Dissertationen zum Thema „Integrated Sensing and Communications“
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Bemani, Ali. „Affine Frequency Division Multiplexing (AFDM) for Wireless Communications“. Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS610.pdf.
Der volle Inhalt der QuelleIn the realm of next-generation wireless systems (beyond 5G/6G), the vision is clear: to support a broad range of services and applications. This includes ensuring reliable communications in environments marked by high mobility, such as high-speed railway systems and various vehicular communications. Despite the deployment of various multicarrier techniques like orthogonal frequency division multiplexing (OFDM) and single-carrier frequency division multiple access (SC-FDMA) in standardized communication systems, the challenge persists. These techniques, while effective in time-invariant frequency selective channels, face performance degradation in high mobility scenarios due to the destruction of orthogonality among subcarriers caused by significant Doppler frequency shifts. Addressing this, the search for new, robust modulation techniques is paramount. It stands as a key area of investigation aiming to resolve the reliable communications issue for next-generation wireless networks within doubly-selective wireless channels. In this thesis, a novel solution, affine frequency division multiplexing (AFDM), is proposed. This new chirp-based multicarrier waveform is based on the discrete affine Fourier transform (DAFT), a variant of the discrete Fourier transform characterized with two parameters that can be adapted to better cope with doubly dispersive channels. This thesis provides a comprehensive investigation into the principles of AFDM within high mobility communications. It provides insight into the explicit input-output relation in the DAFT domain, unveiling the consequential impact of AFDM parameters. The manuscript details the precise setting of DAFT parameters, ensuring a full delay-Doppler representation of the channel. Through analytical demonstrations, it asserts that AFDM optimally achieves the diversity order in doubly dispersive channels due to its full delay-Doppler representation. The thesis also proposes two low-complexity detection algorithms for AFDM, taking advantage of its inherent channel sparsity. The first is a low complexity MMSE detector based on LDL factorization. The second is a low complexity iterative decision feedback equalizer (DFE) based on weighted maximal ratio combining (MRC) of the channel impaired input symbols received from different paths. Additionally, the thesis presents an embedded channel estimation strategy for AFDM systems, leveraging AFDM's ability to achieve full delay-Doppler representation of the channel. In this approach, an AFDM frame contains a pilot symbol and data symbols, with zero-padded symbols employed as guard intervals to prevent interference. A practical channel estimation algorithm based on an approximate maximum likelihood (ML) approach and compatible with this pilot scheme is also provided. The thesis concludes by delving into the expanded applications of AFDM, specifically in integrated sensing and communication (ISAC) and extremely high frequency (EHF) band communications. It is demonstrated that to identify all delay and Doppler components linked with the propagation medium, one can use either the full AFDM signal or only its pilot part consisting of one DAFT domain symbol and its guard interval. Furthermore, the chirp nature of AFDM allows for unique and simple self-interference cancellation with a single pilot, eliminating the need for costly full-duplex methods. The thesis also highlights AFDM's efficient performance in high-frequency bands (with or without mobility), where the maximal spreading of its signal in time and frequency ensures a coverage gain. Unlike other waveforms, AFDM not only provides maximal time-frequency spreading but also ensures robust and efficient detection, characterized by one-tap equalization and resilience to carrier frequency offset (CFO) and phase noise
Theurer, Michael Andreas Davy [Verfasser], Martin [Akademischer Betreuer] Schell, Martin [Gutachter] Schell und Frank [Gutachter] Peters. „Electroabsorption modulated lasers and hybridly integrated lasers for communication and sensing / Michael Andreas Davy Theurer ; Gutachter: Martin Schell, Frank Peters ; Betreuer: Martin Schell“. Berlin : Technische Universität Berlin, 2021. http://d-nb.info/1238141013/34.
Der volle Inhalt der QuelleCook, Benjamin Stassen. „Vertical integration of inkjet-printed RF circuits and systems (VIPRE) for wireless sensing and inter/intra-chip communication applications“. Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51844.
Der volle Inhalt der QuelleDandin, Marc Péralte. „Towards integrated fluorescence sensing“. College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7811.
Der volle Inhalt der QuelleThesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Ayerra, Raquel, Manuel Jimenez und Asier Vega. „Integrated Marketing Communications in Advertising“. Thesis, Halmstad University, School of Business and Engineering (SET), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-852.
Der volle Inhalt der QuelleThis research is made with the aim of find out how Iberostar communicates its values through Offline and Online advertising campaigns and if those campaigns send the same message to the target audience
Сагер, Людмила Юріївна, Людмила Юрьевна Сагер, Liudmyla Yuriivna Saher, Алла Миколаївна Дядечко, Алла Николаевна Дядечко und Alla Mykolaivna Diadechko. „Integrated marketing communications: theoretical bases“. Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/16300.
Der volle Inhalt der QuelleKunzelman, Jill Nicole. „Polymers with Integrated Sensing Capabilities“. Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1238086140.
Der volle Inhalt der QuelleSoltanalian, Mojtaba. „Signal Design for Active Sensing and Communications“. Doctoral thesis, Uppsala universitet, Avdelningen för systemteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-230655.
Der volle Inhalt der QuelleLith, Joris van. „Novel integrated optical sensing platforms for chemical and immuno-sensing“. Enschede : University of Twente [Host], 2005. http://doc.utwente.nl/58010.
Der volle Inhalt der QuelleRandell, Damian P. „Integrated antenna diplexer for mobile communications“. Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402528.
Der volle Inhalt der QuelleMao, Chunxu. „Integrated filtering antennas for wireless communications“. Thesis, University of Kent, 2017. https://kar.kent.ac.uk/69475/.
Der volle Inhalt der QuelleLi, Huanlu. „Integrated photonic devices for data communications“. Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682683.
Der volle Inhalt der QuelleSibson, Philip. „Quantum secured communications with integrated photonics“. Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705479.
Der volle Inhalt der QuelleHobson, Paula Lee. „Integrated marketing communications at community colleges“. abstract and full text PDF (free order & download UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453583.
Der volle Inhalt der QuelleMacken, Stephen. „Integrated Optical Solutions for Ubiquitous Sensing“. Doctoral thesis, Linköpings universitet, Tillämpad Fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-63709.
Der volle Inhalt der QuelleCleary, Alison. „Integrated optical technologies for analytical sensing“. Thesis, University of Glasgow, 2004. http://theses.gla.ac.uk/6607/.
Der volle Inhalt der QuelleKreidly, Fikrie, Abdikadar Aden und Adnan Tvrtkovic. „Integrated Marketing Communications : A quantitative study of the perceptions of integrated marketing communications in the Swedish market“. Thesis, Linnéuniversitetet, Institutionen för marknadsföring (MF), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35476.
Der volle Inhalt der QuelleCapdevila, Cascante Santiago. „RFID multiantenna systems for wireless communications and sensing“. Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/116854.
Der volle Inhalt der QuelleGiza, Patryk J. Giza. „Fusion of Sensing and Backscatter Communications via OFDM“. Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1470337743.
Der volle Inhalt der QuelleNair, Girish. „Communications within a computer integrated manufacturing environment“. Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020049/.
Der volle Inhalt der QuelleChamberlain, Adam W. „Integrated Surface-Plasmon Waveguides for Optical Communications“. UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/258.
Der volle Inhalt der QuelleBennecer, Abdeldjalil. „Low cost integrated lasers for data communications“. Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609254.
Der volle Inhalt der QuelleSchaaf, Kristin Leigh. „Composite materials with integrated embedded sensing networks“. Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3307537.
Der volle Inhalt der QuelleTitle from first page of PDF file (viewed July 23, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 116-120).
Ma, Hanbin. „Impedance based integrated circuits for biological sensing“. Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648847.
Der volle Inhalt der QuelleKelly, Devin WW. „A Practical Distributed Spectrum Sensing System“. Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/378.
Der volle Inhalt der QuelleJin, Xian. „Integrated optical devices for free-space optical communications“. Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17406.
Der volle Inhalt der QuelleMetcalfe, Christian Todd 1974. „MediaJacket : an integrated clothing based personal communications system“. Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/62093.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 46-47).
Recent developments in fabric based conductive embroidered input devices has created the opportunity for the next generation of wearable computing. This thesis presents a preliminary attempt to develop a wearable, multi-purpose, extensible, IP device that uses flexible fabric based circuitry for its user interface. It integrates a suite of advanced communications devices into a standard PolarTecTMjacket using an embedded personal computer for its controller. Users wear the MediaJacket similarly to normal clothing, and can use a diverse set of applications that include IP telephony, two-way pager-like email, an MP3 audio player, and a contactless "interface pocket" for handling input data streams from external devices. By embedding advanced electronics into clothing using an RF connection for tetherless internet connectivity, this research aims to reduce the stigma of using technology by creating a more personalized user experience. It is our hope, that as the size and cost of the MediaJacket's components come down, this research will help people better to better integrate technology into their lives.
by Christian Todd Metcalfe.
S.M.
Marriott, A. P. „An integrated approach to image sensing and processing“. Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293261.
Der volle Inhalt der QuelleHannel, Thaddaeus S. „PATTERN RECOGNITION INTEGRATED SENSING METHODOLOGIES (PRISMS) IN PHARMACEUTICAL PROCESS VALIDATION, REMOTE SENSING AND ASTROBIOLOGY“. UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/751.
Der volle Inhalt der QuellePruessner, Marcel Werner. „Indium phosphide based optical waveguide MEMS for communications and sensing“. College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2731.
Der volle Inhalt der QuelleThesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Delvecchio, Matthew David. „Enhancing Communications Aware Evasion Attacks on RFML Spectrum Sensing Systems“. Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99792.
Der volle Inhalt der QuelleMaster of Science
Deep learning has started infiltrating many aspects of society from the military, to academia, to commercial vendors. Additionally, with the recent deployment of 5G technology, connectivity is more readily accessible than ever and an increasingly large number of systems will communicate with one another across the globe. However, cybersecurity and electronic warfare call into question the very notion of privacy and confidentiality of data and communication streams. Deep learning has further improved these intercepting capabilities. However, these deep learning systems have also been shown to be vulnerable to attack. This thesis exists at the nexus of these two problems, both machine learning and communication security. This work expands upon adversarial evasion attacks meant to help elude signal classification at a deep learning-enabled eavesdropper while still providing reliable communications to a friendly receiver. By doing so, this work both provides a new methodology that can be used to conceal communication information from unwanted parties while also highlighting the glaring vulnerabilities present in machine learning systems.
Oliveira, Ricardo Jorge Figueiredo. „Novel techniques and devices for optical communications and sensing technologies“. Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23653.
Der volle Inhalt der QuelleHoje em dia, a tecnologia de fibra óptica está a ser amplamente usada nas áreas de telecomunicações e sensores. Historicamente, as qualidades das fibras ópticas poliméricas (POFs) têm sido menosprezadas devido à popularidade das fibras óticas de vidro. Tal facto advém maioritariamente da sua elevada atenuação. No entanto, os materiais que compõem as POFs têm vindo a melhorar significativamente nestes últimos anos. Nesse sentido, a emergência de novas técnicas e dispositivos têm vindo a ser demonstradas/os. Considerando o campo das telecomunicações, as POFs estão a crescer rapidamente em aplicações de redes de acesso. Além disso, o advento da operação monomodo e das redes de Bragg em POF estão a ser amplamente explorados em aplicações de sensores e portanto, este tipo de tecnologia tenderá a ser uma realidade num futuro próximo. Devido à necessidade de criar uma conexão de baixa perda entre fibra óptica de vidro e polimérica, será demonstrada uma nova técnica capaz de produzir terminais de POF de alta qualidade, num processo rápido, fácil e semiautomático. A conectorização destes tipos de fibras será também analisada nesta dissertação. No seguimento desta tese serão desenvolvidos dois sistemas de gravação de redes de Bragg em POF. Num dos sistemas será usado o tradicional laser de HeCd com operação nos 325 nm, sendo que noutro será usado o laser de KrF com operação nos 248 nm. Os resultados mostrarão a capacidade de gravar redes de Bragg em POF em apenas alguns segundos, contrariamente às várias dezenas de minutos necessários com o laser de 325 nm. Com base no sucesso dos resultados, o sistema de gravação que opera nos 248 nm será usado para fabricar redes de Bragg noutros tipos de fibras, incluindo as de índice em degrau, micro-estruturadas e sem bainha. A gravação de redes de Bragg de excelente qualidade em POFs de elevada birrefringência também será apresentada. A separação entre picos de ressonância irá ser usada para estimar a birrefringência de fase, que será então comparada com a obtida por simulações numéricas e com recurso ao método de varredura de comprimento de onda. As redes de Bragg produzidas pelos métodos anteriores serão então caracterizadas à deformação, temperatura, pressão, humidade e índice de refracção. Os resultados serão comparados com a literatura e com aqueles encontrados teoricamente. Um dispositivo de interferência multimodal feito pela conexão de duas fibras ópticas monomodo de vidro a uma fibra óptica multimodo de polímero, será usado para demonstrar a medição de deformação e temperatura. As capacidades de absorção de água, oferecidas pelo material à base de polimetilmetacrilato serão usadas para medir humidade. No final desta dissertação, um sensor híbrido composto por um dispositivo de interferência multimodal, baseado em POF e contendo uma rede de Bragg, demonstrará a capacidade de medir deformação, temperatura e índice de refracção. A propriedades de baixa absorção de água por parte do material que compõe a fibra polimérica será usada para demonstrar insensibilidade à humidade por parte do sensor.
Nowadays, fiber optic technology is being widely employed in communication and sensing areas. Historically, the qualities of polymer optical fibers (POFs) have been overwhelmed by the popularity of the silica optical fibers. This has been mainly due to the POFs higher transmission loss. However, in last years, POF materials are improving their performance. Therefore, the emergence of new devices and techniques have been demonstrated. Considering the communications field, POFs are growing rapidly in fiber to the home applications. Additionally, the advent of single mode operation and fiber Bragg gratings in POFs are being widely explored in several sensing applications. Consequently, this technology will tend to be a reality in a near future. Due to the need of a low loss connection between silica and polymer optical fibers, it will be demonstrated a new technique capable to produce POF terminals of high quality in an easy, fast and semi-automated process. The connectorization of these types of fibers will be then analysed in this dissertation. The development of two Bragg grating inscription systems for POFs will also be explored in this thesis. One of the systems will employ the traditional HeCd laser operating at 325 nm, while the other will use the KrF laser operating at 248 nm. Results will show the capability to write Bragg gratings in a POF in few seconds, contrary to the several tens of minutes reported for the 325 nm radiation. Based on the success of the results, the 248 nm inscription setup will be used to inscribe Bragg gratings in other types of POFs, including step-index, microstructured, and unclad POFs. The inscription of a high quality Bragg grating in a high-birefringence POF will also be presented and the phase birefringence arising from the Bragg peak separation will be compared with the numerical simulations togheter with the wavelength scanning method. The fiber Bragg gratings produced through the previous methods will be characterized to strain temperature, pressure, humidity and refractive index. Results will be compared with literature and with the ones found theoretically. A multimode interference device made by sandwiching a multimode POF between two single mode silica fibers will be used to demonstrate the ability to measure strain and temperature. The water absorption capabilities offered by the polymethylmethacrylate material will be used to measure humidity. At the end of this dissertation, a hybrid sensor composed of a POF based multimode interference device, comprising a fiber Bragg grating, will demonstrate the capability to measure strain, temperature and refractive index. The low water absorption properties of the material that composes the POF will be used to demonstrate a POF sensor with humidity insensitiveness.
Lu, Guojun. „Graphics and video communications over an integrated services network“. Thesis, Loughborough University, 1989. https://dspace.lboro.ac.uk/2134/28220.
Der volle Inhalt der QuelleYin, Dongliang. „Integrated hollow core waveguide devices for optical sensing applications /“. Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.
Der volle Inhalt der QuelleSzajda, Kenneth S. (Kenneth Stanley). „A high resolution integrated circuit biomedical temperature sensing system“. Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11846.
Der volle Inhalt der QuelleVita.
Includes bibliographical references (p. 226-235).
by Kenneth S. Szajda.
Ph.D.
Hauke, Adam J. „An Integrated System for Sweat Stimulation, Sampling and Sensing“. University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535371796736114.
Der volle Inhalt der QuelleMessenger, Robert K. „Integrated Piezoresistive Sensing for Feedback Control of Compliant MEMS“. Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2115.pdf.
Der volle Inhalt der QuelleLiu, Qiankun. „SiGe photonic integrated circuits for mid-infrared sensing applications“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS166/document.
Der volle Inhalt der QuelleMid-infrared (mid-IR) spectroscopy is a nearly universal way to identify chemical and biological substances, as most of the molecules have their vibrational and rotational resonances in the mid-IR wavelength range. Commercially available mid-IR systems are based on bulky and expensive equipment, while lots of efforts are now devoted to the reduction of their size down to chip-scale dimensions. The use of silicon photonics for the demonstration of mid-IR photonic circuits will benefit from reliable and high-volume fabrication to offer high performance, low cost, compact, lightweight and power consumption photonic circuits, which is particularly interesting for mid-IR spectroscopic sensing systems that need to be portable and low cost. Among the different materials available in silicon photonics, Germanium (Ge) and Silicon-Germanium (SiGe) alloys with a high Ge concentration are particularly interesting because of the wide transparency window of Ge up to 15 µm. In this context, the objective of this thesis is to investigate a new Ge-rich graded SiGe platform for mid-IR photonic circuits. Such new plateform was expected to benefit from a wide transparency wavelength range and a high versatility in terms of optical engineering (effective index, dispersion, …). During this thesis, different waveguides platforms based on different graded profiles have been investigated. First it has been shown that waveguides with low optical losses of less than 3 dB/cm can be obtained in a wide wavelength range, from 5.5 to 8.5 µm. A proof of concept of sensing based on the absorption of the evanescent component of the optical mode has then been demonstrated. Finally, elementary building blocs have been investigated. The first Bragg mirror-based Fabry Perot cavities and racetrack resonators have been demonstrated around 8 µm wavelength. A broadband dual-polarization MIR integrated spatial heterodyne Fourier-Transform spectrometer has also been obtained. All these results rely on material and device design, clean-room fabrication and experimental characterization. This work was done in the Framework of EU project INsPIRE in collaboration with Pr. Giovanni Isella from Politecnico Di Milano
DEMATTEIS, NICCOLÒ. „Integrated ground-based remote sensing sensors for glaciological monitoring“. Doctoral thesis, Università degli studi di Pavia, 2020. http://hdl.handle.net/11571/1317327.
Der volle Inhalt der QuelleKoch, Thomas Bertold. „Computation of wave propagation in integrated optical devices“. Thesis, University College London (University of London), 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338284.
Der volle Inhalt der QuelleGhasemi, Farshid. „Multiplexed label-free integrated photonic biosensors“. Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53633.
Der volle Inhalt der QuelleAlghamdi, Owayed A. „Spectrum sensing and cooperation in cognitive-OFDM based wireless communications networks“. Thesis, University of Plymouth, 2012. http://hdl.handle.net/10026.1/1090.
Der volle Inhalt der QuelleTang, Xinyao. „Privacy-preserving Sensing and Wireless Communications for IoT-enabled Smart Environments“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1607713752973587.
Der volle Inhalt der QuelleSparrer, Susanne [Verfasser]. „Algorithms for (discrete) compressed sensing : a communications engineering perspective / Susanne Sparrer“. Ulm : Universität Ulm, 2020. http://d-nb.info/1216949271/34.
Der volle Inhalt der QuelleDI, NATALE ANTONIO. „Modeling and Experimentation of short range communications for sensing and IoT“. Doctoral thesis, Università degli Studi dell'Aquila, 2021. http://hdl.handle.net/11697/168385.
Der volle Inhalt der QuelleSmartt, Christopher James. „Fourier methods for the analysis of integrated optics devices“. Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294708.
Der volle Inhalt der QuelleJaved, Gaggatur Syed. „Integrated Interfaces for Sensing Applications“. Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2914.
Der volle Inhalt der QuelleJaved, Gaggatur Syed. „Integrated Interfaces for Sensing Applications“. Thesis, 2016. http://hdl.handle.net/2005/2914.
Der volle Inhalt der QuelleBastos, Ana Rita Naia. „Green photonics: photonic integrated circuits for optical communications and sensing based on organic-inorganic hybrids“. Doctoral thesis, 2018. http://hdl.handle.net/10773/25027.
Der volle Inhalt der QuelleO presente trabalho tem como objetivos a produção e caracterização de circuitos de ótica integrada (OI) eficientes e de baixo custo, no contexto dos requisitos de fotónica sustentável, nomeadamente na área das comunicações óticas e dos sensores. Para isso, híbridos orgânico-inorgânicos (di-ureiasil e tri-ureiasil), dopados com propóxido de zircónio estabilizado com ácido metracrílico, foram sintetizados pela metodologia sol-gel, à temperatura ambiente, como guias de onda planares processados na forma de monólitos, com forma e tamanho controlados, ou filmes de espessura variável (10−5-10−6 m), em substratos vítreos e de silício oxidado. Estes materiais exibem propriedades óticas estáveis e ajustáveis, estabilidade mecânica e térmica resultantes da sinergia entre os componentes orgânicos e inorgânicos. A sua principal propriedade é o fácil controlo das propriedades óticas devido à inerente flexibilidade dos materiais que são auto-padronizados pela escrita direta por radiação ultravioleta (UV), e o controlo do índice de refração por dopagem química. A influência de diferentes concentrações de aglomerados de zircónio (20-60 mol%) na estrutura local dos di-ureails e tri-ureasils foi analisada através de difração de raio-X, ressonância magnética nuclear dos átomos de 13C e 29Si, espectroscopia de infravermelho por transformada de Fourier, espectroscopia Raman por transformada de Fourier e análise termogravimétrica. As características óticas relevantes para aplicações em OI foram determinadas, revelando coeficientes de atenuação aceitáveis (∼1-5 dB·cm−1) para circuitos de baixas dimensões, e baixas perdas de inserção devido à similaridade entre os índices de refração do dispositivo-fibra (1,49-1,52). Tomando partido da fotossensibilidade do material, foi utilizada a escrita direta por radiação UV para padronizar a arquitetura ótica desejada na superfície de híbridos orgânico-inorgânicos. No que respeita às comunicações óticas, foram produzidos dispositivos passivos e ativos: controlador de polarização termo-ótico para monitorizar o estado de polarização de um sinal ótico, apresentando um coeficiente de retardamento linear de 17±1 °/°C; um acoplador híbrido de 90° para demodular uma transmissão de quadratura de chaveamento de fase com 20 Gb/s em 40 km de fibra, resultando numa penalidade de potência de 2,5 dB comparativamente à configuração sem fibra; um modulador de fase eletro-ótico baseado num interferómetro Mach-Zehnder (MZI) com uma diferença de potencial para uma variação de fase de π de 2,9±0,3 V; amplificador ótico na região espectral do azul para comunicações óticas no visível com uma eficiência máxima de ganho ótico de 1,62±0,02 cm∙μJ–1. Na área dos sensores, o desenvolvimento de biosensores portáteis de baixo custo baseados em OI para dispositivos é de grande interesse. Sendo assim, um biosensor baseado na arquitetura de um MZI foi produzido para monitorizar a concentração de bactérias num meio líquido, apresentando uma sensibilidade de 2×10−4 RIU e um limite de deteção de 2,0 pg·mm−3.
Programa Doutoral em Telecomunicações
Lin, Yu-Rou, und 林毓柔. „On-Interposer Data Communication for 2.5D Heterogeneously Integrated Bio-Sensing Microsystems“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/95703399464979168233.
Der volle Inhalt der Quelle國立交通大學
電子工程學系 電子研究所
102
2.5D integration allow to inter-chip communication between multiple chips with intra-chip interconnects. The interposer provides fast and low power chip-to-chip communication. In this thesis, an on-interposer bus (μ-SPI, serial peripheral interface) is presented for providing low power data communication in 2.5D heterogeneous integrations. The protocol of μ-SPI is designed by a hierarchical packetization technique based on the physical layer of SPI. The data width of μ-SPI is from 1-bit to 8-bit. To reduce the overhead of the header, the header of a packet is divided into two levels by the hierarchical packetization technique. The length of 1st level header is fixed for indicating the functionality of this packet. Based on the information of 1st level header, the 2nd level header is variable for providing wide range of the burst length, broadcasting selection and variable address. Moreover, a pseudo multi-master is proposed to replace the arbitration circuits via master passing. Only 1 master can exist by controlling MS_Flag in master/slave modules. The proposedμ-SPI is utilized in a 2.5D heterogeneously integrated bio-sensing microsystem. The average power of this on-interposer bus is only 23.2 µW at 1.8V and 100 KHz.