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Author: Georges Kotrotsios
Publisher:
ISBN:
Category :
Languages : fr
Pages : 139
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Book Description
LES PROPRIETES DE LA PROPAGATION ET LES CARACTERISTIQUES DU COUPLAGE DES DEUX PREMIERS MODES GUIDES D'UNE FIBRE OPTIQUE DE TELECOMMUNICATIONS STANDARD FONT L'OBJET DE LA PREMIERE PARTIE DE CETTE THESE. L'APPLICATION DE LA THEORIE DES MODES COUPLES DANS LE CAS D'UNE FIBRE BIMODALE, SOUMISE A DES FAIBLES PERTURBATIONS, A ABOUTI A UNE EXPRESSION ANALYTIQUE DU COEFFICIENT DE COUPLAGE INTERMODAL. LA DEPENDANCE SPECTRALE DE LA PUISSANCE COUPLEE D'UN MODE A L'AUTRE A ETE ETUDIEE. EXPERIMENTALEMENT UN ENSEMBLE DES METHODES POUR LA MESURE DES CARACTERISTIQUES DE LA PROPAGATION ET DU COUPLAGE A ETE MIS AU POINT. CONCERNANT LA PROPAGATION LES GRANDEURS SUIVANTES SONT MESUREES: LONGUEUR DE BATTEMENT ENTRE LES MODES, DIFFERENCE DE VITESSES DE GROUPE, DEGENERESCENCE DU DEUXIEME MODE, PERTES DIFFERENTIELLES PAR COURBURE ET PERTES DIFFERENTIELLES DE PROPAGATION. CONCERNANT LE COUPLAGE LA DEPENDANCE DE LA PUISSANCE COUPLEE D'UN MODE A L'AUTRE EST MESUREE COMME FONCTION DE L'AMPLITUDE DE LA PERTURBATION, DE LA PERIODE SPATIALE DE LA PERTURBATION ET DE LA LONGUEUR D'ONDE. FINALEMENT LA CAPACITE DES MODES DE MAINTENIR LEUR IDENTITE -PARAMETRE H- EST MESUREE. POUR REALISER CES MESURES NOUS AVONS DEVELOPPE UN MODULE SEPARANT SPATIALEMENT LES DEUX MODES. DANS LA DEUXIEME PARTIE DE CETTE THESE NOTRE ATTENTION A ETE ORIENTEE VERS LES APPLICATIONS DES CAPTEURS DISTRIBUES. ACCESSOIREMENT ON A ABORDE LE SUJET DE LA TRANSMISSION DE L'INFORMATION PAR FIBRE OPTIQUE BIMODALE. EN CE QUI CONCERNE LES CAPTEURS DISTRIBUES, DE NOUVELLES METHODES DE LECTURE DE LA POSITION D'UN EVENEMENT QUI COUPLE LES DEUX MODES ONT ETE PROPOSEES, SOIT DANS LA BANDE DE BASE, SOIT PAR VOIE INTERFEROMETRIQUE. LE CODAGE SPECTRAL DE LA POSITION DE LA POSITION D'UN TRANSDUCTEUR PEUT AMELIORER LA RESOLUTION SPATIALE DU CAPTEUR DISTRIBUE. AU SUJET DE L'UTILISATION DE LA FIBRE BIMODALE DANS LES RESEAUX LOCAUX DE L'INFORMATION EN OPTIQUE COHERENTE LES CAUSES DE LA DEGRADATION DU SIGNAL SONT DISCUTEES ; LES LIMITES DE LA TRANSMISSION SONT FINALEMENT ETABLIES
Author: Georges Kotrotsios
Publisher:
ISBN:
Category :
Languages : fr
Pages : 139
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Book Description
LES PROPRIETES DE LA PROPAGATION ET LES CARACTERISTIQUES DU COUPLAGE DES DEUX PREMIERS MODES GUIDES D'UNE FIBRE OPTIQUE DE TELECOMMUNICATIONS STANDARD FONT L'OBJET DE LA PREMIERE PARTIE DE CETTE THESE. L'APPLICATION DE LA THEORIE DES MODES COUPLES DANS LE CAS D'UNE FIBRE BIMODALE, SOUMISE A DES FAIBLES PERTURBATIONS, A ABOUTI A UNE EXPRESSION ANALYTIQUE DU COEFFICIENT DE COUPLAGE INTERMODAL. LA DEPENDANCE SPECTRALE DE LA PUISSANCE COUPLEE D'UN MODE A L'AUTRE A ETE ETUDIEE. EXPERIMENTALEMENT UN ENSEMBLE DES METHODES POUR LA MESURE DES CARACTERISTIQUES DE LA PROPAGATION ET DU COUPLAGE A ETE MIS AU POINT. CONCERNANT LA PROPAGATION LES GRANDEURS SUIVANTES SONT MESUREES: LONGUEUR DE BATTEMENT ENTRE LES MODES, DIFFERENCE DE VITESSES DE GROUPE, DEGENERESCENCE DU DEUXIEME MODE, PERTES DIFFERENTIELLES PAR COURBURE ET PERTES DIFFERENTIELLES DE PROPAGATION. CONCERNANT LE COUPLAGE LA DEPENDANCE DE LA PUISSANCE COUPLEE D'UN MODE A L'AUTRE EST MESUREE COMME FONCTION DE L'AMPLITUDE DE LA PERTURBATION, DE LA PERIODE SPATIALE DE LA PERTURBATION ET DE LA LONGUEUR D'ONDE. FINALEMENT LA CAPACITE DES MODES DE MAINTENIR LEUR IDENTITE -PARAMETRE H- EST MESUREE. POUR REALISER CES MESURES NOUS AVONS DEVELOPPE UN MODULE SEPARANT SPATIALEMENT LES DEUX MODES. DANS LA DEUXIEME PARTIE DE CETTE THESE NOTRE ATTENTION A ETE ORIENTEE VERS LES APPLICATIONS DES CAPTEURS DISTRIBUES. ACCESSOIREMENT ON A ABORDE LE SUJET DE LA TRANSMISSION DE L'INFORMATION PAR FIBRE OPTIQUE BIMODALE. EN CE QUI CONCERNE LES CAPTEURS DISTRIBUES, DE NOUVELLES METHODES DE LECTURE DE LA POSITION D'UN EVENEMENT QUI COUPLE LES DEUX MODES ONT ETE PROPOSEES, SOIT DANS LA BANDE DE BASE, SOIT PAR VOIE INTERFEROMETRIQUE. LE CODAGE SPECTRAL DE LA POSITION DE LA POSITION D'UN TRANSDUCTEUR PEUT AMELIORER LA RESOLUTION SPATIALE DU CAPTEUR DISTRIBUE. AU SUJET DE L'UTILISATION DE LA FIBRE BIMODALE DANS LES RESEAUX LOCAUX DE L'INFORMATION EN OPTIQUE COHERENTE LES CAUSES DE LA DEGRADATION DU SIGNAL SONT DISCUTEES ; LES LIMITES DE LA TRANSMISSION SONT FINALEMENT ETABLIES
Author: Georges Kotrotsios
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
Author: Philippe Surmely
Publisher: Elsevier Masson
ISBN: 9782225848223
Category :
Languages : fr
Pages : 223
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Book Description
Issue des sciences et technologies des nouveaux matériaux, la fibre optique fait l'objet d'un développement industriel considérable. Une normalisation à l'échelle mondiale a accéléré son introduction dans des réseaux de toutes natures et dans de multiples dispositifs optoélectroniques. Le champ d'application de la fibre optique est donc particulièrement vaste. Un exposé de ses propriétés de base et de sa technologie contribuera à clarifier un domaine en pleine évolution. Après avoir tracé l'histoire des communications optiques, cet ouvrage décrit les structures et les caractéristiques physiques de la fibre optique. Il présente ensuite les divers aspects de sa technologie : fabrication, câblage, installation, connexion, mise en oeuvre et applications. L'abondance des schémas et la clarté des descriptions - que complète un glossaire en fin d'ouvrage - permettront au lecteur d'en cerner les principes essentiels et l'étendue du champ d'application.
Author: A. Beran
Publisher: The Mineralogical Society of Great Britain and Ireland
ISBN: 9634636624
Category : Science
Languages : en
Pages : 676
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Book Description
Author: D. Tománek
Publisher: Springer Science & Business Media
ISBN: 0306470985
Category : Technology & Engineering
Languages : en
Pages : 393
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Book Description
This series of books, which is published at the rate of about one per year, addresses fundamental problems in materials science. The contents cover a broad range of topics from small clusters of atoms to engineering materials and involve chemistry, physics, materials science, and engineering, with length scales ranging from Ångstroms up to millimeters. The emphasis is on basic science rather than on applications. Each book focuses on a single area of current interest and brings together leading experts to give an up-to-date discussion of their work and the work of others. Each article contains enough references that the interested reader can access the relevant literature. Thanks are given to the Center for Fundamental Materials Research at Michigan State University for supporting this series. M. F. Thorpe, Series Editor E-mail: thorpe@pa. msu. edu East Lansing, Michigan V PREFACE It is hard to believe that not quite ten years ago, namely in 1991, nanotubes of carbon were discovered by Sumio Iijima in deposits on the electrodes of the same carbon arc apparatus that was used to produce fullerenes such as the “buckyball”. Nanotubes of carbon or other materials, consisting ofhollow cylinders that are only a few nanometers in diameter, yet up to millimeters long, are amazing structures that self-assemble under extreme conditions. Their quasi-one-dimensional character and virtual absence of atomic defects give rise to a plethora of unusual phenomena.
Author: A. Christou
Publisher: Springer Science & Business Media
ISBN: 9400924828
Category : Technology & Engineering
Languages : en
Pages : 571
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Book Description
This publication is a compilation of papers presented at the Semiconductor Device Reliabi lity Workshop sponsored by the NATO International Scientific Exchange Program. The Workshop was held in Crete, Greece from June 4 to June 9, 1989. The objective of the Workshop was to review and to further explore advances in the field of semiconductor reliability through invited paper presentations and discussions. The technical emphasis was on quality assurance and reliability of optoelectronic and high speed semiconductor devices. The primary support for the meeting was provided by the Scientific Affairs Division of NATO. We are indebted to NATO for their support and to Dr. Craig Sinclair, who admin isters this program. The chapters of this book follow the format and order of the sessions of the meeting. Thirty-six papers were presented and discussed during the five-day Workshop. In addi tion, two panel sessions were held, with audience participation, where the particularly controversial topics of bum-in and reliability modeling and prediction methods were dis cussed. A brief review of these sessions is presented in this book.
Author: C. Bréchignac
Publisher: Springer Science & Business Media
ISBN: 3540729933
Category : Science
Languages : en
Pages : 753
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Book Description
Here is a brilliant book that covers the major aspects of nanomaterials production. It integrates the many and varied chemical, material and thermo-dynamical facets of production, offering readers a new and unique approach to the subject. The mechanical, optical, and magnetic characteristics of nanomaterials are also presented in detail. Nanomaterials are a fast developing field of research and this book serves as both a reference work for researchers and a textbook for graduate students.
Author: B. Drum
Publisher: Springer
ISBN: 9789401056809
Category : Medical
Languages : en
Pages : 0
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Book Description
Since its inception, the International Research Group on Colour Vision Deficiencies (IRGCVD) has followed the policy that the Symposium Pro ceedings should be as close as possible to a complete record of the scientific content of the meeting. This policy has the advantage of providing an accurate picture of the current state of the art in research on color vision deficiencies, but it also has the disadvantage that papers typically span a wide range of quality. In this volume, however, we have instituted a system of peer review in an effort to enhance scientific quality as much as possible while continuing our past policy of publishing all submitted manuscripts. In addition to being edited for English composition and grammar, each of the papers included here has been carefully reviewed by an IRGCVD member selected for his or her expertise in the specific topic of the paper. Reviewers were instructed to include in their comments suggestions for improvement rather than recom or rejection. In our opinion, this review process mendations for publication has resulted in substantial improvement of many of the articles and has enhanced the value of the publication. We are pleased to acknowledge the efforts of our reviewers and offer them our sincere thanks for their important contributions to Colour Vision Deficiencies X. The Editors B. Drum, J. D. Moreland & A. Serra (eds. ), Colour Vision Deficiencies X, p. xiii.
Author: Cornelia Vasile
Publisher: iSmithers Rapra Publishing
ISBN: 9781859574935
Category : Science
Languages : en
Pages : 192
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Book Description
This practical guide begins with general background to the polyethylene family, with price, production and market share information. It describes the basic types of polyethylene including virgin and filled polyethylene, copolymers, block and graft polymers and composites, and reviews the types of additives used in polyethylene. It gives the low down on the properties, including, amongst others, rheological, mechanical, chemical, thermal, and electrical properties. It goes on to describe the processing issues and conditions for the wide range of techniques used for polyethylene, and also considers post-processing and assembly issues. It offers guidance on product design and development issues, including materials selection. It is an indispensable resource for everyone working with this material.
Author: Richard A. Fournier
Publisher: Springer
ISBN: 9402410988
Category : Technology & Engineering
Languages : en
Pages : 313
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Book Description
This book presents practical information about hemispherical photography from the perspectives of field data acquisition, image processing and information retrieval methods. This book is organized into three sections. The first section describes what is hemispherical photography and what are the fundamental elements of forest structure and light interactions within the forest canopy. The second section provides practical information about the equipment, procedures and tools for procuring, processing and analyzing hemispherical photographs. Armed with this information, the third section describes several applications of hemispherical photographs to forestry and natural resource assessment. The book concludes with a discussion about modelling tools and future directions of this rapidly growing field. There is currently no information source on the market that has this comprehensive range of topics combined in a single book. The book will appeal to academics, graduate students, natural resource professionals and researchers alike.
