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Thèses sur le sujet « Erbium doped optical fibres »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Bollond, Paul. "Picosecond Pulse Generation and Propagation in Erbium Doped Optical Fibres." Thesis, University of Auckland, 1997. http://hdl.handle.net/2292/1983.

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This thesis is concerned with the generation of picosecond pulses and their propagation through both resonant and non-resonant media. This was achieved by constructing a passively modelocked Erbium doped fibre laser (EDFL) which was used to study pulse propagation through sections of standard communications grade optical fibre, dispersion shifted optical fibre, and also through an Erbium doped fibre amplifier (EDFA) module. The EDFL produced a train of ˜2 psec pulses at 4 MHz, tunable over the erbium gain band ( 1520 - 1570 nm). The laser was constructed from commercially available components

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2

Males, Mladen. "Suppression of transient gain excursions in an erbium-doped fibre amplifier /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0157.

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3

Males, Mladen. "Suppression of transient gain excursions in an erbium-doped fibre amplifier." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0157.

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This thesis reports original work on suppression of transient gain excursions in an erbium-doped fibre amplifier (EDFA). The work presented in this thesis is a detailed investigation of four closed-loop systems that control the EDFA gain dynamically. The performance of the four closed-loop systems is evaluated by analytical work, supplemented by computer simulations and insystem measurements performed on a hardware EDFA. In addition, a stability analysis of the four closed-loop systems is presented. In the stability analysis presented in this thesis, nonlinear nature of the four closed-loop sy

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4

Cheney, Glenn P. (Glenn Peter) Carleton University Dissertation Engineering Electrical. "All-optical gain switching of erbium-doped fibre amplifiers." Ottawa, 1992.

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5

Hoffman, Mark Brandon. "Sub-picosecond pulse propagation in an erbium-doped fiber amplifier with ion-induced dispersion." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/14961.

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6

Da, Rosa Marcelo Zannin. "Optical gain clamping in erbium doped fibre amplifier : investigation in optical burst switching networks." Thesis, Swansea University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678524.

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7

Dimopoulos, C. "Study of dynamic phenomena in WDM optical fibre links and networks based on EDFAs." Thesis, University of Essex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327071.

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8

Altuncu, Ahmet. "Distributed erbium doped fibre amplifiers (DEDFAs) for use in long haul and high bit rate soliton transmission systems." Thesis, University of Essex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388156.

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9

Wijaya, Shierly. "Fixed-point realisation of erbium doped fibre amplifer control algorithms on FPGA." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0132.

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The realisation of signal processing algorithms in fixed-point offers substantial performance advantages over floating-point realisations. However, it is widely acknowledged that the task of realising algorithms in fixed-point is a challenging one with limited tool support. This thesis examines various aspects related to the translation of algorithms, given in infinite precision or floating-point, into fixed-point. In particular, this thesis reports on the implementation of a given algorithm, an EDFA (Erbium-Doped Fibre Amplifier) control algorithm, on a FPGA (Field Programmable Gate Array) us

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10

Goel, Nitin Kumar. "Development of "Core-Suction" Technique for Fabrication of Highly Doped Fibers for Optical Amplification and Characterization of Optical Fibers for Raman Amplification." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29302.

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This thesis presents a novel technique named "Core Suction" for fabricating optical fiber preforms for manufacturing highly doped fibers (HDFs) for optical amplification (Raman effect based or Erbium fiber based). The technique involves drawing the molten non-conventional core glass material into the silica cladding tube to form the preform. The developed technique is simple, inexpensive and shows great potential for fabricating preforms of highly nonlinear non-conventional multi-component glasses as the core material. Preforms were made with various core glasses such as Schott SF6, Lead-Tell

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11

Montes, Thisien Gabriel 1988. "Caracterização experimental de fibras de vidro telurito dopado com érbio e itérbio : Experimental characterization of tellurite glass fibers doped with erbium and ytterbium." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261920.

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Orientador: Aldário Chrestani Bordonalli<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-27T14:08:20Z (GMT). No. of bitstreams: 1 Montes_ThisienGabriel_M.pdf: 6660294 bytes, checksum: 3ca5cc8372729ad8e25455441ebddef9 (MD5) Previous issue date: 2015<br>Resumo: Com a demanda por comunicação continuamente aumentando nos últimos anos, mantém-se constante a busca por aperfeiçoamento dos amplificadores ópticos a fibra. Como uma proposta de proporcionar maior largura de banda de amplificação para

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12

Verlinden, Nicholas H. P. "The excited state absorption cross section of neodymium-doped silica glass fiber in the 1200-1500 nm wavelength range." Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-072508-145557/.

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13

Pourbahri, Babak. "Erbium-doped fibre amplifiers and their effects on the phase noise of optical carriers and radio-over-fibre signals." Thesis, University of Kent, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369689.

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14

Turghun, Matniyaz. "Free-space NPR mode locked erbrium doped fiber laser based frequency comb for optical frequency measurement." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18682.

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Master of Science<br>Department of Physics<br>Brian R. Washburn<br>This thesis reports our attempt towards achieving a phase stabilized free-space nonlinear polarization rotation (NPR) mode locked erbium doped fiber laser frequency comb system. Optical frequency combs generated by mode-locked femtosecond fiber lasers are vital tools for ultra-precision frequency metrology and molecular spectroscopy. However, the comb bandwidth and average output power become the two main limiting elements in the application of femtosecond optical frequency combs. We have specifically investigated the free-spa

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15

Šustr, Pavel. "Optický zesilovač v laboratorní výuce." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218165.

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The aim of this thesis is to introduce to reader the application and use of optical EDFA amplifiers in optical transmission and to show wiring and practical test, including measurements on amplifier. The aim of this thesis is to propose the use of optical amplifier in laboratory practice for subject Optical networks. The thesis briefly introduces the problems of data transmissions through optical fibers with a focus on the use of optical amplifiers. The basic characteristic of optical transmission paths and the reasons for the use of optical amplifiers are described here. One entire chapter is

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16

Elias, Mauro Biscaro. "Sistemas de sensores ópticos baseados em fibra óptica de perfil-W dopada com Érbio." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264962.

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Orientadores: Carlos Kenichi Suzuki, João Batista Rosolem<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-21T04:05:23Z (GMT). No. of bitstreams: 1 Elias_MauroBiscaro_D.pdf: 8521258 bytes, checksum: 71367ffa68b5edac21fdf81e63c3a7b1 (MD5) Previous issue date: 2012<br>Resumo: Fibras ópticas de casca rebaixada (também conhecidas como fibras ópticas de dupla-casca ou fibras ópticas de perfil-"W") com cortes do modo fundamental proporcionam perdas distribuídas altas em comprimentos de onda longos e perdas baixas em co

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17

Michel, David Daniel. "Linear-cavity tunable fibre lasers employing an Opto-VLSI processor and a MEMS-based device." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/520.

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This thesis proposes and demonstrates experimentally two novel linear-cavity tunable fibre lasers employing an erbium-doped fibre (EDF) in conjunction with an Opto- VLSI processor and a MEMS-based device for wavelength selection. The Opto-VLSI processor and the MEMS-based device along with an optical collimator, a Bragg grating plate and an optical lens, enable the realisation of an optical filter for continuous tuning of wavelengths over the amplified spontaneous emission (ASE) range of the EDF. We also propose the use of a section of un-pumped EDF as a saturable absorber (SA), which suppress

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18

Herbster, Adolfo Fernandes. "Projeto de amplificadores a fibra dopada com érbio para sistemas baseados em multiplexação modal." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-06082015-144812/.

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Os sistemas ópticos atuais, baseados em fibras monomodo, operam próximos ao limite teórico da capacidade. Sistemas ópticos baseados em multiplexação modal (Mode Division Multiplexing – MDM) possibilitam o aumento da capacidade do sistema por meio do uso de fibras de poucos modos. Nestes sistemas, a propriedade de ortogonalidade entre os modos propagantes permite que cada modo espacial carregue um sinal óptico específico. O amplificador à fibra dopada com érbio (Erbium-Doped Fiber Amplifier – EDFA) segue fundamental para assegurar a transmissão em longas distâncias. No entanto, devi

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19

Freire, Hermelo Maria. "Amplifier control using machine learning and coloured optical packet switching node design in optical networks." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAS024.

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Le débit de données et la consommation d’énergie sont les principaux défis auxquels doivent faire face les réseaux optiques. Afin de réduire la consommation d’énergie, les réseaux opérateurs de transport optiques basés sur le concept de commutation de circuits optiques (OCS), deviennent optiquement transparents, réduisant les conversions optique/électrique (O/E) et électrique/optique (E/O). Pour faire face à l’augmentation du débit de données, on utilise des formats de modulations complexes et la technique de multiplexage en polarisation et on économise le spectre des fibres optiques en consid

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20

Osorio, Sergio Paulo Amaral. "Fabricação e caracterização de fibras microestruturadas de vidros teluritos dopados com érbio." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278259.

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Orientador: Luiz Carlos Barbosa<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-08T19:58:45Z (GMT). No. of bitstreams: 1 Osorio_SergioPauloAmaral_D.pdf: 8946065 bytes, checksum: 9771cf8636d67bee8eb1b92d030d0d13 (MD5) Previous issue date: 2007<br>Resumo: Neste trabalho três tipos de vidro telurito são estudados, fabricados e caracterizados, tendo em vista a fabricação de fibras ópticas de cristal fotônico. Basicamente, dois processos de fabricação de fibras de cristal fotônico foram considerados: 1) Empilhamento

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21

Palma, Giuseppe. "Design of microlaser in medium infrarer wavelengnth range for biomedicine and environmental monitoring." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S017/document.

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Les micro-résonateurs optiques comptent parmi les dispositifs les plus importants en photonique. Les résonateurs WGM sont assez particuliers. Il s'agit de composant présentant une symétrie circulaire comme c'est le cas des sphères, des anneaux, des disques et des tores. Les résonateurs WGM présentent un facteur de qualité exceptionnel et un volume modal très faible. Ces appareils peuvent être utilisés dans plusieurs domaines, notamment la télédétection, le filtrage optique et l'optique non linéaire. D'autres applications sont possibles en biologie, médecine, spectroscopie moléculaire, surveill

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22

Ferreira, João Carlos de Melo. "Fiber amplifiers in transparent and dynamic optical networks." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14090.

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Doutoramento em Engenharia Eletrotécnica<br>In this thesis a study of optical fiber amplifiers in the context of transparent and dynamic optical networks is performed. We propose and validate a simplified model to estimate the gain profile and amplified spontaneous emission (ASE) noise of broadband counterpumped Raman fiber amplifiers (RFAs). The proposed model requires very low computational resources and it is suitable to be used in network planning tools. Based on the proposed model, we also present an algorithm to design flat gain counter-pumped RFAs for the extended C-band with lo

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23

Goutaland, François. "Processus multiphotoniques, défauts ponctuels et mécanismes de leur formation dans les fibres optiques : étude par spectroscopie laser." Saint-Etienne, 1998. http://www.theses.fr/1998STET4021.

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Ce mémoire se compose de deux parties, la première consacrée à l'étude des processus multiphotoniques se produisant dans des fibres optiques fortement dopées avec des ions er3+ et yb3+, et la seconde à l'étude des défauts induits par différents traitements dans des fibres germanosilicates. En étudiant la spectroscopie d'émission des fibres fortement dopées, sous excitations visibles (488 nm) et infrarouge (790 - 880 nm), nous mettons en évidence les différents mécanismes aux émissions bleues, vertes et rouge observées. Deux principaux types de processus d'up - conversion peuvent alors être dis

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24

KARAMSHUK, SVITLANA. "Organic sensitizers for application in photonic and photovoltaic devices." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/76622.

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With the increasing demand for reliable and efficient devices with minimal environmental impact, novel organic materials gain extreme interest in the research community and industry. In this work we present synthetic strategies towards new organic compounds as promising materials for dye sensitized solar cells (DSCs) and low-cost integrated optics along with the investigation of these materials in devices. Despite the recent hype in the research community around DSCs, increasing efficiency of DSCs is still a challenge. In principle, one promising way to obtain DSCs with significantly enhanced

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25

O, Cochlain Ciaran R. "Tunable erbium doped fibre lasers for lightwave communication systems." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283935.

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26

Perry, Ian Richard. "Investigations into ytterbium, ytterbium-erbium and thulium-doped silica-based fibre lasers." Thesis, University of Southampton, 1991. https://eprints.soton.ac.uk/427927/.

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27

Williams, Quinton Lemonte. "Fast temporal dynamics of the erbium-doped fiber ring laser." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/27975.

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28

VanWiggeren, Gregory D. "Chaotic communication with erbium-doped fiber ring lasers." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/30299.

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29

Fadel, Hicham Joseph. "Tunable erbium-doped fiber ring laser using an intra-cavity filter." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1050.

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Linear tuning the frequency of an erbium-doped fiber ring laser using both a Fabry-Perot filter and an electro-optic tunable filter has been experimentally demonstrated. The rate of frequency change is determined by monitoring the fringes produced by laser light transmitted through a fiber Fabry-Perot interferometer. The fiber ring laser has been tuned over a 50 nm spectral range when using the Fabry-Perot filter and a tuning rate of 16480 nm/s has been achieved. The spectral width of the laser is 0.049 nm and the nearest sidelobe to the main peak is more than 30 dB below the central lobe. Whe

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30

GARTER, MICHAEL JAMES. "ELECTROLUMINESCENT DEVICES FABRICATED ON ERBIUM DOPED GaN." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990545888.

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31

Issa, Fatma Mabruk. "Doped optical fibres thermoluminescence dosimetry for brachytherapy." Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580336.

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In the various brachytherapy techniques the intent is to deliver as high a tumour dose as possible, limited only by surrounding normal tissue tolerance. The main feature of the techniques is very steep dose gradients, representing a potential limiting factor in accurate dose distribution measurements around sources. Dose distributions at distances less than 1 cm are therefore normally generated using either validated Monte Carlo (MC) simulations or standard dose calculation formalisms, for example that of AAPM TG 43, while dose measurements can only be performed at larger distances, normally g

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32

Ono, Shunsuke. "Optical properties and gain characteristics of erbium-doped fiber amplifier." Kyoto University, 2005. http://hdl.handle.net/2433/144986.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第11688号<br>人博第294号<br>新制||人||73(附属図書館)<br>16||185(吉田南総合図書館)<br>23331<br>UT51-2005-D437<br>京都大学大学院人間･環境学研究科環境相関研究専攻<br>(主査)教授村中重利, 教授林哲介, 助教授田部勢津久<br>学位規則第4条第1項該当

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33

Furusawa, Kentaro. "Development of rare-earth doped microstructured optical fibres." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15481/.

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This thesis describes the development of novel optical fibres, microstructured optical fibres (MOFs), and demonstrates device applications based on these structures. A particular emphasis is made on incorporating rare-earth ions within these fibres in order to realise novel active devices. Together with the development of the fabrication technique, characterisation and applications of these radically different fibre types are presented. First, the fabrication techniques of MOFs, which heavily rely upon fibre drawing, are studied. A mathematical model developed for the capillary drawing process

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34

Moulding, Keith M. "Transmission electron microscopy of nonlinear optical glasses and optical fibres." Thesis, University of Essex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279411.

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35

BANERJEE, SIDDHARTHA. "OPTICAL PROPERTIES AND POPULATION STATISTICS OF ERBIUM IN OPTICALLY-PUMPED ERBIUM-DOPED ZINC SILICATE GERMANATE WAVEGUIDE AMPLIFIERS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100892919.

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36

Norhashim, Nurhakimah. "Temperature dependent photoluminescence of erbium doped YAG, zinc nitride and manganese-doped cadmium selenide optical materials." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/814013/.

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Temperature dependent studies of a selection of materials including erbium-doped yttrium aluminum garnet (Er:YAG), zinc nitride nanocrystals(NCs) and manganese-doped cadmium selenide (CdMnSe) NCS have been undertaken in order to determine their fundamental optical properties. The study is based upon the measurement of their photoluminescence (PL) and PL transient decay transient over the temperature range of 300K to 5K. For the Er:YAG samples, two different sample types are studied as a function of erbium concentration that are a fast-cooled (mono-phase) and a slow-cooled (bi-phasic) polycryst

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Olsen, David W. "Investigation of material and optical properties of erbium-doped sputtered glass films." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28972.pdf.

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Lee, Boon Kwee. "OPTICAL STORAGE IN ERBIUM DOPED GALLIUM NITRIDE USING FOCUSED ION BEAM NANOFABRICATION." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin985883067.

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39

Banerjee, Siddhartha. "Optical properties and population statistics of erbium in optically pumped erbium doped zinc silicate germanate (ZSG) waveguide amplifiers." Cincinnati, Ohio : University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1100892919.

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40

Rosa, Henrique Guimarães. "Estudo das propriedades ópticas do grafeno e sua aplicação como absorvedor saturável em lasers à fibra dopada com érbio." Universidade Presbiteriana Mackenzie, 2015. http://tede.mackenzie.br/jspui/handle/tede/1526.

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Made available in DSpace on 2016-03-15T19:38:52Z (GMT). No. of bitstreams: 1 Henrique Guimaraes Rosa.pdf: 6486656 bytes, checksum: 6fc9fe7875ed2cceb89c9f5179b9f028 (MD5) Previous issue date: 2015-02-25<br>Fundo Mackenzie de Pesquisa<br>In this thesis, we present results on the fabrication, transfer and characterization of chemical vapor deposition (CVD) graphene and exfoliated graphene over glass and optical fiber substrates, to study optical properties of graphene and its application as a saturable absorber for Erbium-doped fiber laser (EDFL). Monolayer CVD graphene and stacked CVD graphene

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41

Starr, Elizabeth Mary. "Gemania doped silica : a new material for integrated optics." Thesis, University College London (University of London), 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339043.

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42

Townsend, Janet E. "The development of optical fibres doped with rare-earth ions." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/400704/.

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Research into rare-earth ion doping of silica based optical fibres is described and a detailed study of the fabrication process reported. Dilute solutions of rare-earth ions are employed to incorporate dopants into preforms prepared by conventional methods. Alternative core glass compositions are also studied. Parameters affecting dopant incorporation, host composition and refractive index, as well as impurity concentration are investigated. Spectroscopic fluorescence and absorption measurements are presented and provide important information for device applications. In addition, fluorescence

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43

THOMAS, DJEISSON HOFFMANN. "PERFORMANCE OPTIMIZATION OF THE ERBIUM-DOPED FIBER AMPLIFIERS FOR OPERATION IN OPTICAL WDM NETWORKS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=11068@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Nas redes ópticas que contém EDFAs (amplificadores à fibra dopada com Érbio), a característica variável do tráfego faz com que a potência de entrada do amplificador oscile, causando rápidas flutuações de ganho que podem inviabilizar a transmissão de dados nos canais WDM (multiplexados por divisão de comprimento de onda) co-propagantes. As variações de tráfego podem ser lentas, quando originadas pela adição ou remoção de canais WDM em qualquer nó da rede (roteamento dos canais WDM), ou rápidas, quando causadas pela transmis

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44

Mookherjea, Shayan 1977. "Optical distribution networks : signal-to-noise ratio optimization and distributed erbium-doped fiber amplifiers." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9087.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (leaves [149]-151) and index.<br>Two important issues related to the use of remotely-pumped erbium-doped fiber amplifiers in optical distribution networks are analyzed. We investigate the optimal allocation of gain and loss among the stages of a lumped amplifier chain, using the concepts of a Nash solution and Pareto optimality. The propagation of optical channels along an erbium-doped fiber is derived from basic physical considerations, and c

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Thomas, Jérémie. "Impact de la nanostructuration des fibres dopées Erbium sur leurs performances : application aux contraintes du spatial." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20178/document.

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Ce travail de thèse porte sur l'étude de l'impact de la nanostructuration de la matière sur le comportement des fibres dopées Erbium en environnement radiatif tel que l'Espace. Cette étude est motivée par le fait qu'il n'existe pas de fibre dopée Erbium qualifiée pour le spatial, rendant l'AOFD indisponible pour ces applications, réduisant fortement l'intérêt de l'ensemble de la technologie WDM pour les satellites. Ainsi nous avons testé plusieurs fibres basées sur des technologies différentes dans le but d'évaluer leurs comportements sous radiations gamma. Nous avons ainsi défini un critère o

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Mohd, Noor Noramaliza. "The use of Ge-doped optical fibres in external beam radiotherapy dosimetry." Thesis, University of Surrey, 2012. http://epubs.surrey.ac.uk/845678/.

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The need for better characteristics of a radiation dosimeter arises from the requirement to verify the advanced techniques now employed in radiotherapy such as Intensity Modulated Radiation Therapy (IMRT), Intensity Guided Radiation Therapy (IGRT) and Cyberknife. To-date, one of the most promising dosimeter is thermoluminescent (TL) Ge-doped silica dioxide (SiO2) optical fibre. It has been established that it provides excellent spatial resolution, flexibility, modest cost, a nonhygroscopic nature, and excellent radiation response characteristics. In this study, the TL yield of 9 μm Ge-doped op

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Martial, Igor. "Systèmes laser pompés par diode à fibres cristallines : oscillateurs Er : yAG, amplificateurs Nd : yAG." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00705198.

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Au cours de cette thèse, nous nous intéressons à deux applications nécessitant des sources laser impulsionnelles : l'imagerie active et l'usinage laser. L'imagerie active nécessite des sources laser efficaces émettant dans la gamme de sécurité oculaire (entre 1,5 µm et 1,7 µm) à des cadence de l'ordre du kilohertz et produisant des énergies par impulsion de plusieurs millijoules. Les sources efficaces émettant dans la gamme de sécurité oculaire utilisent l'ion erbium. Cependant la structure électronique complexe de l'ion erbium entraîne de nombreux effets parasites qui limitent fortement l'éne

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Dajczgewand, Julian. "Optical memory in an erbium doped crystal : efficiency, bandwidth and noise studies for quantum memory applications." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS198/document.

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Le traitement quantique de l’information comme moyen de surmonter les limites de l’électronique classique a connu un développement rapide dans les deux dernières décennies. Plusieurs composants pour générer, traiter et envoyer l’information quantique sont nécessaires. Dans ce contexte, les mémoires quantiques optiques apparaissent comme des composantes principales capables de communiquer l’information quantique sur de longues distances en surmontant les pertes des fibres optiques dans un schéma de répéteur quantique. Durant la dernière décennie, plusieurs protocoles de stockage pour stocker l’

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Huang, Xuezhen. "Fabrication and optical properties of (I) erbium-doped nanowires containing germanium and/or zinc oxide and (II) porous germanium nanowires." [Fort Worth, Tex.] : Texas Christian University, 2010. http://etd.tcu.edu/etdfiles/available/etd-04282010-134727/unrestricted/Huang.pdf.

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PENNA, STEFANO. "Design processing and characterization of organic devices for optical communications." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2009. http://hdl.handle.net/2108/991.

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La recente esplosione dei servizi a larga banda e i limiti imposti dalla legge di Moore hanno spinto la ricerca verso il concetto di chip ottico integrato, inteso come un dispositivo che implementa le principali funzioni ottiche, tipicamente nella banda C, su di un'unica piattaforma. In questi dispositivi l'integrazione e la compattezza giocano un ruolo fondamentale. Tra i diversi materiali disponibili, i composti semiconduttori organici sono particolarmente attraenti perchè a basso costo di fabbricazione e particolarmente predisposti all'integrazione per via della loro struttura amorfa. Tra

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