Download or read book Commutation optique par bistables optiques et diodes laser written by Thomas Grudzien and published by . This book was released on 1999 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book COMMUTATION EN LONGUEUR D ONDE DE DIODES LASERS ACCORDABLES PAR MULTISTABILITE OPTIQUE written by ALEXIS.. FISCHER and published by . This book was released on 1998 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE ETUDE SE SITUE DANS LE CADRE DES FONCTIONS OPTIQUES NOUVELLES POUR LES TELECOMMUNICATIONS, ET A POUR BUT L'ETUDE DES MULTISTABLES EN LONGUEUR D'ONDE ET LEURS APPLICATIONS, NOTAMMENT LE ROUTAGE DE SIGNAUX PAR COMMUTATION EN LONGUEUR D'ONDE. LES MULTISTABLES PRESENTES ICI SONT BASES SUR DES DIODES LASERS DFB ACCORDABLES SOUMIS A UNE CONTRE-REACTION INCLUANT UN ELEMENT NON-LINEAIRE EN LONGUEUR D'ONDE. CES CONTRE-REACTIONS PEUVENT ETRE DE TROIS TYPES : ELECTRONIQUE, OPTIQUE AVEC UNE INJECTION COHERENTE, OPTIQUE AVEC UNE INJECTION INCOHERENTE. CHAQUE TYPE DE CONTRE-REACTIONS EST ANALYSE THEORIQUEMENT ET EXPERIMENTALEMENT ET LES MECANISMES QUI Y PARTICIPENT SONT ETUDIES. POUR LES DEUX PREMIERS TYPES DE CONTRE-REACTIONS DES DEMONSTRATEURS DE ROUTAGE DE SIGNAUX EN LONGUEUR D'ONDE SONT PRESENTES. LES DEMONSTRATEURS BASES SUR LES MULTISTABLES EN LONGUEUR D'ONDE A CONTRE-REACTION OPTIQUE COHERENTE ONT PERMIS DE ROUTER EN LONGUEUR D'ONDE JUSQU'A 8 SIGNAUX SEPARES DE 1.125 NM (15 GHZ) AVEC DES TEMPS DE COMMUTATION DE L'ORDRE DE LA NS. L'ETUDE PORTE AUSSI SUR LE COMPORTEMENT DYNAMIQUE DE CES SYSTEMES LORSQUE L'INJECTION EST INCOHERENTE. DU POINT DE VUE THEORIQUE ILS PEUVENT ETRE MODELISES PAR UNE EQUATION D'IKEDA, ET EXPERIMENTALEMENT, ON OBSERVE DU DOUBLAGE DE PERIODE. CECI REVELE QU'UN COMPORTEMENT CHAOTIQUE EST POSSIBLE. ON PEUT ALORS ENVISAGER DU CRYPTAGE DE SIGNAUX A PARTIR DE CES SYSTEMES TOUT OPTIQUES.
Download or read book Bistabilit optique dans les micror sonateurs et applications aux syst mes de commutation optique written by Dominique Pellat and published by . This book was released on 1995 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA BISTABILITE OPTIQUE DANS DES RESONATEURS NONLINEAIRES DE COUCHE ACTIVE (AL,GA)AS EST ETUDIEE SOUS DEUX ASPECTS: PHYSIQUE ET COMPOSANT. CES BISTABLES REQUIERENT UNE NONLINEARITE DISPERSIVE D'ORIGINE ELECTRONIQUE DANS UNE REGION SPECTRALE OU L'ABSORPTION EST FAIBLE. NOUS MONTRONS EXPERIMENTALEMENT QU'IL EST POSSIBLE DE GENERER DES VARIATIONS D'INDICE NONLINEAIRE DEUX FOIS PLUS IMPORTANTES SI LE MILIEU ACTIF EST CONSTITUE D'UNE COUCHE DE GAAS MASSIF PLUTOT QUE DE MULTIPUITS QUANTIQUES GAAS/AL#0#.#3GA#0#.#7AS. AFIN D'EVALUER ET D'AMELIORER LES PERFORMANCES DE CES DISPOSITIFS BISTABLES, NOUS AVONS MIS EXPERIMENTALEMENT EN EVIDENCE LES RELATIONS ENTRE FINESSE, SATURATION DE L'INDICE NONLINEAIRE ET LARGEURS DES BOUCLES D'HYSTERESIS. NOUS EN DEDUISONS QUE LE COMPORTEMENT BISTABLE N'EXISTE QUE DANS UN DOMAINE LIMITE DE LONGUEURS D'ONDES ET DE PUISSANCE INCIDENTE. PAR AILLEURS, LE DOMAINE SPECTRAL D'OBSERVATION DE LA BISTABILITE OPTIQUE A ETE ETENDU AVEC L'OBSERVATION DE LA BISTABILITE OPTIQUE A 0,98 M GRACE A UNE STRUCTURE DE RESONATEUR ORIGINALE OU L'EPAISSEUR TOTALE DES COUCHES CONTRAINTES EST REDUITE. AFIN D'ABAISSER LES SEUILS DE COMMUTATION, NOUS AVONS REALISE UN CONFINEMENT OPTIQUE ET ELECTRONIQUE GRACE A UNE TECHNIQUE D'INDUCTION D'ALLIAGE LOCALISEE, ET NOUS AVONS OBSERVE UNE BISTABILITE OPTIQUE D'ORIGINE MIXTE ABSORPTIVE ET DISPERSIVE DANS DES MICRORESONATEURS DE DIAMETRE ALLANT JUSQU'A 2,8 M. ENFIN, NOUS AVONS REALISE EXPERIMENTALEMENT LE MONTAGE COMPACT, A BASE DE DIODES LASER, D'UN REGISTRE OPTIQUE PERMETTANT DE STOCKER PARALLELEMENT 4 BITS SUR UN BISTABLE. NOUS AVONS VALIDE LA FONCTION CLE DE CE REGISTRE: UNE CONVERSION SERIE-PARALLELE A UN DEBIT DE 15 MHZ OPEREE GRACE A UN MODULATEUR ACOUSTO-OPTIQUE
Download or read book Dynamique des syst mes bistables optiques et des lasers Brillouin fibre written by Jaouad Zemmouri and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux présentés dans ce mémoire concernent trois parties distinctes : dans la 1ere partie, on présente une technique particulière de modulation du champ incident permettant d'obtenir, à la sortie d'un milieu complètement opaque en régime permanent, des impulsions dont la puissance crêtre est largement supérieure à celle du champ incident. La 2nde partie est consacrée à l'étude de la dynamique des systèmes bistables optiques : les différentes études menées dans ce cadre sont : le retard à la commutation ; le ralentissement non critique ; les instabilités intrinsèques ; la stabilisation de la branche instable du cycle d'hystéresis ; la réponse du bistable à une modulation extérieure, les effets dynamiques en hystéresis optique dans les sytèmes déterministes et non déterministes. Dans la dernière partie, on présente l'étude de la dynamique des lasers Brillouin à fibre optique. Nous avons montré théoriquement et expérimentalement qu'il existe une longueur critique de la fibre en deçà de laquelle le laser Brillouin est toujours stable. Ce résultat s'inscrit dans le cadre d'une analyse de stabilité du système sur des zones de paramètres très larges. Par ailleurs, l'étude de la dynamique du laser Brillouin émettant les deux premières composantes stokes est présentée.
Download or read book Diodes lasers pour les syst mes de communications optiques written by Frédéric Grillot and published by Editions Universitaires Européennes. This book was released on 2010 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alors que les télécommunications optiques se sont imposées dans les liaisons point à point de très haut débit, leur extension au réseau métropolitain, caractérisé par une grande densité de connexions, est aujourd'hui freinée par le prix élevé des composants. Un des principaux facteurs de coût dans la fabrication des modules optique est lié au besoin de coupler le laser à un isolateur afin de le protéger des réflexions externes. Le but de ce travail a consisté à développer des lasers monomodes DFB (Distributed Feed-Back) faiblement sensibles à la réalimentation optique afin de pouvoir réaliser des transmissions à très haut-débit sans isolateur. Afin de s'affranchir de l'opération de tri, de nouvelles structures DFB à pas variable et fondées sur l'utilisation d'un réseau de Bragg asymétrique ont ensuite été réalisées. Les résultats montrent des performances statiques et dynamiques homogènes sur plaque et au-delà de l'état de l'art. Outre la réduction du prix lié à l'absence d'isolateur et à la suppression de l'opération de tri, les performances obtenues sont particulièrement prometteuses pour le développement des réseaux de télécommunications tout optique.
Download or read book 6 mes Journ es d tudes sur l optique dans l ordinateur written by and published by Editions de Physique. This book was released on 1991 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanophotonics written by Hervé Rigneault and published by Wiley-ISTE. This book was released on 2006-07-18 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanophotonicsis a comprehensive introduction to the emerging area concerned with controlling and shaping optical fields at a subwavelength scale. Photonic crystals and microcavities are extensively described, including non-linear optical effects. Local-probe techniques are presented and are used to characterize plasmonic devices. The emerging fields of semiconductor nanocrystals and nanobiophotonics are also presented.
Download or read book AGARD Lecture Series written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book N Heterocyclic Carbenes written by Silvia Diez-Gonzalez and published by Royal Society of Chemistry. This book was released on 2016-11-04 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: In less than 20 years N-heterocyclic carbenes (NHCs) have become well-established ancillary ligands for the preparation of transition metal-based catalysts. This is mainly due to the fact that NHCs tend to bind strongly to metal centres, avoiding the need of excess ligand in catalytic reactions. Also, NHC‒metal complexes are often insensitive to air and moisture, and have proven remarkably resistant to oxidation. This book showcases the wide variety of applications of NHCs in different chemistry fields beyond being simple phosphine mimics. This second edition has been updated throughout, and now includes a new chapter on NHC‒main group element complexes. It covers the synthesis of NHC ligands and their corresponding metal complexes, as well as their bonding and stereoelectronic properties and applications in catalysis. This is complemented by related topics such as organocatalysis and biologically active complexes. Written for organic and inorganic chemists, this book is ideal for postgraduates, researchers and industrialists.
Download or read book Phosphorus Compounds written by Maurizio Peruzzini and published by Springer Science & Business Media. This book was released on 2011-06-10 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each chapter of Phosphorus Compounds: Advanced Tools in Catalysis and Material Sciences have been carefully selected by the editors in order to represent a state-of-the-art overview of how phosphorus chemistry can provide solutions in various fields of applications. The editors have assembled an international array of world-renowned scientists and each chapter is written by experts in the fields of synthetic chemistry, homogeneous catalysis, dendrimers, theoretical calculations, materials science, and medicinal chemistry with a special focus on the chemistry of phosphorus compounds. Phosphorus Compounds: Advanced Tools in Catalysis and Material Sciences is of interest to a general readership ranging from advanced university course students to experts in academia and industry.
Download or read book Quantum Measurement Theory and its Applications written by Kurt Jacobs and published by Cambridge University Press. This book was released on 2014-08-14 with total page 729 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental advances in the control of quantum superconducting circuits, nano-mechanical resonators and photonic crystals has meant that quantum measurement theory is now an indispensable part of the modelling and design of experimental technologies. This book, aimed at graduate students and researchers in physics, gives a thorough introduction to the basic theory of quantum measurement and many of its important modern applications. Measurement and control is explicitly treated in superconducting circuits and optical and opto-mechanical systems, and methods for deriving the Hamiltonians of superconducting circuits are introduced in detail. Further applications covered include feedback control, metrology, open systems and thermal environments, Maxwell's demon, and the quantum-to-classical transition.
Download or read book Freddy the Cowboy written by Walter R. Brooks and published by Open Road Media. This book was released on 2014-12-23 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published between 1927 and 1958, the 26 classic books about Freddy the Pig are now going on to delight a sixth generation of children. Freddy the Pig, the “Renaissance Pig” (The New York Times Book Review) of Bean Farm, is back to thrill his fans of all ages in these all-American children’s classics. In Freddy the Cowboy, Mr. Flint, the owner of a nearby dude ranch, is planning to rob the First Animal Bank and it’s up to Freddy to save the day! When Freddy ruins his plans, Flint vows revenge. Together with his faithful friends, Freddy faces off against his enemy in a series of confrontations. The rivalry leads up to a dramatic shootout in the cosmetic department of the Busy Bee and a humorous fate for the troublesome Mr. Flint. The Wild West was never like this!
Download or read book Proof Theory and Automated Deduction written by Jean Goubault-Larrecq and published by Springer Science & Business Media. This book was released on 2001-11-30 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in computer applications has led to a new attitude to applied logic in which researchers tailor a logic in the same way they define a computer language. In response to this attitude, this text for undergraduate and graduate students discusses major algorithmic methodologies, and tableaux and resolution methods. The authors focus on first-order logic, the use of proof theory, and the computer application of automated searches for proofs of mathematical propositions. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Photonic Crystals written by Jean-Michel Lourtioz and published by Springer Science & Business Media. This book was released on 2008-03-19 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the theoretical background required for modelling photonic crystals and their optical properties, while presenting the large variety of devices where photonic crystals have found application. As such, it aims at building bridges between optics, electromagnetism and solid state physics. This second edition includes the most recent developments of two-dimensional photonic crystal devices, as well as some of the last results reported on metamaterials.
Download or read book Marketing in Zambia written by Reginald Biddle and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals and Applications of Nanophotonics written by Joseph W. Haus and published by Woodhead Publishing. This book was released on 2016-01-09 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals and Applications of Nanophotonics includes a comprehensive discussion of the field of nanophotonics, including key enabling technologies that have the potential to drive economic growth and impact numerous application domains such as ICT, the environment, healthcare, military, transport, manufacturing, and energy. This book gives readers the theoretical underpinnings needed to understand the latest advances in the field. After an introduction to the area, chapters two and three cover the essential topics of electrodynamics, quantum mechanics, and computation as they relate to nanophotonics. Subsequent chapters explore materials for nanophotonics, including nanoparticles, photonic crystals, nanosilicon, nanocarbon, III-V, and II-VI semiconductors. In addition, fabrication and characterization techniques are addressed, along with the importance of plasmonics, and the applications of nanophotonics in devices such as lasers, LEDs, and photodetectors. - Covers electrodynamics, quantum mechanics and computation as these relate to nanophotonics - Reviews materials, fabrication and characterization techniques for nanophotonics - Describes applications of the technology such as lasers, LEDs and photodetectors
