precede those on noise reduction (elastic isolation) methods. The last chapter deals with microphones and loudspeakers. Moeser includes major discoveries by Lothar Cremer, including the optimum impedance for mufflers and the coincidence effect behind structural acoustic transmission. The appendix gives a short introduction on the use of complex amplitudes in acoustics.
Author: Henry J. Caulfield
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Book Description
Author: Wei Wang
Publisher:
ISBN: 9789535158608
Category :
Languages : en
Pages : 242
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Book Description
Cognitive radio is a hot research area for future wireless communications in the recent years. In order to increase the spectrum utilization, cognitive radio makes it possible for unlicensed users to access the spectrum unoccupied by licensed users. Cognitive radio let the equipments more intelligent to communicate with each other in a spectrum-aware manner and provide a new approach for the co-existence of multiple wireless systems. The goal of this book is to provide highlights of the current research topics in the field of cognitive radio systems. The book consists of 17 chapters, addressing various problems in cognitive radio systems.
