Tesis sobre el tema "All-optical routing and switching"
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Mokhtar, Ahmed. "Routing, switching, and multiaccess in all-optical networks /". Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/5942.
Texto completoYuan, Xiaochun y 袁小春. "Routing protocols in all-optical packet switched networks". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243885.
Texto completoYuan, Xiaochun. "Routing protocols in all-optical packet switched networks /". Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25100725.
Texto completoSantos, Blanco María Concepción. "Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices". Doctoral thesis, Universitat Politècnica de Catalunya, 1998. http://hdl.handle.net/10803/6913.
Texto completoUn medio no-lineal cuadrático tiene por fuerza que ser no-centrosimétrico, lo cual es una variedad de anisotropía. Una gran parte de los materiales no-lineales cuadráticos (los que tienen mayor interés para la industria) son uniaxiales lo que significa que presentan un eje de simetría que suele llamarse eje óptico. De la dirección de un haz relativa a ese eje óptico dependen las características de la propagación del haz en el medio cuadrático no-lineal. Una consecuencia de eso en configuraciones de interés es un desvío ('walk-off') sufrido por el haz respecto a su dirección de propagación inicial al entrar en el material no-lineal.
Las propiedades de los solitones cuadráticos 'caminantes' son también estudiadas en la tesis, estableciendo que existe una relación entre la potencia inyectada en el medio y el ángulo de desvío (walking angle).
Una parte importante de la tesis está dedicada al estudio a través de exhaustivos experimentos numéricos del potencial de estas ondas solitarias para constituir la base de dispositivos de conmutación y encaminamiento totalmente ópticos que puedan hacer realidad la promesa de la red transparente totalmente óptica. Los experimentos han permitido identificar varias configuraciones de interés con niveles de potencia y dimensiones que permiten plantearse el diseño y construcción de dispositivos comerciales de conmutación y encaminamiento totalmente ópticos basados en solitones ópticos cuadráticos.
This thesis is a comprehensive study of the fundamental properties of a specific kind of optical spatial solitary waves. First observed experimentally in 1995, these solitary waves are formed by an optical beam at a fundamental frequency and its second harmonic which propagate together and are mutually entangled; and are due to a balanced interplay between the beams' linear diffraction and a second-order nonlinear susceptibility of the medium. They are thereby referred as 'Optical Solitons in Quadratic Nonlinear Media' or simply 'Quadratic Solitons', They are also known as 'Multicolor Solitons' recalling that they are formed by beams at different frequencies.
A quadratic nonlinear media needs to be non centrosymmetric which is a special kind of anisotropy. A great deal of quadratic nonlinear materials (the most used by industry such as lithim niobate, KTP, etc.) are uniaxial meaning that they feature a symmetry axis known as 'optical axis'. The direction of propagation of an optical beam relative to that axis determines the characteristics of the beam's propagation through the quadratic nonlinear material. A main result of that in some configurations of interest is a walk-off suffered by the beam as it enters the quadratic material.
The properties of the families of quadratic solitons in the presence of a linear walk-off (quadratic walking solitons) are studied as well in the thesis stating that there is a relationship between the power injected into the medium and the walking angle, suitable to applications of all-optical switching and routing.
An important last part of the thesis is devoted to the study from a practical viewpoint and through extensive numerical experiments of the potential of these solitary waves as the basis of practical all-optical switches and routers which could take the all-optical transparent network to a reality. The experiments have allowed to identify several configurations of interest with power level and dimensions suited to practical applications which could allow the production of commercial all-optical switching and routing devices based on quadratic solitons.
Hawkins, William Cory. "Evaluation of the Data Vortex Photonic All-Optical Path Interconnection Network for Next-Generation Supercomputers". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14519.
Texto completoChiang, Ming Feng. "High speed all-optical packet switching router employing single and multiple PPM based routing tables". Thesis, Northumbria University, 2009. http://nrl.northumbria.ac.uk/2384/.
Texto completoHe, Jenny Jing. "Optical flow routing : a routing and switching paradigm for the core optical networks". Thesis, University of Essex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248654.
Texto completoGARRICH, ALABARCE MIQUEL. "Optical architectures for high performance switching and routing". Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2506247.
Texto completoHawkins, William Cory. "Evaluation of the data vortex photonic all-optical path interconnection network for next-generation supercomputers". Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-12182006-155304/.
Texto completoDr. Henry L. Owen III, Committee Member ; Dr. David Keezer, Committee Member ; Dr. D. Scott Wills, Committee Chair.
Sato, Ken-ichi. "Future directions in optical networking technology development — Optical fast circuit switching and multilevel optical routing". IEEE, 2009. http://hdl.handle.net/2237/13986.
Texto completoGao, Xingbo. "DESIGN AND ANALYSIS OF EFFECTIVE ROUTING AND CHANNEL SCHEDULING FOR WAVELENGTH DIVISION MULTIPLEXING OPTICAL NETWORKS". Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2810.
Texto completoPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science PhD
Yu, Wing Wa. "Routing and time-slot assignment in photonic circuit switching networks /". View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20YUW.
Texto completoIncludes bibliographical references (leaves 68-70). Also available in electronic version. Access restricted to campus users.
Chevalier, Franck. "Performance evaluation of the Clockwork routing scheme in optical packet switching networks". Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248602.
Texto completoSATO, Ken-ichi, Hiroshi HASEGAWA y Takahiro OGAWA. "Optical Fast Circuit Switching Networks Employing Dynamic Waveband Tunnel". 電子情報通信学会, 2012. https://search.ieice.org/.
Texto completoKomolafe, Olufemi O. "High-speed optical packet switching over arbitrary physical topologies using the Manhattan Street Network". Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366847.
Texto completoMasi, Marco. "Modeling of sequences of Silicon micro-Resonators for On-Chip Optical Routing and Switching". Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/369141.
Texto completoMasi, Marco. "Modeling of sequences of Silicon micro-Resonators for On-Chip Optical Routing and Switching". Doctoral thesis, University of Trento, 2011. http://eprints-phd.biblio.unitn.it/462/1/Tesi_finale.pdf.
Texto completoKlinkowski, Miroslaw. "Offset time-emulated architecture for optical burst switching-modelling and performance evaluation". Doctoral thesis, Universitat Politècnica de Catalunya, 2008. http://hdl.handle.net/10803/6000.
Texto completoAquesta tesi presenta l'anàlisi, modelització i avaluació de les xarxes de commutació de ràfegues òptiques basades en l'emulació del temps de compensació (emulated offset time: E-OBS). El concepte d'E-OBS defineix una arquitectura de xarxa OBS per al transportar i commutar ràfegues òptiques en una xarxa troncal en la que, al contrari de l'arquitectura convencional (C-OBS) en la que el temps de compensació s'introdueix des dels nodes d'accés, el temps de compensació s'introdueix en cadascun dels nodes de la xarxa per mitjà d'un retardador de fibra addicional. L'arquitectura E-OBS permet superar algunes de les desavantatges inherents a arquitectures C-OBS, però la seva gran virtut és la compatibilitat amb les xarxes de commutació de circuits òptics (OCS: Optical Circuit Switching) actuals i les futures xarxes de commutació de paquets òptics (OPS: Optical Packet Switching), de manera que les xarxes OBS basades en una arquitectura E-OBS) poden facilitat enormement la transició de unes a les altres.
A ala vista dels principals requeriments de disseny de les xarxes OBS, que són la resolució de contencions en el domini òptic, la provisió de qualitat de servei (QoS) i l'òptim encaminament de les ràfegues per tal de minimitzar la congestió de la xarxa, . en aquesta tesi es proposa un disseny de l'arquitectura E-OBS basada en (i) un mètode viable per a la provisió del temps de compensació, (ii) una qualitat alta global de servei, i (iii) un mecanisme d'encaminament que minimitzi congestió de xarxa.
- La primera part d'aquesta tesi proporciona la informació documental necessària per al disseny d'E-OBS.
- La segona part se centra en l'estudi de la funcionalitat i viabilitat de l'arquitectura E-OBS. S'introdueixen els principis d'operació d'E-OBS i s'identifiquen els principals esculls que presenten les arquitectures C-OBS i que deixen de ser-ho en una arquitectura E-OBS. Alguns d'aquests esculls són la dificultat d'utilitzar un algorisme d'encaminament amb rutes alternatives, la complexitat dels algoritmes de reserva de recursos i la seva falta d'equitat, la complexitat en la provisió de la QoS, etc. En aquesta segona part es constata que l'arquitectura E-OBS redueix la complexitat dels de reserva de recursos i es verifica la viabilitat d'operació i de funcionament de la provisió del tremps de compensació en aquesta arquitectura a partir de figures de comportament obtingudes amb retardadors de fibra comercialment disponibles.
- La tercera part encara el problema de la provisió de la QoS. Primer s'hi revisen els conceptes bàsics de QoS així com els mecanismes de tractament de la QoS per a xarxes OBS fent-ne una comparació qualitativa i de rendiment de tots ells. Com a resultat s'obté que el mecanisme que presenta un millor comportament és el d'avortament de la transmissió de les ràfegues de més baixa prioritat quan aquestes col·lisionen amb una de prioritat més alta (es l'anomenat Burst Preemption mechanism), el qual en alguns casos presenta un problema de senyalització innecessària. Aquesta tercera part es conclou amb la proposta d'un mecanisme de finestra a afegir al esquema de Burst Preemption que només funciona sobre una arquitectura E-OBS i que soluciona aquest problema.
- En la quarta part s'afronta el problema de l'encaminament en xarxes OBS. S'estudia el comportament dels algoritmes d'encaminament adaptatius, els aïllats amb rutes alternatives i els multicamí distribuïts, sobre xarxes E-OBS. A la vista dels resultats no massa satisfactoris que s'obtenen, es planteja una solució alternativa que es basa en model d'optimització no lineal. Es formulen i resolen dos models d'optimització per als algoritmes encaminament de font multicamí que redueixen notablement la congestió en les xarxes OBS.
Finalment, aquesta tesi conclou que l'arquitectura E-OBS és factible, que és més eficient que la C-OBS, que proveeix eficaçment QoS, i que és capaç d'operar amb diverses estratègies d'encaminament i de reduir eficaçment la congestió de xarxa.
The fact that the Internet is a packet-based connection-less network is the main driver to develop a data-centric transport network. In this context, the optical burst switching (OBS) technology is considered as a promising solution for reducing the gap between transmission and switching speeds in future networks.
This thesis presents the analysis, modelling, and evaluation of the OBS network with Emulated offset-time provisioning (E-OBS). E-OBS defines an OBS network architecture to transport and switch optical data bursts in a core network. On the contrary to a conventional offset-time provisioning OBS (C-OBS) architecture, where a transmission offset time is introduced in the edge node, in an E-OBS network the offset time is provided in the core node by means of an additional fibre delay element. The architecture is motivated by several drawbacks inherent to C-OBS architectures. It should be pointed out that the E-OBS has not been studied intensively in the literature and this concept has been considered rather occasionally.
Due to the limitations in optical processing and queuing, OBS networks need a special treatment so that they could solve problems typical of data-centric networks. Contention resolution in optical domain together with quality of service (QoS) provisioning for quality demanding services are, among other things, the main designing issues when developing OBS networks. Another important aspect is routing problem, which concerns effective balancing of traffic load so that to reduce burst congestion at overloaded links. Accounting for these requirements, the design objectives for the E-OBS architecture are (i) feasibility of offset-time provisioning, (ii) an overall high quality of service, and (iii) reduction of network congestion. These objectives are achieved by combining selected concepts and strategies, together with appropriate system design as well as network traffic engineering.
The contributions in this thesis can be summarized as follows.
- At the beginning, we introduce the principles of E-OBS operation and we demonstrate that C-OBS possesses many drawbacks that can be easily avoided in E-OBS. Some of the discussed issues are the problem of unfairness in resources reservation, difficulty with alternative routing, complexity of resources reservation algorithms, efficiency of burst scheduling, and complexity in QoS provisioning. The feasibility of E-OBS operation is investigated as well; in this context, the impact of congestion in control plane on OBS operation is studied. As a result, we confirm the feasibility of E-OBS operation with commercially available fibre delay elements.
- Then, we provide both qualitative and quantitative comparison of the selected, most addressed in the literature, QoS mechanisms. As an outcome a burst preemption mechanism, which is characterized by the highest overall performance, is qualified for operating in E-OBS. Since the preemptive mechanism may produce the overbooking of resources in an OBS network we address this issue as well. We propose the preemption window mechanism to solve the problem. An analytical model of the mechanism legitimates correctness of our solution.
- Finally, we concern with a routing problem - our routing objective is to help the contention resolution algorithms in the reduction of burst losses. We propose and evaluate two isolated alternative routing algorithms designed for labelled E-OBS networks. Then we study multi-path source routing and we use network optimization theory to improve it. The presented formulae for partial derivatives, to be used in a non-linear optimization problem, are straightforward and very fast to compute. It makes the proposed non-linear optimization method a viable alternative for linear programming formulations based on piecewise linear approximations.
Concluding, E-OBS is shown to be a feasible OBS network architecture of profitable functionality, to support efficiently the QoS provisioning, and to be able to operate with different routing strategies and effectively reduce the network congestion.
Guan, Kyle Chi. "Cost-effective optical network architecture : a joint optimization of topology, switching, routing and wavelength assignment". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38678.
Texto completoIncludes bibliographical references (p. 279-285).
To provide end users with economic access to high bandwidth, the architecture of the next generation metropolitan area networks (MANs) needs to be judiciously designed from the cost perspective. In addition to a low initial capital investment, the ultimate goal is to design networks that exhibit excellent scalability - a decreasing cost-per-node-per-unit-traffic as user number and transaction size increase. As an effort to achieve this goal, in this thesis we search for the scalable network architectures over the solution space that embodies the key aspects of optical networks: fiber connection topology, switching architecture selection and resource dimensioning, routing and wavelength assignment (RWA). Due to the inter-related nature of these design elements, we intended to solve the design problem jointly in the optimization process in order to achieve over-all good performance. To evaluate how the cost drives architectural tradeoffs, an analytical approach is taken in most parts of the thesis by first focusing on networks with symmetric and well defined structures (i.e., regular networks) and symmetric traffic patterns (i.e., all-to-all uniform traffic), which are fair representations that give us suggestions of trends, etc.
(cont.) We starts with a examination of various measures of regular topologies. The average minimum hop distance plays a crucial role in evaluating the efficiency of network architecture. From the perspective of designing optical networks, the amount of switching resources used at nodes is proportional to the average minimum hop distance. Thus a smaller average minimum hop distance translates into a lower fraction of pass-through traffic and less switching resources required. Next, a first-order cost model is set up and an optimization problem is formulated for the purpose of characterizing the tradeoffs between fiber and switching resources. Via convex optimization techniques, the joint optimization problem is solved analytically for (static) uniform traffic and symmetric networks. Two classes of regular graphs - Generalized Moore Graphs and A-nearest Neighbors Graphs - are identified to yield lower and upper cost bounds, respectively. The investigation of the cost scalability further demonstrates the advantage of the Generalized Moore Graphs as benchmark topologies: with linear switching cost structure, the minimal normalized cost per unit traffic decreases with increasing network size for the Generalized Moore Graphs and their relatives.
(cont.) In comparison, for less efficient fiber topologies (e.g., A-nearest Neighbors) and switching cost structures (e.g., quadratic cost), the minimal normalized cost per unit traffic plateaus or even increases with increasing network size. The study also reveals other attractive properties of Generalized Moore Graphs in conjunction with minimum hop routing - the aggregate network load is evenly distributed over each fiber. Thus, Generalized Moore Graphs also require the minimum number of wavelengths to support a given uniform traffic demand. Further more, the theoretical works on the Generalized Moore Graphs and their close relatives are extended to study more realistic design scenarios in two aspects. One aspect addresses the irregular topologies and (static) non-uniform traffic, for which the results of Generalized Moore networks are used to provide useful estimates of network cost, and are thus offering good references for cost-efficient optical networks. The other aspect deals with network design under random demands. Two optimization formulations that incorporate the traffic variability are presented.
(cont.) The results show that as physical architecture, Generalized Moore Graphs are most robust (in cost) to the demand uncertainties. Analytical results also provided design guidelines on how optimum dimensioning, network connectivity, and network costs vary as functions of risk aversion, service level requirements, and probability distributions of demands.
by Kyle Chi Guan.
Ph.D.
Toku, Hadi Alper. "A New Feedback-based Contention Avoidance Algorithm For Optical Burst Switching Networks". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610165/index.pdf.
Texto completocontention avoidance can be achieved efficiently. The performance analysis of the proposed algorithm is presented through network simulation results provided by OMNET++ simulation environment. The simulation results show that the proposed contention avoidance technique significantly reduces the burst loss probability as compared to networks without any contention avoidance techniques.
Mendoça, Pedroso Pedro Miguel. "GMPLS-OBS interoperability and routing acalability in internet". Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/52565.
Texto completoChen, Jiajia. "Design, analysis and simultion for optical access and wide-area networks". Doctoral thesis, KTH, Mikroelektronik och tillämpad fysik, MAP, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10348.
Texto completoQC 20100707
Sato, Ken-ichi y Hiroshi Hasegawa. "Optical Networking Technologies That Will Create Future Bandwidth-Abundant Networks [Invited]". IEEE, 2009. http://hdl.handle.net/2237/13919.
Texto completoNascimento, Luiz Henrique Bonani do 1977. "Proposta de arquitetura inovadora para redes de pacotes opticos baseadas em chaveamento fotonico". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260716.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-07T06:09:06Z (GMT). No. of bitstreams: 1 Nascimento_LuizHenriqueBonanido_D.pdf: 2297657 bytes, checksum: b04918af9ef98f4cae4bd6c3d6d4c0ca (MD5) Previous issue date: 2006
Resumo: Hoje em dia, como uma multiplicidade muito grande de tecnologias converge para as redes fotônicas, a demanda por vazão cresce. Os protocolos para acesso múltiplo e simultâneo às portas de entrada da rede, bem como a abordagem do formato dos pacotes fotônicos e a arquitetura das redes, são considerados como alternativas tecnológicas para a melhora do desempenho das redes fotônicas. Deste modo, apresenta-se aqui uma proposta para a arquitetura de redes fotônicas,utilizando topologias em malha otimizadas para que os pacotes atinjam seus respectivos nós de destino no menor número de hops possível, com nós de rede 2x2. Além disso, utiliza-se o roteamento por deflexão para a resolução de contenda entre pacotes ópticos, bem como buffers eletrônicos na entrada da rede óptica para evitar problemas de perdas de inserção. Além disso, a estrutura de rede permite hierarquização e também se propõe um modelo para o funcionamento do nó que faz a ligação entre hierarquias diferentes dentro da rede óptica. Esta arquitetura de rede é então avaliada quanto à sua capacidade de prover requisitos para QoS em termos de perdas de pacotes, atrasos e inversão de ordem de pacotes, para a qual é proposta uma heurística para uma avaliação quantitativa. Os resultados mostram que uma arquitetura nos moldes apresentados é capaz de prover ganhos de desempenho, oferecendo condições para a garantia de QoS, provida por protocolos de rede em nível superior, até cerca de 70% de carga
Abstract: Nowadays, as a multiplicity of technologies converges upon the optical network, the demand for throughput increases. The protocols for multiple and simultaneous access to network ports, as well as the optical packet approach should be considered as technological alternatives to optical network performance upgrade. Thus, we present here a new proposal to the architecture of optical packet networks, using mesh topologies optimized in such a way that the packets reach their respective destination nodes with the smaller possible number of hops, and using 2x2 network nodes. Besides, we use deflection routing to solve the contention between optical packets, as well as electronical buffers at the optical network input to prevent problems with insertion losses. The structure of the network also allows hierarchization, performing the link between different hierarchies on the optical network. The performance of the proposed architecture is evaluated by the capacity of providing requirements of QoS, in terms of packet losses, delays and the amount of out of order packets, for which is presented a heuristic to get a quantitative estimation. The results show that the proposed architecture is able to provide performance gains, giving conditions to guarantee some levels of QoS, which is done by the specific protocols of superior network layers, up to 70% of network load
Doutorado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica
Vikrant, Nikam. "Design and Performance Evaluation of Resource Allocation Mechanisms in Optical Data Center Networks". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198163.
Texto completoEtt datacenter inrymmer hundratusentals servrar och en stor mängd bandbredd krävs för att skicka data mellan tusentals servrar. Flera datacenter baserade på paketförmedlande arkitekturer föreslås för att tillgodose kravet på hög bandbredd med hjälp av flerskiktsnätverkstopologier, men på bekostnad av ökad komplexitet i nätverken och hög energiförbrukning. Under de senaste åren har fokus skiftat från paketförmedling till optisk kretsomkoppling for att bygga datacenternätverk som kan stödja på-begäran-anslutningar och höga bithastigheter med låg strömförbrukning. Å andra sidan, med tillkomsten av Software Defined Networking (SDN) och nätverksfunktionen Virtualisering (NFV), har betydelsen av datacenter blivit mer avgörande. Det har ökat behovet av dynamik och flexibilitet inom ett datacenter, vilket leder till storre komplexitet i datacenternätverken. Med NFV kan tjänstekedjor åstadkommas i ett datacenter, där virtualiserade nätverksfunktioner (VNFs) som körs på servrar i ett datacenter kan instansieras och avslutas dynamiskt. Ett datacenter måste också tillgodose kravet på stor kapacitet eftersom tjänstekedjan innebär styrning av stora aggregerade flöden. Användningen av optisk kretsomkoppling i datacenternätverk ser ganska lovande ut for att uppfylla sådana trafikkrav dynamik och hög kapacitet. I detta examensarbete, har en ny och modulär optisk datacenternätverksarkitektur (DCN) som använder flerriktningvåglängdsswitchar (MD-WSS) införs. Ett användningsfall av VNF-tjänstekedjor noga övervägd för utvärdering av denna DCN och end-to-end-servicekedjans problem formuleras som tre sammankopplade delproblem: multiplexering av VNF-servicekedjor, VNF placering i datacentret och routing och våglängd uppdrag. Denna avhandling presenterar heltalsprogrammering (ILP) formulering och heuristik för att lösa dessa problem och numeriskt utvärdera dem.
Sathyan, Saju. "All Optical Switching Architectures". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-253.
Texto completoIn communication systems, the need for high bandwidth interconnects and
efficient distribution of large amount of data is very essential. This thesis work
addresses all-optical packet switching issues in the field of reconfigurable optical
interconnection networks for high performance embedded systems. The recent
research conducted at the Halmstad University, on high performance embedded
systems, focuses on the optical interconnection techniques to achieve ultra high
throughputs and reconfigurability at the system level.
Recent research in the field of optical interconnection networks for applications
like switches and routers for data and telecommunication industry and parallel
computing architectures for embedded signal processing use optical to electrical
conversion to switch packets. This conversion scales down the enormous bandwidth
capacity of the optical communication channels to electronic processing rates. To
maintain the high throughputs all over the interconnection networks, the optical
packets need to be maintained in optical state and switched to different part of the
interconnection network. To achieve this goal, all-optical packet switching
architectures are studied. The study is concluded with a positive outlook towards alloptical
switching technologies, and it will play a very important role in the near
future in the field of optical communication, telecommunication and embedded
systems.
Reis, Cláudia Sofia Marcos Machado. "All-optical routing functionalities". Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12865.
Texto completoAll-optical solutions for switching and routing packet-based traffic are crucial for realizing a truly transparent network. To meet the increasing requirements for higher bandwidth, such optical packet switched networks may require the implementation of digital functions in the physical layer. This scenario stimulated us to research and develop innovative high-speed all-optical storage memories, focusing mainly on bistables whose state switching is triggered by a pulsed clock signal. In clocked devices, a synchronization signal is responsible for controlling the enabling of the bistable. This thesis also presents novel solutions to implement optical logic gates, which are basic building blocks of any processing system and a fundamental element for the development of complex processing functionalities. Most of the proposed schemes developed in this work are based on SOA-MZI structures due to their inherent characteristics such as, high extinction ratio, high operation speed, high integration capability and compactness. We addressed the experimental implementation of an all-optical packet routing scheme, with contention resolution capability, using interconnected SOAMZIs. The impact on the system performance of the reminiscent power of the blocked packets, from the non ideal switching performed by the SOA-MZIs, was also assessed.
As soluções totalmente óticas para a comutação e encaminhamento de pacotes de tráfego são cruciais para a realização de uma rede verdadeiramente transparente. Para atender às exigências crescentes de maior largura de banda, tais redes de comutação de pacotes óticos exigem a implementação de funções digitais na camada física. Este cenário estimulou-nos a investigar e a desenvolver memórias totalmente óticas, focando-nos principalmente na implementação de flip-flops óticos síncronos, cujo estado de comutação é accionado por um sinal de relógio. Esta tese também apresenta novas soluções para implementar portas lógicas óticas, visto estas serem um elemento fundamental para o desenvolvimento de funcionalidades complexas de processamento. A maioria dos esquemas propostos neste trabalho são baseados em estruturas interferométricas activas Mach-Zehnder (SOA-MZI) devido às suas características intrínsecas, nomeadamente, razão de extinção elevada bem como elevada capacidade de integração. A implementação experimental de um sistema de encaminhamento de pacotes totalmente ótico foi realizada usando cascatas de SOA-MZIs. O impacto da potência residual, devido à comutação não ideal dos SOA-MZIs, foi também analisado.
Le, Dinh Danh. "All-Optical Multicast Routing under Optical Constraints". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS214/document.
Texto completoOver the past decade, network traffic levels experienced an explosive growth at about double amount in approximately every thirty months. The sources accounting for this growth come from numerous high-speed applications (e.g., video-on-demand, high-definition television) which involve the data transmission in multicast groups. To realize optical multicasting, optical routers should have light splitters to split light signals and wavelength converters to change the wavelengths wherever needed. However, the splitting reduces the energy of the output signal which in turn requires the costly power amplification or regeneration. Wavelength converters are also immature to be deployed widely in current optical technologies. Consequently, in all-optical networks, routers are often heterogeneous in their processing units, which challenges the routing. Therefore, it is crucial to design efficient multicast routing strategies at the backbone optical networks, in order to achieve cost-performance tradeoff solutions while satisfying the ever-increasing bandwidth demands and optical constraints.In this thesis, we investigate the all-optical multicast routing (AOMR) problems in heterogeneous optical networks. The heterogeneity mainly comes from the absence/presence of light splitters and wavelength converters and the uneven distribution of wavelengths in the network links. In general, AOMR problems are often NP-hard. The objective of the thesis is to analyze and formulate the problems, to search for the optimal solutions, and to propose efficient heuristics to solve the problems under different optical constraints. Both possible contexts, i.e., single-multicast request and multiple-multicast requests, are examined. All the reported results in the thesis are supported by extensive and careful simulations. The major contributions can be summarized as follows.1) We identify the optimal route structures for AOMR problems under heterogeneous mesh WDM networks. As shown in the thesis, the optimal solutions are no longer based on conventional light-trees, but a more general tree-like structure called hierarchy. Some forms of hierarchy realized for WDM multicasting are light-trails, light-hierarchies, light-spider hierarchies and a set of these light-structures. The exact and heuristic algorithms proposed in the thesis are mainly based on hierarchy. 2) For single-multicast with sparse-splitting case, we propose an efficient heuristic algorithm to produce a good tradeoff solution among wavelength consumption, channel total cost and end-to-end delay.3) For single-multicast with non-splitting case, we prove the NP-hardness, identify the optimal solution as a set of light-spider hierarchies, formulate the problems by means of Integer Linear Program (ILP) formulations to find the exact solution, and propose several cost-effective heuristic algorithms to compute the approximate solutions. 4) For the case with multiple-multicast requests, we focus on static traffic patterns under sparse-splitting without wavelength conversion case. First, an ILP formulation based on light-hierarchies is proposed to search for the optimal solution. By applying the layered graph model, we then develop several adaptive heuristic algorithms to compute light-hierarchies for approximate solutions. These adaptive algorithms outperform the existing fixed routing ones in minimizing the blocking probability. Overall, the thesis points out that the optimal solutions for heterogeneously constrained AOMR problems correspond to hierarchies, regardless of request multiplicity consideration
Barry, Richard A. "Wavelength routing for all-optical networks". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12508.
Texto completoIncludes bibliographical references (p. 171-176).
by Richard A. Barry.
Ph.D.
Chai, Yue. "Nonlinear propagation of unconventional beams in a photorefractive crystal". Electronic Thesis or Diss., CentraleSupélec, 2024. http://www.theses.fr/2024CSUP0005.
Texto completoThe thesis focuses on the propagation of Bessel beams in a photorefractive crystal, involving technologies used in advanced optical communications, such as the all-optical router, switcher, mode multiplexing and demultiplexing using orbital angular momentum (OAM). The work is in two parts: the photo-inscription of waveguides and the modulation of OAM modes. In the first part, we demonstrate numerically and experimentally that a single diffracting Bessel beam can induce complex waveguides under the PR effect. In addition, by manipulating the parameters of our optical platform, we achieve flexible control of the induced waveguides’ characteristics. By testing these photo-induced waveguides using Gaussian probe beams, we confirm their complex routing functions. Furthermore, by introducing the second counter-propagating beam, we induce dynamic waveguides and demonstrate the control in any regime. In the second part, we demonstrated in simulations and experiments that the OAM of an arbitrarily polarized Bessel beam can be continuously modulated in the PR crystal by the applied electric field. By discussing parameter, we confirm optimal parameters to obtain the broadest modulation range in the steady state. We propose temporal plateaux long enough on which the OAM exceeds its initial value, thus enabling the extension of the OAM modulation range, even in the unstable regime. All the results in this thesis open up promising prospects for developing new technologies in all-optical or quantum communications
Pegg, Steven Ian. "All-optical switching in semiconductor laser devices". Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324237.
Texto completoMatres, Abril Joaquín. "Ultrafast, CMOS compatible, integrated all optical switching". Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/37984.
Texto completoMatres Abril, J. (2014). Ultrafast, CMOS compatible, integrated all optical switching [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/37984
TESIS
Almeida, Paulo Jorge dos Santos. "Novel all-optical switching and processing techniques for optical networking". Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/46857/.
Texto completoBorrero-Molina, Armando. "Simulation of all-optical networks with deflection routing". Versailles-St Quentin en Yvelines, 2004. http://www.theses.fr/2004VERS0021.
Texto completoIn this work, we hâve developed an aU-optical networks simulator, that uses a deflection routing method. The chosen topology for our rnodel is a 2D grid network, mainly because of its simplicity of implementation and its approach to a real topology. The size of thé modèle network is 10x10. We hâve considered this size, taking in considération that our network is of thé type "Core Network". We hâve proved a distributed algorithm that deflects thé smaltest number of customers in every node of thé net. We hâve called it Minime Deflection Algorithm and we hâve evaluated its performances in an all-optical network. Every node attempts to send thé packets to theirs optimal routes, to thé shortest hop path to their destination, thé path with thé minimum number of deflections. We hâve also developed another deflection routing algorithm that does a gtobal minimization on thé packets route, and we hâve called it, Scate Routing Algorithm. We hâve paralleled our simulator and we hâve imptemented a distributed simulator in order to obtain better exécution times, with thé intention of decrease thé exécution time and to run bigger problems, this is, to exécute thé simulator with bigger values of thé arrivai rate or bigger simulation times, bigger number of hops. We hâve also developed some Network Access Controls, in order to central thé input networks flow, to central thé load to offer diverse types of Quality of Service and to improve thé time transport performances
Robinson, Bryan S. (Bryan Shawn) 1975. "Semiconductor-based all-optical switching for optical time-division multiplexed networks". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17590.
Texto completoIncludes bibliographical references.
All-optical switching will likely be required for future optical networks operating at data rates which exceed electronic processing speeds. Switches utilizing nonlinearities in semiconductor optical amplifiers (SOA) are particularly attractive due to their compact size, low required switching energies, and high potential for integration. In this dissertation we investigate the practical application of such semiconductor-based all-optical switches in next-generation optical networks. We present both theoretical and experimental studies of SOA-based interferometric switches. A detailed numerical model for the dynamic response of an SOA to an intensity-modulated optical signal is described. The model is validated using novel pump-probe techniques to measure the time-domain response of an SOA subject to various levels of saturation. The model is then used to evaluate the performance of three common SOA-based interferometric all-optical switches. The use of SOAs in optical transmission systems has been limited due to the deleterious effects of pattern-dependent gain saturation. We develop a statistical model to study the system impact of variations of the SOA optical gain in response to a random intensity-modulated optical signal. We propose the use of pulse-position modulation (PPM) as a means for mitigating gain saturation effects in SOA-based optical processors. We present techniques for modulation and detection of optical PPM signals at data rates in excess of 100 Gbit/s. We demonstrate demultiplexing, wavelength conversion, and format conversion of optical PPM signals at data rates as high as 80 Gbit/s. Finally, we report on experimental demonstrations of an optical interface for slotted OTDM networks.
(cont.) We implement head-end and transmitter nodes capable of producing fully loaded optical slots at an aggregate network data rate of 112.5 Gbit/s. We demonstrate a fully functional receiver node which utilizes semiconductor-based all-optical logic for synchronization, address processing, and rate conversion.
by Bryan S. Robinson.
Ph.D.
Jaques, Stuart Roland. "A TLM analysis of an all-optical switching device". Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363266.
Texto completoEvans, Ivan. "Nonlinearities and all-optical switching in semiconductor laser amplifiers". Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325471.
Texto completoRobinson, Bryan S. (Bryan Shawn) 1975. "All-optical switching using semiconductor amplifiers biased at transparency". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/28194.
Texto completoIncludes bibliographical references (leaves 99-106).
by Bryan S. Robinson.
M.Eng.
Cheney, Glenn P. (Glenn Peter) Carleton University Dissertation Engineering Electrical. "All-optical gain switching of erbium-doped fibre amplifiers". Ottawa, 1992.
Buscar texto completoIkeda, Kazuhiro. "All-optical nonlinear switching in optical micro-resonators on a silicon chip". 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?p3335615.
Texto completoTitle from first page of PDF file (viewed December 11, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 98-104).
Bickel, Nathan. "ELECTRO-OPTICAL AND ALL-OPTICAL SWITCHING IN MULTIMODE INTERFERENCE WAVEGUIDES INCORPORATING SEMICONDUCTOR NANOSTRUCTURES". Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2977.
Texto completoPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Born, Brandon. "Photonic architectures for ultrafast all-optical switching and retro-modulation". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63851.
Texto completoApplied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
Loka, Hany. "Ultrafast all-optical switching using low-temperature-grown gallium arsenide". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq41462.pdf.
Texto completoLambert, Charles-Henri. "All-Optical Helicity dependent switching effect in magnetic thin films". Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0091/document.
Texto completoThe possibilities of modifying magnetization without applied magnetic fields have attracted growing attention over the past fifteen years. The low-power manipulation of magnetization, preferably at ultrashort timescales, has become a fundamental challenge with implications for future magnetic information memory and storage technologies. In particular the interplay of laser and magnetism recently discovered by Stanciu et al. opens up new way for light to be used as an excitation and a probe of magnetic materials. A description of the current models and frameworks developed in the field requires a careful look at the different parameters involved through the interaction of ultrafast lasers and magnetic materials. The specific and complex interplay between heat and angular momentum transfer is highlighted in order to discuss the role of each of them in the phenomena observed. The timescales of the different interactions responsible for the final state of magnetization are presented and will impact the way the system recovery after a laser excitation. Besides we were interested in exploring the relation between the material parameters such as anisotropy, ordering temperature and exchange coupling on the final state of magnetization obtained with a laser. Indeed thanks to the many different magnetism classes existing the magnetic parameters can be tuned widely and in a controlled manner. Our imaging setup then is able to probe the optical characteristics and domain stability after the laser excitation. We finally demonstrated that all-optical helicity-dependent switching (AO-HDS) can be observed not only in selected rare earth-transition metal (RE-TM) alloy films but also in a much broader variety of materials, including RE-TM alloys, multilayers and heterostructures. We further show that RE-free Co-Ir-based synthetic ferrimagnetic heterostructures designed to mimic the magnetic properties of RE-TM alloys also exhibit AO-HDS. We further developed the optical control of ferromagnetic materials ranging from magnetic thin films to multilayers and even granular films being explored for ultra-high-density magnetic recording. Our finding shows that optical control of magnetic materials is a much more general phenomenon than previously assumed and may have a major impact on data memory and storage industries through the integration of optical control of ferromagnetic bits
Hadri, Mohammed Salah El. "Magnetization reversal mechanism leading to all-optical helicity-dependent switching". Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0107/document.
Texto completoThe control of magnetization without external magnetic fields is an emergent field of research due to the prospect of impacting many technological applications such as magnetic recording and spintronics. In 2007, Stanciu et al. discovered an intriguing new possibility to switch magnetization in a ferrimagnetic GdFeCo alloy film using femtosecond laser pulses. This all-optical switching of magnetization had long been restricted to GdFeCo alloys, though it turned out to be a more general phenomenon for a variety of ferromagnetic and ferromagnetic materials. This discovery paved the way for an integration of the all-optical writing in storage industries. Nevertheless, the theoretical models explaining the switching in GdFeCo alloys films do not appear to apply in the other materials, thus questioning the uniqueness of the microscopic origin of all-optical switching. In this thesis, we have investigated the response of femtosecond laser pulses in ferrimagnetic alloys and ferromagnetic multilayers to the action of femtosecond laser pulses, in order to elucidate several aspects of the all-optical switching mechanism. We have experimentally studied the magnetic parameters governing the all-optical switching. We showed that the observation of all-optical switching requires magnetic domains larger than the laser spot size during the cooling process; such a criterion is common for both ferrimagnets and ferromagnets. Furthermore, we have investigated the integration of all-optical switching in spintronic devices via the anomalous Hall effect. Through a time-dependent electrical investigation of the magnetization in Hall crosses, we distinguished between two types of all-optical switching mechanisms. The first type is the single-pulse helicity-independent switching in ferrimagnetic GdFeCo alloy films as shown in previous studies, whereas the second is a two regimes helicity-dependent switching in both ferrimagnetic TbCo alloys and ferromagnetic Co/Pt multilayers. The latter consists in a step-like helicity-independent multiple-domain formation followed by a helicity-dependent remagnetization on several tens of milliseconds
Day, Ian Edward. "All-optical nonlinearities in semiconductor multi-quantum well waveguides for optical switching at 1.55μm". Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760675.
Texto completoKim, Dug Young. "Interferometric measurements of nonlinear optical properties for all optical switching applications in dielectric waveguides". Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186968.
Texto completoPatel, Naimish S. (Naimish Sanjay). "High speed all-optical switching based on a single-arm interferometer". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38806.
Texto completoIncludes bibliographical references (leaves 125-133).
by Naimish S. Patel.
M.Eng.
Yang, Michael C. H. "SUBPECOSECOND ALL OPTICAL SWITCHING IN A POLYMERIC ONE-DIMENSIONAL PHOTONIC CRYSTAL". University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1154013496.
Texto completoDeLong, Kenneth Wayne. "Two-photon absorption and color centers: Effects on all-optical switching". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185023.
Texto completo