Дисертації з теми "Waveguide component"
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Wilkinson, Peter John. "Novel mechanical alignment and component fabrication for wavelength-selective optical switches." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277801.
Повний текст джерелаKot, J. S. "Rectangular dielectric waveguide for millimetre wave components." Thesis, University of Bath, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374605.
Повний текст джерелаMcColl, Iain. "Radiating and coupling elements in waveguide planar array antennas." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/788.
Повний текст джерелаJahagirdar, Dhananjay R. "Non-leaky conductor-backed coplanar waveguide-fed microstrip patch antennas." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241874.
Повний текст джерелаGrigoropoulos, Nikolaos. "Novel substrate integrated waveguides and components." Thesis, University of Kent, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420827.
Повний текст джерелаFinegan, T. "Theoretical investigation of optical waveguide and fibre components." Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233848.
Повний текст джерелаWang, Hanyang. "Moment method analysis of slotted waveguide antennas incorporating finite element method." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1350.
Повний текст джерелаVukovic, Ana. "Fourier transformation analysis of optoelectronic components and circuits." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323106.
Повний текст джерелаTick, T. (Timo). "Fabrication of advanced LTCC structures for microwave devices." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514292507.
Повний текст джерелаTreen, Andrew S. "The fabrication and theoretical investigation of micromachined submillimetre-wave metal-pipe waveguide components." Thesis, University of Bath, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296619.
Повний текст джерелаMo, Tingting. "Coplanar waveguide components and their applications in microwave circuits /." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b21471514a.pdf.
Повний текст джерела"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy" Includes bibliographical references.
Balaji, Uma. "Field theory analysis and design of circular waveguide components." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ32732.pdf.
Повний текст джерелаOssorio, García Javier. "Development of New Tunable Passive Microwave Components in Waveguide Technology." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/166100.
Повний текст джерела[CA] La present tesis doctoral té com a objectiu el estudi, desenvolupament, diseny i fabricació de nous components pasius de microones, tals com els filtres i multiplexors que operen en les bandes d'alta freqüencia dels actuals i futurs satèl.lits de telecomunicació (bandes Ku, K i Ka) entre 12 i 40 GHz, Aquests components han de ser capaços d'oferir tant, respostes clàsiques sencilles com avançades (eliptiques), i que a més a més presenten una capacitat de resintonització (tant en termes de freqüència central com d'amplada de banda). Aquestos nous components pasius donaràn solució a les necesitats dels actuals sistemes espacials, que requereixen de majors taxes de transmissió de dades (senyals de major amplada de banda), així com de major flexibilitat en les frequencies de operació, per oferir en un mateix dispositiu distints serveis i prestacions. Per aquesta raó, es proposen tant modificacions a les estructures del filtres clàsics de microones actuals, com la introducció de noves estructures. Així mateix, també s'investigarà l'us dels tornells d'ajustament post-fabricació dels filtres com a tornells de sintonía metàl.lica i la introducció de tornells de sintonía realitzats amb diferents materials dielèctrics Es pretén, d'aquesta forma, la millora de les respostes del dispositius actuals; reduint la envergadura i els costos de producció (gràcies a la relaxació de les toleràncies de fabricació), abaratint d'aquesta forma la fabricació i futura operació dels filtres mateixos. Aprofitant aquestos nous dispositius es treballarà també en el disseny, fabricaçió i mesura de components més complexes, com poden ser els multiplexors de canal i els commutadors amb resposta selectiva en freqüencia, tots ells necessaris en els sistemes de comunicacions espacials i en íntima relació amb els filtres abans esmenats. Per analitzar, el desenvolupament de tots aquestos dispositius vindrà acompanyat d'una metodologia de disseny basada en l'us del Mapatge Espacial Agressiu (Aggressive Space Mapping, ASM), especialment adaptat als filtres en guia d'ona.
[EN] The main objective of this doctoral thesis is the study, development, design and manufacture of new passive microwave components in waveguide technology, such as filters and multiplexers, that operate in the high frequency bands of current and future telecommunication satellite payloads between 12 and 40 GHz (Ku, K and Ka bands). The new solutions developed must other both classic and advanced (elliptical) responses, as well as the possibility of being reconfigured both in terms of center frequency and bandwidth. The motivation for this research is to address the current and future needs of space communication systems which require higher data rate transmission (that is larger bandwidths), as well as flexibility with respect to the operating frequency to dynamic adaptation to possible changes in user demands. In this context, we propose in this thesis alternative microwave filter structures in metallic waveguide, as well as novel solutions. We explore different approaches to adjust the filter performance, using both traditional metallic tuning screws as well as tuning elements made with dierent dielectric materials. We also advance the state-of-the-art by developing more performing Space Mapping procedures for the design, optimization and tuning of the filter structures that we propose. The objective is to improve the response of the devices and reduce, at the same time, their manufacturing time and costs. As a fundamental element of our work, in addition to theoretical developments, we also apply the findings of our research to the design, manufacture and measurement of a number of more complex components, such as diplexers and integrated switches and filters. They are practical devices to demonstrate the ability of the novel filters that we propose to satisfy the requirements of current and future advanced satellite payloads.
Ossorio García, J. (2021). Development of New Tunable Passive Microwave Components in Waveguide Technology [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/166100
TESIS
Arrand, Helena Frances. "Optical waveguides and components based on porous silicon." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243510.
Повний текст джерелаGuled, Idil Mohamud Mohamed. "Acoustic transmission : waveguides with scattering or dissipative components." Thesis, Brunel University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272605.
Повний текст джерелаBIGELLI, FRANCESCO. "Technologies for the Integration of Waveguide Components and Antennas on Printed Circuit Boards." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245384.
Повний текст джерелаIn this research work I present the feasibility study on the realization of a class of devices in SIW (Substrate Integrated Waveguide) technology for ICT application at microwave frequencies. With this technology it is possible to obtain, by the traditional processes for the printed circuits manufacturing, integrated components with quality factors greater than the microstrip and the stripline. SIW technology is very promising because it permits to obtain compact, low cost and self-shielding guiding structures and hence, guides components. Although many papers, presented in literature, strengthen these qualities, this technology did not lead to an industrial production today, even at low volumes. This work is part of the formation project annexed to its research project, entitled “Integrated Waveguide (SIW) technologies development for microwave ICT applications” in collaboration with the Politecnico of Bari, Università Politecnica delle Marche and SOMACIS SpA, a worldwide PCB (Printed Circuit Board) industry with forty years of experience in the highly technological sector of high-mix and low-volume. As this hopeful technology allows a drastic reduction in size and costs, qualities that are well suited to the increasing market needs, the project aims to design and realize a class of product ranging from filter, hybrids, “frequency-shaping” components and antenna. SIW technology could also permit to produce in a large scale expensive and complicated products like the automotive and defense radars. Moreover, in the market of civil telecommunication, it could be possible to replace the standard and bulky TV dishes with planar array of antenna that are more competitive and could have a wide spread. Such array could also be fully integrated in the roof like it happens for the solar panels, this advantage could drive people to opt for these new concept of satellite antennas. Indeed, it seems to be realistic to foresee a market of thousands of components overlooking the proper motivation to the success of the project. The SIW technology permits to reproduce in a planar form, through rows of metallic holes, a traditional waveguide. Obviously, in these structures, the electromagnetic field travels into the dielectric and not in air. It is clear that this involves a sensible increase of the losses. Even if the dielectric losses are the dominant part, these are still enhanced from a high density of current localized in the metallic holes that constitute the lateral sidewalls. In recent years several Substrate Integrated Waveguide devices such as antennas [1-2], filters, and couplers [3-4, 5-6] have been reported in literature. SIW technology is a good technique for designing and fabricating microwave and millimeter-wave devices and circuits [7-21]. However, an industrial use of SIW components still requires an essential phase of systematic study. Therefore the first objective of this study consists in optimization of technologies most suitable for the realization of this components.
Young, P. R. "A study of coupled dielectric waveguides and their application to millimetre-wave components." Thesis, University of Kent, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245653.
Повний текст джерелаKarim, Abid. "Characterisation of locally pumped active waveguide components for optical integrated circuits." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332784.
Повний текст джерелаNaqshbandi, Ahmad Masood. "Evaporative self-assembly - a new approach to designing and fabricating photonic components." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/9512.
Повний текст джерелаHong, Binbin. "Photonic crystal millimetre wave and terahertz waveguides and functional components." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20998/.
Повний текст джерелаWosinski, Lech. "Technology for photonic components in silica/silicon material structure." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3556.
Повний текст джерелаThe main objectives of this thesis were to develop a lowtemperature PECVD process suitable for optoelectronicintegration, and to optimize silica glass composition forUV-induced modifications of a refractive index in PECVDfabricated planar devices. The most important achievement isthe successful development of a low temperature silicadeposition, which for the first time makes it is possible tofabricate good quality low loss integrated components whilekeeping the temperature below 250oC during the entirefabrication process. Two strong absorption peaks thatappear at1.5 mm communication window due to N-H and Si-H bonds have beencompletely eliminated by process optimization. This openspossibilities for monolithic integration with other,temperature sensitive devices, such as semiconductor lasers anddetectors, or polymer-based structures on the common siliconplatform. PECVD technology for low loss amorphous silicon inapplication to SiO2/Si based photonic crystal structures hasbeen also optimized to remove hydrogen incorporated during thedeposition process, responsible for the porosity of thedeposited material and creation of similar to silica absorptionbands.
Change of the refractive index of germanium doped silicaunder UV irradiation is commonly used for fabrication of UVinduced fiber Bragg gratings. Here we describe our achievementsin fabrication of fiber Bragg gratings and their application todistributed sensor systems. Recently we have built up a laserlab for UV treatment in application to planar technology. Wehave demonstrated the high photosensitivity of PECVD depositedGe-doped glasses (not thermally annealed) even without hydrogenloading, leading to a record transmission suppression of 47dBin a Bragg grating photoinduced in a straight buried channelwaveguide. We have also used a UV induced refractive indexchange to introduce other device modifications or functions,such as phase shift, wavelength trimming and control ofpolarization birefringence.The developed low temperature technology and the UVprocessing form a unique technology platform for development ofnovel integrated functional devices for optical communicationsystems.
A substantial part of the thesis has been devoted tostudying different plasma deposition parameters and theirinfluence on the optical characteristics of fabricatedwaveguides to find the processing window giving the besttrade-off between the deposition rate,chamber temperatureduring the process, optical losses and presence of absorptionbands within the interesting wavelength range. The optimalconditions identified in this study are low pressure (300-400mTorr), high dilution of silane in nitrous oxide and high totalflow (2000 sccm), low frequency (380 KHz) RF source and high RFpower levels (800-1000 W).
The thesis provides better understanding of the plasmareactions during the deposition process. RF Power is the keyparameter for increasing the rate of surface processes so as toaccommodate each atomic layer in the lowest energy statepossible. All the process conditions which favor a moreenergetic ion bombardment (i.e. low pressure, low frequency andhigh power) improve the quality of the material, making it moredense and similar to thermal oxide, but after a certain pointthe positive trend with increasing power saturates. As theenergy of the incoming ion increases, a competing effect setsin at the surface: ion induced damage and resputtering.
Finally, the developed technologies were applied for thefabrication of some test and new concept devices for opticalcommunication systems including multimode interference (MMI)-based couplers/splitters, state-of-the-art arrayed waveguidegrating-based multi/ demultiplexers, the first Bragg gratingassisted MMI-based add-drop multiplexer, as well as moreresearch oriented devices such as a Mach-Zehnder switch basedon silica poling and a Photonic Crystal-based coupler.
Keywords:silica-on-silicon technology, PECVD, plasmadeposition, photonic integrated circuits, planar waveguidedevices, UV Bragg gratings, photosensitivity, arrayed waveguidegratings, multimode interference couplers, add-dropmultiplexers.
Rezem, Maher [Verfasser]. "Replication of planar polymer micro-optical waveguides and components / Maher Rezem." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2019. http://d-nb.info/1182532713/34.
Повний текст джерелаStephens, D. "Millimeter-wave substrate integrated waveguides and components in thick-film technology." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/958/.
Повний текст джерелаBaig, Sarfaraz Niaz Ali. "Soft Lithographic Fabrication of Micro Optics and Integrated Photonic Components." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/179.
Повний текст джерелаKjellman, Jon Øyvind. "Fabrication and characterization of optical waveguide components in epitaxial (Pb,La)(Zr,Ti)O3 thin films." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9948.
Повний текст джерелаThis report presents a method for fabrication of ridge-type waveguide electro-optic modulators in 500 nm thick, c-oriented, epitaxial, (Pb0.92,La0.08)(Zr0.4,Ti0.6)O3 thin films on a MgO substrate. The method is based on ordinary photolitography and wet etching techniques with lift-off metallisation of gold electrodes. To achieve good input coupling of light the device end faces were polished using diamond lapping film swith grain sizes as small as 0.5 um. Several devices with both Mach-Zehnder electro-optic modulators and phase modulators with co-planar gold electrodes and an interaction length of L = 3 mm were fabricated using this method. These modulators were used to examine the electro-optic efect in the thin films at the wavelength 1.55 um. Coherent, linearly polarised light was coupled into the waveguide end face using tapered fibres while a modulation voltage was applied to the electrodes. The phase modulators were used as intensity modulators by exciting them with light polarised 45 degrees on the optical axis and placing a linear polariser at the output. Practical modulation was achieved using voltages as low as 46 V with the phase modulators and 80 V with the Mach-Zehnder modulators. Using a numerical curve fitting technique, the measured data was fitted to a proposed theoretical model for the modulators. The model was based on Jones matrix formalism and the assumption that the electro-optic effect in the thin films corresponds with the Pockels effect. Good fits were achieved indicating that the effect is indeed a Pockels effect and estimates of the Pockels coecient r51 ranged from 4.4 pm/V to 11 pm/V depending on the device. These values were obtained under the uncertain assumption that the birefringence of (Pb,La)(Zr,Ti)O3 is 0.005. It is found that if the actual value of the birefringence is lower, then r51 will also be lower than estimated. Based on previous works the Pockels coeficient was expected to be on the order or ~102 pm/V. The low measured values of r51 and the variation between films is believed to be due to the thin films being multi domain with a domain structure created by a stochastic process.
Castaldini, Davide. "Study, fabrication and characterization of segmented waveguides for advanced photonic components on Lithium Niobate." Nice, 2007. http://www.theses.fr/2007NICE4028.
Повний текст джерелаCastaldini, Davide <1978>. "Study, fabrication and characterization of segmented waveguides for advanced photonic components on lithium niobate." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/390/1/Castaldini_phd.pdf.
Повний текст джерелаCastaldini, Davide <1978>. "Study, fabrication and characterization of segmented waveguides for advanced photonic components on lithium niobate." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/390/.
Повний текст джерелаMarinins, Aleksandrs. "Polymer Components for Photonic Integrated Circuits." Doctoral thesis, KTH, Skolan för teknikvetenskap (SCI), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219556.
Повний текст джерелаQC 20171207
BATTISTUTTA, SIMONE. "Modeling of Inhomogeneous and Lossy Waveguide Components by the Segmentation Technique Combined with the BI-RME method." Doctoral thesis, Università degli studi di Pavia, 2019. http://hdl.handle.net/11571/1245807.
Повний текст джерелаAlmalkawi, Mohammad J. "Computer Aided Design of Microwave Front-End Components and Antennas for Ultrawideband Systems." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321653715.
Повний текст джерелаLai, Qun. "Silica on silicon waveguides with square diffused structure and their components for optical fiber communication /." [S.l.] : [s.n.], 1998. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12600.
Повний текст джерелаGerhard, Marko [Verfasser]. "Development and Characterization of Broadband Metallic Waveguides and Compact Functional Components for Terahertz Technology / Marko Gerhard." München : Verlag Dr. Hut, 2014. http://d-nb.info/1059330172/34.
Повний текст джерелаAbou, Khalil Alain. "Direct laser writing of a new type of optical waveguides and components in silver containing glasses." Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/33849.
Повний текст джерелаL'inscription laser directe est un domaine de recherche en croissance depuis ces deux dernières décennies, fournissant un moyen efficace et robuste pour inscrire directement des structures en trois dimensions (3D) dans des matériaux transparents tels que des verres en utilisant des impulsions laser femtosecondes. Cette technique présente de nombreux avantages par rapport à la technique de lithographie, qui se limite à la structuration en deux dimensions (2D) et implique de nombreuses étapes de fabrication. Cela rend la technique d’inscription laser directe bien adaptée aux nouveaux procédés de fabrication. Généralement, l’inscription laser dans les verres induit des changements physiques tels qu'un changement permanent de l'indice de réfraction localisé. Ces modifications ont été classées en trois types distincts:(type I, type II et type III). Dans ce travail, nous présentons un nouveau type de changement d'indice de réfraction, appelé type A qui est basé sur la création d’agrégats d'argent photo-induits. En effet, dans des verres dans lesquels sont incorporés des ions argent Ag+, lors de leur synthèse, l’inscription laser directe induit la création d’agrégats d’argent fluorescents Agmx+ au voisinage du voxel d’interaction. Ces agrégats modifient localement les propriétés optiques comme la fluorescence, la non-linéarité et la réponse plasmonique du verre. Ainsi, différents guides d'ondes, un séparateur de faisceau 50-50, ainsi que des coupleurs optiques ont été inscrits en se basant sur ce nouveau type A et complétement caractérisés. D'autre part, une étude comparative entre les deux types de guides d'ondes (type A et type I) est présentée, tout en montrant qu’en ajustant les paramètres laser, il est possible de déclencher soit le type I soit le type A. Enfin, en se basant sur des guides d’ondes de type A inscrits proche de la surface du verre, un capteur d'indice de réfraction hautement sensible a été inscrit dans une lame de verre de 1 cm de long. Ce capteur miniaturisé peut présenter deux fenêtres de détection d’indice, ce qui constitue une première mondiale. Les propriétés des guides d'ondes inscrits dans ces verres massifs ont été transposées à des fibres en forme de ruban, du même matériau contenant de l'argent. Les résultats obtenus dans ce travail de thèse ouvrent la voie à la fabrication de circuits intégrés en 3D et de capteurs à fibre basés sur des propriétés optiques originales inaccessibles avec des guides d’onde de type I standard.
Direct Laser Writing (DLW) has been an exponentially growing research field during the last two decades, by providing an efficient and robust way to directly fabricate three dimensional (3D) structures in transparent materials such as glasses using femtosecond laser pulses. It exhibits many advantages over the lithography technique, which is mostly limited to two dimensional (2D) structuring and involves many fabrication steps. This competitive aspect makes the DLW technique suitable for future technological transfer to advanced industrial manufacturing. Generally, DLW in glasses induces physical changes such as permanent local refractive index modifications that have been classified under three distinct types: (Type I, Type II & Type III). In silver containing glasses with embedded silver ions Ag+, DLW induces the creation of fluorescent silver clusters Agmx+ at the vicinity of the interaction voxel. In this work, we present a new type of refractive index change, called type A occurring in the low pulse energy regime that is based on the creation of the photo-induced silver clusters allowing the creation of new linear and nonlinear optical waveguides in silver containing glasses. Various waveguides, a 50- 50 Y beam splitter, as well as optical couplers, were written based on type A modification inside bulk glasses and further characterized. In addition, a comparitive study between type A and type I waveguides is presented, showing that finely tuning the laser parameters allows the creation of either type A or type I modifications inside silver containing glasses. Finally, based on type A near-surface waveguides, a highly sensitive refractive index sensor is created in a 1 cm glass chip, which could exhibit a pioneer demonstration of double sensing refractive ranges. The waveguiding properties observed and reported in the bulk of such silver containing glasses were transposed to ribbon shaped fibers of the same material. Those results pave the way towards the fabrication of 3D integrated circuits and fiber sensors with original fluorescent, nonlinear and plasmonic properties that are not accessible using the standard type I modification.
Abou, Khalil Alain. "Direct laser writing of a new type of optical waveguides and components in silver containing glasses." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0290/document.
Повний текст джерелаDirect Laser Writing (DLW) has been an exponentially growing research field during the last two decades, by providing an efficient and robust way to directly address three dimensional (3D) structures in transparent materials such as glasses using femtosecond laser pulses. It exhibits many advantages over lithography technique which is mostly limited to two dimensional (2D) structuring and involves many fabrication steps. This competitive aspect makes the DLW technique suitable for future technological transfer to advanced industrial manufacturing. Generally, DLW in glasses induces physical changes such as permanent local refractive index modifications that have been classified under three distinct types: (Type I, Type II & Type III). In silver containing glasses with embedded silver ions Ag+, DLW induces the creation of fluorescent silver clusters Agmx+ at the vicinity of the interaction voxel. In this work, we present a new type of refractive index change, called type A that is based on the creation of the photo-induced silver clusters allowing the creation of new linear and nonlinear optical waveguides in silver containing glasses. Various waveguides, a 50-50 Y beam splitter, as well as optical couplers, were written based on type A modification inside bulk glasses and further characterized. On the other hand, a comparison study between type A and type I waveguides is presented, showing that finely tuning the laser parameters allows the creation of either type A or type I modification inside silver containing glasses. Finally, based on type A near-surface waveguides, a highly sensitive refractive index sensor is created in a 1 cm glass chip, which could exhibit a pioneer demonstration of double sensing refractive ranges. The waveguiding properties observed and reported in the bulk of such silver containing glasses were transposed to ribbon shaped fibers of the same material. Those results pave the way towards the fabrication of 3D integrated circuits and fiber sensors with original fluorescent, nonlinear and plasmonic properties that are not accessible using the standard type I modification
Carceller, Candau Carlos. "Full-wave characterization of bi-dimensional cavities and its application to the design of waveguide filters and multiplexers." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/64089.
Повний текст джерела[ES] Actualmente, los sistemas de comunicaciones imponen unos requisitos muy estrictos sobre el equipamiento en la banda de microondas. El diseño de estos componentes está supeditado, frecuentemente, a la disponibilidad de herramientas de modelado electromagnético (EM) que sean capaces de analizar geometrías complejas. A pesar del amplio uso de herramientas CAE (computer-aided engineering) de propósito general para la verificación final de prototipos, su potencial aplicación durante el proceso de diseño es limitada. Los diseños óptimos exigen realizar una gran cantidad de simulaciones EM. Dado que las simulaciones con estas técnicas tienen un alto coste computacional, los diseñadores suelen optar por emplear herramientas software especializadas en las estructuras que diseñan. Por tanto, el desarrollo de nuevas herramientas más precisas y eficientes ayudará a reducir el tiempo de diseño de estos productos, y con ello los costes asociados. Además, permitirá abrir nuevas líneas de investigación para responder a los retos que plantean geometrías cada vez más complejas. Esta tesis se centra en el desarrollo de una herramienta de análisis EM para un tipo concreto de estructuras: cavidades bidimensionales de sección arbitraria. Es habitual encontrar este tipo de estructuras en la mayoría de componentes implementados en guía rectangular. Por tanto, el rango de aplicación de la teoría desarrollada en esta tesis es muy amplio. En concreto, se ha desarrollado una nueva formulación basada en métodos modales que permite realizar una caracterización de onda completa de estas estructuras de forma eficiente y precisa. Al aprovechar su simetría geométrica y electromagnética, la herramienta desarrollada puede minimizar los cálculos a realizar, consiguiendo grandes velocidades de computación pero manteniendo una alta precisión. Gracias a la integración de esta formulación dentro de una herramienta CAE basada en métodos modales, se ofrece la posibilidad a los diseñadores de resolver sistemas muy complejos que combinan este tipo de cavidades con otros componentes de geometrías distintas. Esta formulación se aplica, en primer lugar, al análisis y diseño de componentes pasivos comunes, tales como filtros, multiplexores y OMTs. Estos ejemplo validan la herramienta desarrollada, y demuestran la significativa mejora que supone el uso de esta nueva técnica con respecto a otros paquetes software de análisis electromagnético. Asimismo, al combinar esta formulación con la herramienta SPARK3D se abre la posibilidad de predecir la aparición de fenómenos de descarga de alta potencia en determinadas estructuras bidimensionales. A continuación, se proponen nuevas formas de implementar filtros cuasi-elípticos basados en la interconexión de cavidades bi-dimensionales. Se hace especial hincapié en la realización de múltiples ceros de transmisión mediante estructuras compactas que no requieran sintonía. Por una parte se estudian los filtros hybrid-folded rectangular waveguide. Este trabajo incluye una discusión en profundidad sobre distintas implementaciones de este tipo de filtros. En ella se consideran aspectos prácticos relacionados con su uso e implementación física, que ofrecen al diseñador unos criterios claros para elegir la estructura que más se ajuste a sus especificaciones. Por otra parte se presenta un nuevo obstáculo de naturaleza capacitiva muy compacto, que permite la realización de múltiples ceros de transmisión incluso en estructuras en línea. En ambos casos se incluyen ejemplos de aplicación y se describe la metodología seguida para su diseño. Finalmente, se expone un procedimiento sistemático para diseñar multiplexores de banda ancha. Para prevenir la generación de resonancias indeseadas se evitan, en la medida de lo posible, las interconexiones mediante tramos cortos de guía. Siguiendo una metodología simple se consigue un excelente punto inicial para su optimización. La te
[CAT] Els actuals sistemes de comunicacions sense fils imposen uns requisits molt estrictes sobre l'equipament de la banda de microones. El disseny d'aquests components està supeditat, frequentment, a la disponibilitat de ferramentes de modelatge electromagèntic (EM) que siguen capaços de gestionar geometries complexes. Tot i l'ampli ús de ferramentes CAE (computer-aided engineering) de propòsit general per a la verificació final de prototips, la seua aplicació durant el procés de disseny és limitada. Els dissenys òptims exigeixen realitzar una gran quantitat de simulacions. Les simulacions amb aquestes tècniques tenen un alt cost computacional, per tant els dissenyadors solen optar per utilitzar ferramentes software especialitzades en les estructures que dissenyen. Per tant, el desenvolupament de noves tècniques d'anàlisi més precises i eficients ajudarà a reduir el temps de desenvolupament d'aquests productes, i dels seus costos associats. A més permetrà obrir noves línies d'investigació per respondre els reptes que plantegen geometries cada vegada més complexes. Aquesta tesi es centra en el desenvolupament d'una ferramenta d'anàlisi EM per a un tipus concret d'estructures: cavitats bidimensionals de forma arbitraria. És habitual trobar aquestes estructures en la majoria de components implementats en guia rectangular. Per tant, l'àmbit d'aplicació de la teoria presentada en esta tesi és molt ampli. En concret, s'ha desenvolupat una nova formulació basada en mètodes modals que permet realitzar una caracterització d'ona completa d'aquestes estructures de forma eficient i precisa. Aprofitant la seua simetria geomètrica i electromagnètica, la ferramenta desenvolupada pot minimitzar els càlculs a realitzar, aconseguint grans velocitats de càlcul mantenint una alta precisió. Gràcies a la integració d'aquesta formulació dins d'una ferramenta CAE basada en mètodes modals, s'ofereix la possibilitat als dissenyadors de resoldre sistemes molt complexos que combinen aquest tipus de cavitats amb altres components de diferent geometria. Aquesta formulació s'aplica, en primer lloc, a l'anàlisi i disseny de components passius comuns: filtres, multiplexors i OMTs. Aquests exemples serveixen per a validar la ferramenta desenvolupada, així com demostrar la significativa millora que suposa l'ús d'aquesta nova tècnica respecte d'altres paquets software d'anàlisi electromagnètic. Així mateix, mitjançant la combinació d'aquesta formulació amb la ferramenta SPARK3D s'obri la possibilitat de predir l'aparició de fenòmens de descàrrega d'alta potència en estructures bidimensionals. A continuació, es proposen noves formes d'implementar filtres quasi el-líptics en guia d'ona basats en la interconnexió de cavitats bidimensionals. Es fa especial èmfasi en la realització de múltiples zeros de transmissió mitjançant estructures compactes que no requereixen de sintonia. D'una banda s'estudien els filtres hybrid folded rectangular waveguide. Aquest treball inclou una discussió en profunditat sobre diferents implementacions d'aquest tipus de filtres. S'hi consideren aspectes pràctics relacionats amb el seu ús i implementació física, que ofereixen al dissenyador uns criteris clars per triar l'estructura que més s'ajuste a les seues especificacions. D'altra banda es presenta un nou obstacle de naturalesa capacitiva extremadament compacte, que permet la realització de múltiples zeros de transmissió fins i tot en estructures en línia. En els dos casos s'inclouen exemples d'aplicació i es descriu la metodologia seguida per al seu disseny. Finalment, s'exposa un procediment sistemàtic per dissenyar multiplexors de banda ampla. Per prevenir la generació de ressonàncies no desitjades s'eviten les interconnexions amb trams de guia curts. Seguint una metodologia simple, basada en fórmules analítiques i simulacions electromagnètiques, s'aconsegueix un excel-lent punt inicial per a l'optimització.
Carceller Candau, C. (2016). Full-wave characterization of bi-dimensional cavities and its application to the design of waveguide filters and multiplexers [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/64089
TESIS
Cross, Lee W. "Design of Microwave Front-End Narrowband Filter and Limiter Components." Thesis, The University of Toledo, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3588122.
Повний текст джерелаThis dissertation proposes three novel bandpass filter structures to protect systems exposed to damaging levels of electromagnetic (EM) radiation from intentional and unintentional high-power microwave (HPM) sources. This is of interest because many commercial microwave communications and sensor systems are unprotected from high power levels. Novel technologies to harden front-end components must maintain existing system performance and cost. The proposed concepts all use low-cost printed circuit board (PCB) fabrication to create compact solutions that support high integration.
The first proposed filter achieves size reduction of 46% using a technology that is suitable for low-loss, narrowband filters that can handle high power levels. This is accomplished by reducing a substrate-integrated waveguide (SIW) loaded evanescent-mode bandpass filter to a half-mode SIW (HMSIW) structure. Demonstrated third-order SIW and HMSIW filters have 1.7 GHz center frequency and 0.2 GHz bandwidth. Simulation and measurements of the filters utilizing combline resonators prove the underlying principles.
The second proposed device combines a traditional microstrip bent hairpin filter with encapsulated gas plasma elements to create a filter-limiter: a novel narrowband filter with integral HPM limiter behavior. An equivalent circuit model is presented for the ac coupled plasma-shell components used in this dissertation, and parameter values were extracted from measured results and EM simulation. The theory of operation of the proposed filter-limiter was experimentally validated and key predictions were demonstrated including two modes of operation in the on state: a constant output power mode and constant attenuation mode at high power. A third-order filter-limiter with center frequency of 870 MHz was demonstrated. It operates passively from incident microwave energy, and can be primed with an external voltage source to reduce both limiter turn-on threshold power and output power variation during limiting. Limiter functionality has minimal impact on filter size, weight, performance, and cost.
The third proposed device demonstrates a large-area, light-weight plasma device that interacts with propagating X-band (8-12 GHz) microwave energy. The structure acts as a switchable EM aperture that can be integrated into a radome structure that shields enclosed antenna(s) from incident energy. Active elements are plasma-shells that are electrically excited by frequency selective surfaces (FSS) that are transparent to the frequency band of interest. The result is equivalent to large-area free-space plasma confined in a discrete layer. A novel structure was designed with the aid of full-wave simulation and was fabricated as a 76.2 mm square array. Transmission performance was tested across different drive voltages and incidence angles. Switchable attenuation of 7 dB was measured across the passband when driven with 1400 Vpp at 1 MHz. Plasma electron density was estimated to be 3.6 × 10 12 cm-3 from theory and full-wave simulation. The proposed structure has potential for use on mobile platforms.
Liu, Liu. "Design, Fabrication, and Characterization of Nano-Photonic Components Based on Silicon and Plasmonic Material." Doctoral thesis, Kista : School of Information and Communication Technology, Kungliga Tekniska högskolan (KTH), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4193.
Повний текст джерелаHussaini, Sheena. "Integrated Magnetic Components for RF Applications." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1431951933.
Повний текст джерелаBerenguer, Verdú Antonio José. "Analysis and design of efficient passive components for the millimeter-wave and THz bands." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/84004.
Повний текст джерелаEsta tesis aborda problemas actuales en el análisis y diseño de componentes pasivos en las bandas de onda milimétrica y Terahercios (THz). Se presentan nuevas técnicas de análisis y modelado de estructuras complejas, procedimientos de diseño, e implementación práctica de dispositivos pasivos avanzados. La primera parte de la tesis se dedica a componentes pasivos de THz. Actualmente no se disponen de guías de onda adecuadas a THz debido a que ambos, metales y dieléctricos, introducen grandes pérdidas. En consecuencia, no es adecuado escalar las estructuras metálicas cerradas usadas en microondas, ni las guías dieléctricas usadas a frecuencias ópticas. Entre un gran número de recientes propuestas, la Single Wire Waveguide (SWW) destaca por su baja atenuación y casi nula dispersión. No obstante, como guía superficial, la SWW presenta difícil excitación y radiación en curvas. El uso de un recubrimiento dieléctrico, creando la Dielecric-Coated Single Wire Waveguide (DCSWW), alivia estos inconvenientes, pero las ventajas anteriores se pierden y nuevos problemas aparecen. Hasta la fecha, no se han encontrado soluciones adecuadas para la radiación en curvas de la SWW. Además, se echa en falta una caracterización rigurosa de ambas guías. Esta tesis presenta, por primera vez, un análisis modal completo de SWW y DCSWW, adecuado a la banda de THz. Este análisis es aplicado posteriormente para evitar el problema de la radiación en curvas. Se presentan y validan experimentalmente diversas estructuras y procedimientos de diseño. La segunda parte de la tesis abarca componentes pasivos de ondas milimétricas. Actualmente, estos componentes sufren una importante degradación de su respuesta debido a que resulta difícil asegurar contacto metálico y alineamiento adecuados para la operación a longitudes de onda tan pequeñas. Además, la absorción dieléctrica incrementa notablemente a estas frecuencias. En consecuencia, tanto guías metálicas huecas como líneas de transmisión planares convencionales presentan gran atenuación, siendo necesario considerar topologías alternativas. Las Gap Waveguides (GWs), basadas en una estructura periódica que introduce un efecto de Electromagnetic Bandgap, resultan muy adecuadas puesto que no requieren contacto entre partes metálicas y evitan las pérdidas en dieléctricos. No obstante, a pesar del potencial de las GWs, varias barreras impiden la consolidación y uso universal de esta tecnología. Por una parte, la compleja topología de las GWs dificulta el proceso de diseño dado que las simulaciones de onda completa consumen mucho tiempo y no existen actualmente métodos de análisis y diseño apropiados. Por otra parte, es necesario evidenciar el beneficio de usar GWs mediante dispositivos GW de altas prestaciones y comparativas adecuadas con estructuras convencionales. Esta tesis presenta diversos métodos de análisis eficientes, modelos, y técnicas de diseño que permitirán la síntesis de dispositivos GW sin necesidad de un conocimiento profundo de esta tecnología. Asimismo, se presentan varios filtros de banda estrecha operando en las bandas Ka y V con altas prestaciones, así como una comparativa rigurosa con la guía rectangular.
Aquesta tesi aborda problemes actuals en relació a l'anàlisi i disseny de components passius en les bandes d'ona mil·limètrica i Terahercis. Es presenten noves tècniques d'anàlisi i modelatge d'estructures complexes, procediments de disseny, i implementació pràctica de dispositius passius avançats. La primera part de la tesi es focalitza en components passius de THz. Actualment no es disposen de guies d'ona adequades a THz causa que tots dos, metalls i dielèctrics, introdueixen grans pèrdues. En conseqüència, no és adequat escalar les estructures metál·liques tancades usades en microones, ni les guies dielèctriques usades a freqüències òptiques. Entre un gran nombre de propostes recents, la Single Wire Waveguide (SWW) destaca per la seua baixa atenuació i quasi nul·la dispersió. No obstant això, com a guia superficial, la SWW presenta difícil excitació i radiació en corbes. L'ús d'un recobriment dielèctric, creant la Dielecric-Coated Single Wire Waveguide (DCSWW), alleuja aquests inconvenients, però els avantatges anteriors es perden i nous problemes apareixen. Fins a la data, no s'han trobat solucions adequades per a la radiació en corbes de la SWW. A més, es troba a faltar una caracterització rigorosa d'ambdues guies. Aquesta tesi presenta, per primera vegada, un anàlisi modal complet de SWW i DCSWW, adequat a la banda de THz. Aquest anàlisi és aplicat posteriorment per evitar el problema de la radiació en corbes. Es presenten i validen experimentalment diverses estructures i procediments de disseny. La segona part de la tesi es centra en components passius d'ones mil·limètriques. Actualment, aquests components pateixen una important degradació de la seua resposta a causa de que resulta difícil assegurar contacte metàl·lic i alineament adequats per a l'operació a longituds d'ona tan menudes. A més, l'absorció dielèctrica incrementa notablement a aquestes freqüències. En conseqüència, tant guies metàl·liques buides com línies de transmissió planars convencionals presenten gran atenuació, sent necessari considerar topologies alternatives. Les Gap Waveguides (GWs), basades en una estructura periòdica que introdueix un efecte de Electromagnetic Bandgap, resulten molt adequades ja que no requereixen contacte entre parts metàl·liques i eviten les pèrdues en dielèctrics. No obstant, tot i el potencial de les GWs, diverses barreres impedixen la consolidació i ús universal d'aquesta tecnologia. D'una banda, la complexa topologia de les GWs dificulta el procés de disseny atés que les simulacions d'ona completa consumeixen molt de temps i no existeixen actualment mètodes d'anàlisi i disseny apropiats. D'altra banda, és necessari evidenciar el benefici d'utilitzar GWs mitjançant dispositius GW d'altes prestacions i comparatives adequades amb estructures convencionals. Aquesta tesi presenta diversos mètodes d'anàlisi eficients, models, i tècniques de disseny que permetran la síntesi de dispositius GW sense necessitat d'un coneixement profund d'aquesta tecnologia. Així mateix, es presenten diversos filtres de banda estreta operant en les bandes Ka i V amb altes prestacions, així com una comparativa rigorosa amb la guia rectangular.
Berenguer Verdú, AJ. (2017). Analysis and design of efficient passive components for the millimeter-wave and THz bands [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/84004
TESIS
Rathnayake-Arachchige, Dilshani. "Metallisation and structuring of low temperature Co-fired ceramic for micro and millimetre wave applications." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19343.
Повний текст джерелаNikkhah, Hamdam. "Enhancing the Performance of Si Photonics: Structure-Property Relations and Engineered Dispersion Relations." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37144.
Повний текст джерелаAli, Mohamed Ali Sayed Ahmed Ahmed. "Développement de nouveaux composants passifs multicouches et l'implémentation d'une matrice de Butler large-bande et compacte en technologie GIS." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0027/document.
Повний текст джерелаMultibeam antennas have become a key element in nowadays wireless communication systems where increased channel capacity, improved transmission quality with minimum interference and multipath phenomena are severe design constraints. These antennas are classified in two main categories namely adaptive smart antennas and switched-beam antennas. Switched-beam antennas consist of an elementary antenna array connected to a Multiple Beam Forming Network (M-BFN). Among the different M-BFNs, the Butler matrix has received particular attention as it is theoretically lossless and employs the minimum number of components to generate a given set of orthogonal beams (provided that the number of beams is a power of 2). However, the Butler matrix has a main design problem which is the presence of path crossings that has been previously addressed in different research works. Substrate Integrated Waveguide (SIW) features interesting characteristics for the design of microwave and millimetre-wave integrated circuits. SIW based components combine the advantages of the rectangular waveguide, such as the high Q factor (low insertion loss) and high power capability while being compatible with low-cost PCB and LTCC technologies. Owing to its attractive features, the use of SIW technology appears as a good candidate for the implementation of BFNs. The resulting structure is therefore suitable for both waveguide-like and planar structures. In this thesis, different novel passive components (couplers and phase shifters) have been developed exploring the multi-layer SIW technology towards the implementation of a two-layer compact 4×4 Butler matrix offering wideband performances for both transmission magnitudes and phases with good isolation and input reflection characteristics. Different techniques for the implementation of wideband fixed phase shifters in SIW technology are presented. First, a novel waveguide-based CRLH structure is proposed. The structure is based on a single-layer waveguide with shunt inductive windows (irises) and series transverse capacitive slots, suitable for SIW implementations for compact phase shifters. The structure suffers relatively large insertion loss which remains however within the typical range of non-lumped elements based CRLH implementations. Second, the well-known equal length, unequal width SIW phase shifters is discussed. These phase shifters are very adapted for SIW implementations as they fully exploit the flexibility of the SIW technology in different path shapes while offering wideband phase characteristics. To satisfy good return loss characteristics with this type of phase shifters, the length has to be compromised with respect to the progressive width variations associated with the required phase shift values. A twolayer, wideband low-loss SIW transition is then proposed. The transition is analyzed using its equivalent circuit model bringing a deeper understanding of its transmission characteristics for both amplitude and phase providing therefore the basic guidelines for electromagnetic optimization. Based on its equivalent circuit model, the transition can be optimized within the well equal-length SIW phase shifters in order to compensate its additional phase shift within the frequency band of interest. This twolayer wideband phase shifter scheme has been adopted in the final developed matrix architecture.This transition is then exploited to develop a three-layer, multiply-folded waveguide structure as a good candidate for compensated-length, variable width, low-loss, compact wideband phase shifters in SIW technology. Novel two-layer SIW couplers are also addressed. For BFNs applications, an original structure for a two-layer 90° broadband coupler is developed. The proposed coupler consists of two parallel waveguides coupled together by means of two parallel inclined-offset resonant slots in their common broad wall. A complete parametric study of the coupler is carried out including the effect of the slot length, inclination angle and offset on both the coupling level and the transmission phase. The first advantage of the proposed coupler is providing a wide coupling dynamic range by varying the slot parameters allowing the design of wideband SIW Butler matrix in two-layer topology. In addition, previously published SIW couplers suffer from direct correlation between the transmission phase and the coupling level, while the coupler, hereby proposed, allows controlling the transmission phase without significantly affecting the coupling level, making it a good candidate for BFNs employing different couplers, such as, the Nolen matrix. A novel dual-band hybrid ring coupler is also developed in multi-layer Ridged SIW (RSIW) technology. This coupler has been jointly developed with Tarek Djerafi in a collaboration scenario with Prof. Ke Wu from the Ecole Polytechnique de Montréal. The coupler has an original structure based on two concentric rings in RSIW topology with the outer ring periodically loaded with radial, stub-loaded transverse slots. A design procedure is presented based on the Transverse Resonance Method (TRM) of the ridged waveguide together with the simple design rules of the hybrid ring coupler. A C/K dual band coupler with bandwidths of 8.5% and 14.6% centered at 7.2 GHz and 20.5 GHz, respectively, is presented. The coupler provides independent dual band operation with low-dispersive wideband operation. Finally, for the Butler matrix design, the two-layer SIW implementation is explored through a two-fold enhancement approach for both the matrix electrical and physical characteristics. On the one hand, the two-layer topology allows an inherent solution for the crossing problem allowing therefore more flexibility for phase compensation over a wide frequency band. This is achieved by proper geometrical optimization of the surface on each layer and exploiting the SIW technology in the realization of variable width waveguides sections with the corresponding SIW bends. On the other hand, the two-layer SIW technology is exploited for an optimized space saving design by implementing common SIW lateral walls for the matrix adjacent components seeking maximum size reduction. The two corresponding 4×4 Butler matrix prototypes are optimized, fabricated and measured. Measured results are in good agreement with the simulated ones. Isolation characteristics better than -15 dB with input reflection levels lower than -12 dB are experimentally validated over 24% frequency bandwidth centered at 12.5 GHz. Measured transmission magnitudes and phases exhibit good dispersive characteristics of 1dB, around an average value of -6.8 dB, and 10° with respect to the theoretical phase values, respectively, over the entire frequency band
Chiu, Hua-Kung, and 邱華恭. "The Component of Waveguide on SOI-based." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/97950084602924163327.
Повний текст джерела國立中央大學
光電科學研究所
93
In this work, we have performed the simulation, fabrication and characterization of the silicon on insulator (SOI). 1×8 power splitters, Array Waveguide Grating(AWG), taper waveguides and comb drive attenuators are studied. Three types of 1×8 power splitters are investigated, including 1×8 multi-mode interference(MMI) splitters, 1×2×2×2 MMI splitters and 1×8 Y-branch splitters. Losses, uniformity and device sizes are compared for different splitters. Among these three kinds of structures, 1×8 power MMI splitters possess the best performance. For the results of AWG, the accurate distance control of array waveguides, output waveguides and length of star coupler can ameliorate the performance of the AWG. We also propose a taper structure attached to waveguides to reduce the coupling losses. In the comb drive attenuator, the component is fabricated in SOI wafer. Novel comb drive attenuator structures are proposed to solve the sticking problem.
Chen, chien-Hsiang, and 陳建翔. "Fabrication of Bragg grating waveguide component by different types of polymer material and its characteristic comparison." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/34221391690631262653.
Повний текст джерела南台科技大學
電子工程系
95
In this thesis, we created an unique process combining with soft molding, photolithography and holography interference to fabricate an polymer Bragg reflection waveguide component. First we made a waveguide component through photolithography and then combined with micro-contact printing of non-photolithography, micro-molding in capillaries and replica molding to fabricate the molding of the polymer waveguide component. Afterwards, we utilized formed polymer OG waveguide molding along with different diffraction rates of polymer materials to perform the optical transmission layer Finally, we used the process of thick layer photo-resist of photolithography associated with holography interference to implement a polymer Bragg reflective waveguide component. The molding of this waveguide component is reproducible and is able used for mass production. It has some advantages including easy production, lowest optical loss and low cost. The experiment results are measured and observed by AFM and SEM. Whereas the optical transmitting features are measured through the OSA.
Zandieh, Alireza. "Integrated System and Component Technologies for Fiber-Coupled MM-Wave/THz Systems." Thesis, 2012. http://hdl.handle.net/10012/7157.
Повний текст джерелаLu, Jen-Tang, and 呂任棠. "Terahertz Pipe-Waveguide-Based Components." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33782590073534329501.
Повний текст джерела國立臺灣大學
光電工程學研究所
99
THz technology has been proved to have high potential in a variety of fields such as high-speed telecommunications, bio imaging, molecular detection, material property study, anti-terrorism applications, and astronomical remote sensing. To facilitate THz technology, various kinds of THz fibers and waveguides have been extensively investigated in the past decade. Two years ago, we previously proposed a circular pipe waveguide for low-loss THz waveguiding. With commercial Teflon pipes, an attenuation constant lower than 0.001 cm-1 had been achieved. In this thesis, we proposed several kinds of THz pipe-waveguide-based components for the purpose of constructing compact and flexible THz systems. We first investigated the bending loss characteristics of the pipe waveguides. It is found that the circular pipe waveguides possess magnificent flexibility and unexpected low bending loss. In order to construct THz polarization controllers and directional couplers, we modified the circular pipe waveguides into square and rectangular ones. The proposed rectangular waveguides not only suffer low attenuation (~0.002 cm-1), but also possess polarization-sensitivity to guided THz waves. Moreover, we established a THz leaky mode directional coupler with two square pipe waveguides. The proposed directional coupler is polarization-sensitive. Because of the anti-resonant reflecting guiding principle of the pipe waveguides, the directional coupler works most efficiently in the minimal-attenuation wavelength regime. We further devised a simple butt coupler setup to combine circular pipe waveguides and rectangular ones. With butt coupling method, square and rectangular pipe waveguides can be high-efficiently (almost 100%) coupled with circular ones. It is expected that these low loss, polarization-sensitive waveguide-based components have high potential in future THz applications.
Zhang, Yang. "Advanced polysiloxane waveguide components for telecommunications." Master's thesis, 2007. http://hdl.handle.net/1885/151401.
Повний текст джерелаHuang, Chi-Hung, and 黃棋鴻. "Design and Improvement of Silicon Optical Waveguide Components." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/66vh4d.
Повний текст джерела國立臺灣科技大學
電子工程系
106
Based on the prior work developed in our group, this thesis presents the improved design of the silicon photonic components realized with both silicon on insulator (SOI) and standard bulk CMOS platforms. The simulation methods for investigating the mode evolution and performance of photonic integrated circuits (PICs) will be introduced. The design process leads to the improvement of the devices on silicon-on-insulator (SOI) platforms including optical filters based on Mach-Zehnder interferometers and sub-wavelength gratings, as well as the grating coupler, ring resonators, and sub-wavelength grating waveguide on the standard 28-nm CMOS platform. The design rules for each platform are adopted in the design processes. The design of optical waveguide devices using the standard 28-nm CMOS process provided by a semiconductor foundry is demonstrated for the first time in this work. The optical waveguide is fabricated using the thin polysilicon layer in the CMOS process without modifying any standard process conditions. Because of the very thin waveguide layer, the motivations here are to investigate the performance of waveguides with very-low confinement factor and to reduce the optical loss of the polysilicon layer. However, the pitch of the grating coupler in the layout is actually twice the original design value. This causes the difficulty in device characterization. We verify the grating design and correct the angle for fiber coupling. Preliminary results are obtained for subsequent design and optimization.
Salem, Hesari Sara. "Substrate integrated waveguide antenna systems." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/10564.
Повний текст джерелаGraduate