Dissertations / Theses on the topic 'Fibre optique chalcogénure microstructurée'
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Caillaud, Céline. "Élaborations et caractérisations de fibres optiques microstructurées en verres de chalcogénures pour le moyen infrarouge." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S062/document.
Full textChalcogenide glasses combine several properties : large transparency in the infrared range, a high refractive index (n>2) and strong non-linear properties. The realization of microstructured optical fibers (MOFs) exacerbates non-linear effects more particularly by varying the opto-geometrical parameters of the fibers (d and Λ). Thus, single-mode propagation can be obtained and also generation of non-linear effects. The realization of high purity chalcogenide glasses is needed. In fact, absorption bands limiting the transparency of the fibers must be identified and minimized. For this, monitoring and qualification of components used in the synthesis of glasses should be undertaken. A protocol of synthesis and purification by heat treatment was implemented in this direction. The technique to elaborate MOFs is the casting method. It consists of flowing a glass on a silica mold. The geometry is the negative shape of the desired fiber. This method allows the realization of multimode or single-mode fiber in the 1-10 μm window. The realization of infrared sources was developed in the manuscript. The generation of a supercontinuum with a suspended-core fiber has been presented and also by the realization of a quantum cascade laser (QCL) coupled into a singlemode fiber. In addition, a polarization-maintaining fiber (PMF) having a group birefringence of the order of 10-3 was developed through the evolution of the silica mold. In addition, an optical coupler, an all-solid fiber and an infrared bundle were achieved during this thesis
Fortier, Coraline. "Génération de sources optiques fibrées très hautes cadences et caractérisations de fibres optiques microstructurées en verre de Chalcogénure." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00605129.
Full textBalme, Coraline. "Génération de sources optiques fibrées très hautes cadences et caractérisation de fibres optiques microstructurées en verre de Chalcogénure." Thesis, Dijon, 2011. http://www.theses.fr/2011DIJOS022/document.
Full textThis memory of thesis s' registered voter in the context of the FUTUR project financed by l'ANR and concerning the development of optical finctions fot the high bit-rate transmissions in the Network heart and carries on very high rates optical fibers sources generation and the optical chalcogenide microstructured fiber charaterization. For this purpose, we study the linear and non-linear characteristics of microstructured chalcogenide fibers conceived and realized in various collaborations within the framework of the ANR FUTUR project. For that a great number of characterizations methods were developed giving a comparison between a standard single mode fiber and there microstructured chalcogenide fibers. For exemple, an interferometric setup for the chromatic dispersion measurement for short sample, or many experimental setup allowing the nonlinear properties characterizations as of these fibers (Raman scattering, nonlinear Kerr Coefficient). The second part of this memory presents the settling of sinusoidal beat conversion into a high bit rate generation method. It is shown in this manuscript that this technique was exploited with readiest of its limits, by obtaining extremely short pulses and by very high bit-rate. The pulses train at very high rates were characterized by an experimental device SHG-FROG. A demonstration of the multiplication of the bit-rate by two at summer shown by Talbot effect
Fortier, Coraline. "Génération de sources optiques fibrées très hautes cadences et caractérisation de fibres optiques microstructurées en verre de Chalcogénure." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00692345.
Full textNguyen, Thanh Nam. "Etude de composants optiques à base de fibres optiques non-linéaires." Phd thesis, Université Rennes 1, 2008. http://tel.archives-ouvertes.fr/tel-00365863.
Full textEn ce qui concerne la modélisation de la propagation non-linéaire, ce travail passe en revue plusieurs méthodes de résolution de l'équation non-linéaire de Schrödinger (ENLS) connues sous le nom de méthodes split-step Fourier. Pour trois de ces méthodes, une modification astucieuse de l'algorithme de résolution numérique de l'ENLS permettant d'augmenter l'efficacité de la méthode est proposée. Ce travail présente également une nouvelle méthode split-step Fourier permettant de résoudre l'ENLS avec une précision choisie.
Pour la partie concernant la caractérisation de fibres optiques non-linéaires, ce travail présente, pour la première fois, les caractérisations optiques de fibres optiques microstructurées en verre de chalcogénure et démontre leur fort potentiel pour des applications non-linéaires. Des caractérisations non-linéaires de fibres optiques microstructurées en verre de silice présentant une faible atténuation et un gain Raman record sont également présentées. Une nouvelle méthode pour mesurer simultanément la dispersion chromatique et le coefficient non-linéaire de fibres optiques, basée sur l'effet de compression soliton, est proposée.
Concernant l'étude du régénérateur de Mamyshev, ce travail propose une étude théorique conduisant à l'élaboration d'un abaque pour le dimensionnement du régénérateur et permettant d'étudier le rôle du pré-filtrage et le mécanisme de gigue temporelle introduite par le régénérateur. L'étude expérimentale du régénérateur met en évidence le rôle néfaste de l'effet Brillouin et du mélange à quatre ondes sur les performances d'un régénérateur à 40 Gbit/s. Une nouvelle architecture de régénérateur, basée sur l'utilisation d'un compresseur d'impulsions, est proposée afin d'éliminer ces effets indésirables. Son efficacité est démontrée au cours d'une expérience de régénération en boucle à recirculation.
Hey, Tow Kenny. "Laser Brillouin à fibre microstructurée en verre de chaleogénure." Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-00860216.
Full textLe, Sy Dat. "Traitement tout-optique du signal à base de nouvelles fibres optiques non-linéaires." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-01016801.
Full textNguyen, Thanh Nam. "Étude de composants optiques à base de fibres optiques non-linéaires." Rennes 1, 2008. http://www.theses.fr/2008REN1E003.
Full textThis work deals with the possibility of using silica holey fibres (SHF) and chalcogenide holey fibres (CHF) for applications in all-optical regeneration at 40 Gbit/s. The original results obtained during this work are arranged in three parts. Firstly, this work reviews several methods, known as the split-step Fourier (SSF) methods, to solve the non-linear Schrödinger equation (NLSE) in order to simulate nonlinear propagation in optical fibres. For three of these methods, modifications in their algorithms to increase their efficiency have been proposed. This work also presents a new SSF method which can solve the NLSE with a given accuracy. Secondly, this work presents, for the first time, the optical characterizations of CHF fibres and their strong potential for non-linear applications. The optical characterizations of SHF fibres, especially with a strong Raman gain, are also presented. A novel method, based on the effect of soliton compression, to measure simultaneously the dispersion and the nonlinear coefficient in an optical fibre, is also proposed. . Lastly, this work proposes an abacus for the dimensioning of the regenerator at 40 Gbit/s. It points out the role of pre-filtering and studies the mechanism of power-dependent-induced jitter introduced by the regenerator. This work proposes also a new architecture of regenerator at 40 Gbit/s, based on the use of a compressor which exploits self-phase modulation, to eliminate some undesirable effects such as Brillouin scattering and intra-channel four-wave mixing. The efficiency of the architecture is shown experimentally within a recirculating loop
Coulombier, Quentin. "Fibres microstructurées en verres de chalcogénures pour la génération de super continuum et le transport de puissance dans les fenêtres atmosphériques 3-5 et 8-12 µm." Rennes 1, 2010. https://tel.archives-ouvertes.fr/tel-00531237.
Full textTwo interests in chalcogenide glasses (CG) are their transparency in the infrared and their non linear properties. The microstructured optical fibers (MOF) allow single mode signal guiding and/or exacerbate non linear effects. CG MOF permit to obtain single mode and/or non linear fibers in the infrared region. There are many potential applications for MOF. They can be used to build lasers, for spectrometry of for nulling interferometry, and for signal regeneration, supercontinuum sources, or military applications. The elaboration of CG MOF made by a casting method is explained. This method permits to obtain the lowest optical losses in CG MOF. Many MOF were fabricated in As-Se, Te-As-Se glasses. Various fiber geometries were fabricated to cover all the applications. Then, chalcogenide MOF are tested to obtain self phase modulation and Raman scattering. Besides, a strongly non linear composition, with good thermal properties to be molded, was determined using a design of experiments
Toupin, Perrine. "Fibres optiques microstructurées en verre de chalcogénure pour la détection d'espèces chimiques et la conversion de longueurs d'onde." Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-00910072.
Full textEl, Amraoui Mohammed. "Fibres optiques microstructurées chalcogénures fortement non linéaires à base AS2S3 : vers de nouvelles sources supercontinuum infrarouges." Phd thesis, Université de Bourgogne, 2010. http://tel.archives-ouvertes.fr/tel-00679941.
Full textMouawad, Oussama. "Génération de supercontinuum infrarouge et enjeux de vieillissement au sein de fibres optiques à coeur suspendu hautement non linéaires en verre de chalcogénures à base de sulfures." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS072/document.
Full textThe work reported in this thesis deals with the fabrication of suspended core chalcogenide microstructured optical fibers (MOFs) for supercontinuum generation (SCG) beyond 6 μm. In this context, As2S3-based suspended-core MOFs were fabricated under vacuum, and loss threshold of 1-2 dB/m at 2.9µm were systematically registered. In addition, MOFs were designed with core diameter ranging from 1.5 to 3.5µm, allowing therefore to control the MOF's dispersive properties and to shift corresponding zero dispersion wavelength to 2.0-2.5 µm range. SCG experiments were performed by pumping the fabricated MOFs in their anomalous dispersion regime by means of tunable femtosecond laser source. Simultaneously, numerical simulations were carried out in order to elucidate the non-linear dynamics and their limitations. As part of this work, we have registered a broad SC extended over 2.0 µm on As2S3 MOF. However, we have identified a phenomenon of glass-fiber aging upon exposure to atmospheric conditions. Through a preventive protection procedure based on storage of MOF under dry atmosphere, we have successfully expanded the bandwidth of the SC up to 3.5 µm.The aging phenomenon appears to be a limiting factor which prevents the extension of the SC in the IR region. It is in this context that extensive studies of aging of materials have been conducted. In this work, we were proved the aging process of As2S3 glass system and resulting impact on both chemical and optical properties.In a second part of this work, we succeeded to manufacture new arsenic-free chalcogenide fibers based on Ge-S-Se, responding to European recommendations (REACH)
Coulombier, Quentin. "Fibres microstructurées en verres de chalcogénures pour la génération de supercontinuum et le transport de puissance dans les fenêtres atmosphériques 3-5 et 8-12 µm." Phd thesis, Université Rennes 1, 2010. http://tel.archives-ouvertes.fr/tel-00531237.
Full textMeneghetti, Marcello. "Microstructured optical fibers based on chalcogenide glasses for mid-IR supercontinuum generation." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S081.
Full textIn the framework of the SUPUVIR project, whose objective is to improve supercontinuum sources from the ultraviolet to the mid infrared, this work is focused on the development and fabrication of mid-IR optical fibers. More specifically the objective set was to realize high quality infrared (in the 2-12 μm wavelength range) fibers based on chalcogenide glasses, with a dispersion profile tailored by combining glass sciences and innovative fiber shaping techniques, to be used for mid- IR supercontinuum generation. In order to be suitable for this application, the fiber design needs to be a best compromise between nonlinear parameters (mainly controlled by the core size and chalcogenide composition), position of the zero dispersion wavelength (depending on desired pump wavelength), power handling properties and breadth of the transmission window. In this thesis, the production and characterization of microstructured fibers is detailed, starting from the choice and purification of the most proper chalcogenide glasses up to the production of a working prototype of commercial mid infrared supercontinuum fiber source, spanning from 2 to 10 μm, and to its application to spectroscopy. In addition, the development of the first chalcogenide graded index (Grin) fiber reported in literature is described, together with its characterization and the application of its production technique to the fabrication of Grin microlenses
Désévédavy, Frédéric. "Fibres optiques micro-structurées à base de verres de chalcogénures pour applications dans le domaine des télécommunications et le moyen IR." Rennes 1, 2008. http://www.theses.fr/2008REN1S063.
Full textThe work reported in this thesis deals with the experimental investigation of chalcogénide glasses microstructured fibres also known as photonic crystal fibre (PCF). Chalcogenide glasses are original materials with a large transparency window in the mid-infrared, high linear and non linear refractive indices. PCF are a new class of optical fibres which show novel optical properties and lead to great interest in the scientific community. First of all an efficient way of purification of these glasses is developed, as a result single index fibres with low attenuation are obtained (<1 dB/m). Then, the chalcogenide glasses FCP fabrication process we developed during this work is demonstrated to work and to be repeatable. Near and mid infrared optical characterizations are made on these fibres and compared to numerical simulations. Non linear effects as Raman scattering or self phase modulation are demonstrated at 1. 55 µm. Their strength shows the advantages of the chalcogenide glasses and PCF combination. Finally the first hollow core chalcogenide glasses PCF are fabricated and a pretty good control of their geometry is obtained
Baillot, Maxime. "Mélange à quatre ondes multiple pour le traitement tout-optique du signal dans les fibres optiques non linéaires." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S068/document.
Full textFour-wave mixing is a phase-sensitive nonlinear effect that arouses interest, particularly in the fields of frequency comb generation and all-optical signal processing. As an example, frequency combs can be produced thanks to a cascaded four-wave mixing process. In this case, N waves can interact with each other through the optical Kerr effect, and one has to take into account all the possible interactions to be able to adequately model the process. During my PhD thesis, I was interested in modeling the so-called multiple four-wave mixing process, in which any number N of waves can interact with each other. I proposed a general formulation that allows to easily identify all the four-wave mixing terms originating from all the possible combinations of wave coupling and their associated phase-mismatch terms. I validated this approach through the theoretical and experimental study of a multiple four-wave mixing process in a nonlinear optical fiber. Thanks to the developed model, I then proposed a theoretical study of the phase-sensitive frequency conversion process, which permits to demultiplex the quadrature components of an optical signal. In the literature, this process was first experimentally demonstrated in several nonlinear devices using four pump waves. I demonstrated that only three pump waves were required to successfully perform the experiment, and I determined the simple analytical relations from which the adequate experimental parameters (namely, the amplitudes and phases of the pump waves) could be deduced. I finally validated this study by experimentally demonstrating a phase-sensitive frequency conversion process with only three pump waves, and I theoretically studied the influence of chromatic dispersion on the performance of this frequency converter. Finally, I characterized some chalcogenide microstructured optical fibers that were fabricated in the framework of a collaboration with Perfos, the Institut des Sciences Chimiques de Rennes, and SelenOptics. I set up a test bench based on the four-wave mixing process in order to measure the chromatic dispersion and nonlinear coefficient of some optical fibers
LE, PERSON Jenny. "Verres de sulfures: spectroscopie des ions de terres-rares, fibres microstructurées et nouvelles compositions." Phd thesis, Université Rennes 1, 2004. http://tel.archives-ouvertes.fr/tel-00009279.
Full textCalvet, Pierre. "Mise en forme spatiale dans une fibre optique microstructurée pour la réalisation d'amplificateurs lasers tout fibrés pour les pilotes des lasers de puissance." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10113/document.
Full textSpatial beam shaping is an important topic for the lasers applications. For various industrial areas (marking, drilling, laser-matter interaction, high-power laser seeding…) the optical beam has to be flattened. Currently, the state of the art of the beam shaping: “free-space” solutions or highly multimode fibers, are not fully suitable. The first ones are very sensitive to any perturbations and the maintenance is challenging, the second ones cannot deliver a coherent beam. For this reason, we present in this manuscript a microstructured optical single-mode fiber delivering a spatially flattened beam. This “Top-Hat” fiber can shape any beam in a spatially coherent beam what is a progress with respect to the highly multimode fibers used in the state of the art. The optical fibers are easy to use and very robust, what is a strong benefit with respect to the “free-space” solutions. Thanks to this fiber, we could realize an all-fiber multi-stage laser chain to amplify a 10 ns pulse to 100 µJ. Moreover the temporal, spectral and spatial properties were preserved. We adapted this “Top-Hat” fiber to this multi-stage laser chain, we proved the capability and the interest of this fiber for the spatial beam shaping of the laser beams in highly performing and robust laser systems
Beugnot, Jean-Charles. "La diffusion Brillouin dans les fibres optiques microstructurées." Phd thesis, Université de Franche-Comté, 2007. http://tel.archives-ouvertes.fr/tel-00296632.
Full textCharpentier, Frédéric. "Développement de fibres optiques et guides d'ondes infrarouges dédiés à la surveillance des sites de stockage du CO2." Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00443994.
Full textRoy, Aude. "Architectures de sources lasers blanches à fibres optiques microstructurées actives." Limoges, 2008. https://aurore.unilim.fr/theses/nxfile/default/4aaca4ba-e8fe-4494-9e83-92ff7575d558/blobholder:0/2008LIMO4035.pdf.
Full textCurrently supercontinuum sources, which are compact, low-cost and emitting in the visible, combine microstructured fiber to a pulsed microlaser. In these systems, the spectral power density rarely exceeds ten μW/nm. A solution to this problem is to exploit the optical amplification. A new concept of nonlinear active air/silica microstructured optical fiber with an air cladding was developed optimizing the guidance of a multimode pump in the internal cladding while a core ensuring the creation of a spectral enlargement under 1064 nm nanoseconde pulsed pumping. A prototype of this optical fiber then was manufactured. Amplifiers and lasers architectures have been developed from the optical fiber. The results validate the proposed principle
Tombelaine, Vincent. "Etude de rayonnements à large bande spectrale induits dans les fibres optiques microstructurées air-silice." Limoges, 2007. https://aurore.unilim.fr/theses/nxfile/default/3a75631c-da2c-4abb-922b-d1d032113bf1/blobholder:0/2007LIMO4023.pdf.
Full textThe investigations reported here concerns the generation of supercontinua in air-silica microstructured optical fibres. The development of a new system based on a double excitation (fundamental and harmonic) of nonlinear fibre allowed to obtain a supercontinuum in the infra-red and visible range. After a systematic study of the phenomenon, it was shown that the broadenings in the infra-red and in visible domains were generated by soliton propagations and cross phase modulation respectively. Then two new innovating methods, resulting from the double pumping device, were demonstrated. The first technique uses the second harmonic generation obtained directly in the fibre. The second one is based on a particular intermodal four wave mixing. These studies were carried out for the development of diagnosis tools for the flow cytometry and the nonlinear CARS imaging
Tchahame, Nougnihi Joel Cabrel. "Diffusion Brillouin dans des fibres optiques étirées et microstructurées." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2049/document.
Full textThis PhD thesis focuses on the fundamental aspects of Brillouin scattering in chalcogenidemicrofibers and silica photonic crystal fibers with wavelength-scale solid core. Through experimentalinvestigations and numerical simulations, we have demonstrated that the Brillouin gain inchalcogenide microfiber can reach a value 150 to 250 times higher than in conventional opticalfibers. Moreover, we have reported the generation of multipeaked Brillouin spectra in a long taperedbirefringent photonic crystal fiber. A further investigation of these spectra shows that the multiresonantbehavior arises both from the excitation of hybrid acoustic waves and the fiber tapering.Another significant work of this thesis is the evidence of surface acoustic waves in small-core photoniccrystal fibers with large air filling fraction. Our results show specifically that this new type of scatteringis extremely sensitive to the air-hole microstructure geometry. Finally, these works contribute toa better understanding of Brillouin scattering in ultrathin optical fiber, paving the way towards therealization of new optoacoustic components for telecommunications and sensors
Moizan, Virginie. "Étude de l'amplification laser en bande II dans les fibres de verres chalcogénures." Phd thesis, Université Rennes 1, 2008. http://tel.archives-ouvertes.fr/tel-00341553.
Full textCe travail de thèse s'inscrit dans la thématique « élaboration de sources lumineuses pour le moyen infrarouge ». Il présente une approche originale puisqu'il allie élaboration des matériaux, caractérisation spectroscopique et modélisation du milieu amplificateur laser. Cette étude, à l'interface entre la chimie des matériaux vitreux et l'optique, s'intéresse à la faisabilité de sources laser fibrées en verres de chalcogénures dopés terres rares pour l'émission entre 3 et 5 µm.
L'objectif de ce travail est d'évaluer le potentiel amplificateur des fibres de verre Ge20Ga5Sb10S65 dopées erbium ou dysprosium entre 4 et 5 µm. Pour ceci, une étude spectroscopique a été effectuée sur le matériau massif. Puis, des fibres optiques à saut d'indice et monoindices ont été réalisées et caractérisées optiquement. Enfin, les paramètres obtenus ont été utilisés pour construire un modèle et simuler le fonctionnement d'un amplificateur laser à fibre Ge20Ga5Sb10S65 dopé Er3+ pompé par diode à 807 nm et opérant à 4,6 µm.
Hage, Charles-Henri. "Sources optiques fibrées pour applications biomédicales." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00907642.
Full textPalma, Giuseppe. "Design of microlaser in medium infrarer wavelengnth range for biomedicine and environmental monitoring." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S017/document.
Full textOptical micro-resonators represent one of the most important devices in photonics. A special kind is constituted by the WGM resonators, i.e. devices with circular symmetry such as spheres, rings, disks and toroids. They are characterized by very small dimensions, exceptionally quality factor and very low modal volume becoming a valuable alternative to the traditional optical micro-resonators, such as Fabry-Pérot cavities. These devices allow applications in several fields, such as sensing, optical filtering and nonlinear optics. In particular, different applications in biology and medicine, molecular spectroscopy, environmental monitoring, astronomy and astrophysics are feasible in Mid-Infrared wavelength range. For example, it includes a lot of strong vibrational transitions that act as “fingerprints” of many bio-molecules and organic species allowing the develop of innovative spectroscopic applications and novel sensors. In addition, the earth's atmosphere is transparent in two atmospheric transmission windows at 3–5 μm and 8–13 μm and then applications such as remote explosive detection, e.g. in airports and for border control, and covert communication systems are feasible. The wide transparency window of chalcogenide glasses in Mid-Infrared makes possible the development of several devices. Chalcogenide glasses are characterized by good mechanical strength and chemically durability in water and atmosphere. Furthermore, the high refractive index, high quantum efficiency, the low phonon energy and high rare-earth solubility enables the emissions at long wavelengths.In this thesis, the design of innovative chalcogenide devices for applications in Mid-Infrared is investigated using an ad-hoc home-made computer code. The devices are based on three kinds of micro-resonators: microspheres, micro-disks and microbubbles. The WGM resonators are efficiently excited by using tapered fiber and ridge waveguides. A novel design procedure is developed using the particle swarm optimization approach (PSO). It allows to maximize the gain of an amplifier based on an erbium-doped microsphere lasing at 2.7 μm.An innovative technique in order to characterize the spectroscopic properties of rare-earth is developed integrating the WGM electromagnetic investigation with PSO algorithm. The method is based on two subsequent steps: in the first one, the geometrical parameters are recovered, in the second one, the spectroscopic parameters. The recovered values are affected by an error less than that provided by high-cost measurement instruments. Furthermore, the procedure is very versatile and could be applied to develop innovative sensing systems.Interesting applications could be obtained exciting the micro-resonator by a tapered fiber with two identical LPGs on the sides. Indeed the LPGs can select the fiber modes coupling with the WGM resonator. Using different pairs of identical LPGs operating in different wavelength bands, it is possible to selective couple different micro-resonators by using the same optical fiber. An ad-hoc computer code is developed and validated and it demonstrated the feasibility of a microbubble glucose sensor.In order to obtain a compact and cost-saving light source in Mid-Infrared, rare-earth doped micro-disk are investigated. A computer code is developed in order to simulate a rare-earth doped micro-disk coupled to two ridge waveguide, one at signal wavelength and the other one at pump wavelength. The model is validated using an erbium-doped micro-disk emitting at 4.5 μm. A very promising device for application in Mid-Infrared is obtained using a praseodymium-doped micro-disk emitting at 4.7 μm