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Author: Jean-Louis Auguste
Publisher:
ISBN:
Category :
Languages : fr
Pages : 185
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Book Description
LA DISPERSION CHROMATIQUE (D) QUI SE TRADUIT PAR UN ETALEMENT TEMPOREL DE L'IMPULSION LUMINEUSE SE PROPAGEANT DANS LA FIBRE OPTIQUE, EST UN FACTEUR LIMITANT DES DEBITS DE COMMUNICATION. EN EFFET, EN RAISON DU RECENT DEVELOPPEMENT DES AMPLIFICATEURS A FIBRES OPTIQUES DOPEES AUX TERRES RARES FONCTIONNANT AUTOUR DE 1.55M, LA MAJORITE DES SYSTEMES DE COMMUNICATION INSTALLES, COMPOSES DE FIBRE OPTIQUE OPTIMISEE EN TERME DE DISPERSION CHROMATIQUE A 1.3M, SONT UTILISES A 1.55M OU D EST VOISINE DE + 16 PS/NM/KM. DE NOMBREUX SYSTEMES, ACTIFS OU PASSIFS ONT ETE MIS AU POINT POUR COMPENSER CETTE DISPERSION CHROMATIQUE. LA SOLUTION QUE NOUS AVONS RETENUE POUR UNE COMPATIBILITE TOTALE AVEC LA FIBRE DE LIGNE ET SA SENSIBILITE MOINDRE AUX PARAMETRES ENVIRONNEMENTAUX (TEMPERATURE, PRESSION, VIBRATIONS) EST CELLE D'UNE FIBRE OPTIQUE A DOUBLE CUR CONCENTRIQUE PERMETTANT D'OBTENIR UNE TRES FORTE DISPERSION CHROMATIQUE NEGATIVE AUTOUR DE 1.55M. LA PREMIERE PARTIE DE CETTE THESE PRESENTE UN ETAT DE L'ART DES SOLUTIONS EXISTANTES POUR COMPENSER LA DISPERSION CHROMATIQUE AINSI QUE LE DEVELOPPEMENT D'UN OUTIL DE SIMULATION PERFORMANT, BASE SUR UNE ADAPTATION DE LA METHODE DU FAISCEAU PROPAGE (BPM) COUPLEE A L'ALGORITHME DE WIJNANDS, PERMETTANT D'OPTIMISER LES DIFFERENTS PARAMETRES OPTOGEOMETRIQUES DE LA FIBRE A DISPERSION NEGATIVE (FDN) A REALISER. LA SECONDE PARTIE DE CE RAPPORT CONDENSE LES DIFFERENTS RESULTATS EXPERIMENTAUX OBTENUS AVEC CE TYPE DE FIBRE. UNE CARACTERISATION COMPLETE EN TERME DE PROPAGATION, FORME DES CHAMPS, ATTENUATION, PERTES AU RACCORDEMENT ET DISPERSION CHROMATIQUE A ETE EFFECTUEE SUR LES DIFFERENTES FIBRES REALISEES. UNE FIBRE PRESENTANT UNE DISPERSION D 1800 PS/NM/KM A 1.558M A AINSI ETE OBTENUE. C'EST A CE JOUR ET A
Author: Jean-Louis Auguste
Publisher:
ISBN:
Category :
Languages : fr
Pages : 185
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Book Description
LA DISPERSION CHROMATIQUE (D) QUI SE TRADUIT PAR UN ETALEMENT TEMPOREL DE L'IMPULSION LUMINEUSE SE PROPAGEANT DANS LA FIBRE OPTIQUE, EST UN FACTEUR LIMITANT DES DEBITS DE COMMUNICATION. EN EFFET, EN RAISON DU RECENT DEVELOPPEMENT DES AMPLIFICATEURS A FIBRES OPTIQUES DOPEES AUX TERRES RARES FONCTIONNANT AUTOUR DE 1.55M, LA MAJORITE DES SYSTEMES DE COMMUNICATION INSTALLES, COMPOSES DE FIBRE OPTIQUE OPTIMISEE EN TERME DE DISPERSION CHROMATIQUE A 1.3M, SONT UTILISES A 1.55M OU D EST VOISINE DE + 16 PS/NM/KM. DE NOMBREUX SYSTEMES, ACTIFS OU PASSIFS ONT ETE MIS AU POINT POUR COMPENSER CETTE DISPERSION CHROMATIQUE. LA SOLUTION QUE NOUS AVONS RETENUE POUR UNE COMPATIBILITE TOTALE AVEC LA FIBRE DE LIGNE ET SA SENSIBILITE MOINDRE AUX PARAMETRES ENVIRONNEMENTAUX (TEMPERATURE, PRESSION, VIBRATIONS) EST CELLE D'UNE FIBRE OPTIQUE A DOUBLE CUR CONCENTRIQUE PERMETTANT D'OBTENIR UNE TRES FORTE DISPERSION CHROMATIQUE NEGATIVE AUTOUR DE 1.55M. LA PREMIERE PARTIE DE CETTE THESE PRESENTE UN ETAT DE L'ART DES SOLUTIONS EXISTANTES POUR COMPENSER LA DISPERSION CHROMATIQUE AINSI QUE LE DEVELOPPEMENT D'UN OUTIL DE SIMULATION PERFORMANT, BASE SUR UNE ADAPTATION DE LA METHODE DU FAISCEAU PROPAGE (BPM) COUPLEE A L'ALGORITHME DE WIJNANDS, PERMETTANT D'OPTIMISER LES DIFFERENTS PARAMETRES OPTOGEOMETRIQUES DE LA FIBRE A DISPERSION NEGATIVE (FDN) A REALISER. LA SECONDE PARTIE DE CE RAPPORT CONDENSE LES DIFFERENTS RESULTATS EXPERIMENTAUX OBTENUS AVEC CE TYPE DE FIBRE. UNE CARACTERISATION COMPLETE EN TERME DE PROPAGATION, FORME DES CHAMPS, ATTENUATION, PERTES AU RACCORDEMENT ET DISPERSION CHROMATIQUE A ETE EFFECTUEE SUR LES DIFFERENTES FIBRES REALISEES. UNE FIBRE PRESENTANT UNE DISPERSION D 1800 PS/NM/KM A 1.558M A AINSI ETE OBTENUE. C'EST A CE JOUR ET A
Author: Frédéric Gérome
Publisher:
ISBN:
Category :
Languages : fr
Pages : 275
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Book Description
Afin d'augmenter les capacités de transmission des réseaux optiques, une nouvelle technologie de multiplexage en longueur d'onde nommé WDM est née. Avec elle, le contrôle simultané de la dispersion chromatique positive des fibres de ligne pour plusieurs longueurs d'onde devient obligatoire. Une solution simple reposant sur l'insertion d'une fibre à deux cœurs concentriques est alors retenue. Le comportement modal de ces fibres incorporées dans un module est étudié en détail. Une théorie complète est élaborée puis validée expérimentalement. L'optimisation de ces profils débouche sur une réalisation MCVD dont les performances 5 fois supérieures aux valeurs actuelles ont permis le dépôt d'un brevet industriel. Finalement, la technologie microstructurée air-silice est étudiée. Une nouvelle amélioration d'un facteur 7 est obtenue. Des premières réalisations confirment ces fortes potentialités et ouvrent des perspectives tant dans le domaine de l'amplification que pour la non linéarité
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: Thomas Nugent
Publisher:
ISBN:
Category :
Languages : en
Pages : 476
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Book Description
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Karl Lowith
Publisher: Routledge
ISBN: 1134869991
Category : Social Science
Languages : en
Pages : 201
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Book Description
First Published in 2004. Lowith's study of Max Weber and Karl Marx is a key text in modem interpretations of the theme of alienation in Marxist theory and rationalisation in Weber's sociology. It remains the best short student introduction to the differences and comparisons between these essential thinkers. This new edition includes a Preface by Professor Bryan S. Turner which demonstrates the relevance of the book for contemporary sociology.
Author: Alexander V. Sergienko
Publisher: CRC Press
ISBN: 1420026607
Category : Science
Languages : en
Pages : 248
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Book Description
All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
Author: Rabindra Nath Pati
Publisher:
ISBN: 9788176259941
Category : Biodiversity conservation
Languages : en
Pages : 0
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Book Description
Papers presented at the First Global Summit on Sustainable Development and Biodiversity, held at Raipur during 7-9 February 2009.
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: Philostratus (the Athenian)
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Book Description
