Dissertations / Theses on the topic 'Réseau de télécommunications optiques'
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Dupont, Hervé. "Etude de la transposition de longueur d'onde appliquée au routage dans un réseau optique multicolore." Brest, 1995. http://www.theses.fr/1995BRES2011.
Full textNarlis, Ethon Odysseus. "Contribution à l'étude d'un réseau local à fibre optique à standard réparti." Toulouse, INPT, 1988. http://www.theses.fr/1988INPT046H.
Full textLagrost, Alexandra. "Génération de peignes de longueurs d'ondes à haut débit pour les télécommunications optiques." Phd thesis, Université Rennes 1, 2010. http://tel.archives-ouvertes.fr/tel-00656651.
Full textJarry, Aubin. "Connexité dans les réseaux de télécommunications." Phd thesis, Université de Nice Sophia-Antipolis, 2005. http://tel.archives-ouvertes.fr/tel-00263555.
Full textNaciri, Youssef. "Synchronisation de paquets optiques dans les réseaux de télécommunications : réalisation d'un module exploitant l'interaction acousto-optique." Brest, 2000. http://www.theses.fr/2000BRES2050.
Full textAmaya, Mohammad. "Amélioration des performances d'un amplificateur optique à semi-conducteurs par injection optique à la transparence du gain pour les réseaux de télécommunications optiques." Brest, 2006. http://www.theses.fr/2006BRES2025.
Full textSemiconductor optical amplifier (SOA) is an attractive component for future metropolitan multicolor all-optical telecommunication networks. This work focuses on the theoretical and experimental study of the SOA static and dynamic performances, when injecting a continuous wave (CW) high power as a holding beam (HB) at the gain transparency wavelength into its cavity with the aim of pointing out the interesting effects of this technique. Our work has shown that employing the holding beam, improves the soa saturation output power, the carrier lifetime and the device gain recovery time, over a wideband of incident signal wavelengths and powers without sacrificing the amplifier gain level neither degrading its noise figure (NF). Our theoretical and experimental results point out that injecting the holding beam in counter-propagative configuration with respect to the optical incident signal is more efficient than that in co-propagative one. We have employed the holding beam injection in an SOA based WDM multichannel transmission system with the purpose of reducing the cross-gain modulation (XGM) induced inter-channel crosstalk, hence, of improving the signals bit error rate (BER). Finally, a simulation model which gives results close to the measured ones has been obtained during this work as well
Pain, Franck. "Etude, conception et réalisation de systèmes d'aiguillage spatial par rotation de polarisation pour le brassage optique - applications au réseau de télécommunication." Brest, 1998. http://www.theses.fr/1998BRES2020.
Full textLiu, Hexin. "Radio sur fibre : réseaux, couvertures radio, architectures et dimensionnements matériels." Télécom Bretagne, 2013. http://www.telecom-bretagne.eu/publications/publication.php?idpublication=13211.
Full textIn this thesis, we have studied a Radio-over-Fibre Distributed Antenna System for WLAN IEEE802. 11g OFDM at 2. 45 GHz. By analyzing the model and the characteristics of the optical link, we have studied the limitations of such system, and then proposed the technical solution. Because of the high noise figure and the low compression point of the optical link, the dynamic range of a Point to Point Radio-over-Fibre system could be very small, which does limit the performance of receiver (Access Point). Considering the received sensitivities defined by IEEE802. 11g OFDM, the uplink could only respect the specification with the automatic gain control (AGC) loops. With simulation and measurement, we have proved that, using the automatic gain control units, the uplink performance of the access point can be improved. Then, we have analyzed the performance of the system including several distributed antennas. The uplink performance is still limited. For several architectures, we have studied the link budget and system dimensioning with different number of antennas. The diversity reception seemed necessary
Indre, Raluca Maria. "Analyse de performance des réseaux optiques à commutation en sous-longueur d'onde." Phd thesis, Télécom ParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00838427.
Full textLecoche, Frédéric. "Modélisation et simulation de noeuds de routage optique dans les réseaux dorsaux hybrides." Télécom Bretagne, 2008. http://www.theses.fr/2008TELB0064.
Full textRecently, consumers' and organizations' appetence in terms of numerical data usage has led to the rapid development of optical transport networks. The services offered to users are requiring more and more in terms of bandwidth. The introduction of optical transparency within the networks makes for more flexible networks and higher bit rates. The hybrid optical cross-connects (OXC) thanks to their all optical switching afford transparency and allow the electrical regeneration (through dedicated ports)of canals whose quality is believed to be insufficient from the physical parameters of transmission. In this study, two OXC architectures were chosen, one based on an optical switching matrix and the other based on Wavelength Selective Switch (WSS). This research study highlights the modelling and simulation of these two architectures using an optical transmission simulator (VPI TM). The first part of this study presents the general approach to the modelling and the simulation of a device and of optical equipment. The switching devices are modelised taking into consideration the transmission parameters used for the estimation of a canal's quality. After functional validation of the spatial switching and of their elementary static characteristics as well as systems test, the switching models are implemented in OXC working on WDM (50 and 100 GHz) spectra
Payoux, Franck. "Étude des réseaux d'accès optiques exploitant le multiplexage en longueur d'onde." Télécom Bretagne, 2006. http://www.theses.fr/2006TELB0016.
Full textBoulet, Bénédicte. "Etude du multiplexage temporel et en longueur d'onde dans les réseaux optiques." Brest, 1997. http://www.theses.fr/1997BRES2012.
Full textLalande, Jean-François. "Conception de réseaux de télécommunications : optimisation et expérimentations." Phd thesis, Université de Nice Sophia-Antipolis, 2004. http://tel.archives-ouvertes.fr/tel-00008012.
Full textLa première partie débute par la présentation des réseaux optiques WDM. Nous abordons ensuite les modèles pour les réseaux optiques et satellitaires et proposons des méthodes algorithmiques nouvelles pour optimiser l'allocation des ressources de ces réseaux. Nous traitons ainsi le problème du routage, du groupage et de la protection des réseaux WDM successivement dans trois chapitres puis nous nous intéressons à un algorithme dédié à l'allocation de fréquences dans les réseaux satellitaires. Enfin, pour chaque problème, nous présentons des résultats expérimentaux sur des instances de réseaux réels.
La deuxième partie de cette thèse présente les développements logiciels qui ont été entrepris. Le premier chapitre présente le logiciel Porto dédié à la résolution de problèmes de routage, groupage et protection dans des réseaux optiques utilisant trois niveaux de brassage. Dans un second chapitre nous présentons le logiciel Mascopt, une bibliothèque d'optimisation pour le domaine des graphes et des réseaux qui a servi notamment à réaliser les expérimentations présentées dans la première partie.
Trampont, Mathieu. "Modélisation et optimisation du déploiement des réseaux de télécommunications : applications aux réseaux d'accès cuivres et optiques." Paris, CNAM, 2009. http://www.theses.fr/2009CNAM0667.
Full textThis dissertation presents works on telecommunication access networks optimization. The access network gather the traffic of clients in an area, before transmitting it to the core network. It is a hierarchical network with a central concentrator at the top, the clients at the bottom, and one or two layers of equipements. We focus on two applications : the optimization of the access of the telephone telecommunication network on a new territory, and the optimization of the installation of an optical access network while taking into account an existing infrastructure. For the first application, we propose to improve existing methods and we propose new ones in order to obtain good solutions for different kinds of instances. For the optical network, the problem is to connect the clients to the central concentrator using 2 or 3 layers of optical splitters. The objective is to minimize the global installation cost. We propose new models for the location of splitters and for the choice of cables. Some tests show that good solutions can be obtained on real instances for the location of splitters
Izri, Nora. "Evaluation de performances des réseaux tout optiques à topologie en anneau." Versailles-St Quentin en Yvelines, 2012. http://www.theses.fr/2012VERS0014.
Full textThe increase in Internet traffic due to a sharp rise in requests for QoS (Quality of Service) by client applications, generates new constraints on the networks. These factors create a need in terms of bandwidth becoming higher, and a requirement to manage resources more efficiently. In this thesis, we evaluated the mechanisms of resources management in an all-optical ring using components OPADM (Optical Packet Add/Drop Multiplexer), offering a guarantee of QoS at the sub-wavelength. This ring can carry traffic from fixed and mobile networks. A study of fixed-mobile convergence at the physical layer was conducted. At our level, the fixed-mobile convergence results in the estimation of network capacity to support both fixed and mobile traffic, while meeting the QoS requirements of different traffic and operators. To achieve these goals, we proposed three approaches to convergence focusing on the need to separate fixed and mobile traffic in the electronics queuing or not, as well as the use of optical container traffic between fixed and mobile. These approaches have been studied by simulation. Our work has also focused on optical technology for dynamic reconfiguration of optical multiplexers as ROADM (Reconfigurable Optical Add/Drop Multiplexer). Thus, we studied the optimization problem of end-to-end delay of electronic packets by proposing the channels aggregation approach, taking into account the QoS parameters. We have developed analytical and numerical models to validate this proposal
Elbiaze, Halima. "Application des techniques de contrôle d'accès à la garantie de QoS dans un réseau optique multiservice." Versailles-St Quentin en Yvelines, 2002. http://www.theses.fr/2002VERS004V.
Full textAboujeib, Joumane. "Systèmes de commutation optique à base d'une cellule acousto-optique multi-transducteurs pour les réseaux de télécommunications : optimisation et caractérisation." Brest, 2008. http://www.theses.fr/2008BRES2015.
Full text“All optical networks”, with optical routing and switching components, seems to be the way for telecommunication networks development. This work deals with the characterizations of free space optical packet switches based on acousto-optic technology. The adopted solution is the use of a Bragg cell in which two diffraction gratings can be superimpose simultaneously. The switch is made with a TeO2 crystal provided with piezoelectric planas phased array transducers, and a specific electronic command. In the first part of this work, we present the optical switching function in optical networks, and various technologies used to realize this function. Then, we recall the physical acousto-optic interaction in the Bragg regime, the operating principle of the rnulti-transducers acousto-optic cell, and the consequences of the superposition of two diffraction gratings in a single crystal. In a second section part, we present the design of the 2x2 switch. We study experimentally the spurious effects at the cell output and we deduce the switch crosstalk. After the optimization of the switch, the system is characterized. The measurements show that die switch presents low crosstalk, low switching time, low sensitivity to the polarization, and transparency with the transmission rate. We show in the last part, that using a Bragg cell with planar phased array transducers driven by an appropriate electronic command (based on the direct synthesis of frequency) allows to improve the bandwidth of the deflector compared to other solutions proposed in the literature
Torkestani, Seyed Sina. "Contribution à l’étude d’un réseau de communications optiques sans fils indoor : application à la télésurveillance en milieu hospitalier." Limoges, 2012. http://aurore.unilim.fr/theses/nxfile/default/39959db3-b156-4d92-bfa9-fc57efa87f84/blobholder:0/2012LIMO4032.pdf.
Full textThis study focuses on performance analysis of optical wireless technology as an alternative solution to the radiofrequency one, for healthcare monitoring applications in hospital environments. In this context, an Infrared transmitter is placed on a patient coupled with medical sensors. Moreover, the patient is mobile in the defined environment. The receiver is fixed placed on the middle of the ceiling. Different transmission configurations are considered : optical wireless links with a line of sight propagation and different types of tracking systems and diffuse links based on reflections from environment surfaces. We consider three mobility models for the emitter : uniform, Gaussian and Random WayPoint. For each mobility model and for each configuration, we obtain the statistical distributions of the channel static gain and signal to noise ratio. For this purpose, we use either analytical expressions or a ray-tracing software especially for the diffuse case. In order to evaluate performance, we estimate the outage probability i. E. The probability of the link failure in terms of data rates, transmitted powers and quality of service. We show that in all configurations, this technology permits performing mobile healthcare monitoring according to the required quality of service. In order to have a simple and robust solution against possible link shadowing, we chose the diffuse solution as the best trade-off even though it requires more transmitted power than the line of sight links. To overcome this drawback, we study the possibility of using channel coding by calculating the outage capacity with permits decreasing the transmitted power to a value as low as the one for line of sight propagations
Morea, Annalisa. "Étude des réseaux optiques translucides : évaluation de leur faisabilité et de leur intérêt économique." Paris, ENST, 2006. http://www.theses.fr/2006ENST0050.
Full textThe arrival and mastery of new optical transmission technologies and all-optical switching of signals in optical networks allow the introduction of transparency in the core network. In transparent networks, optical signals are not converted to electronic signals except when added or dropped. A translucent transport network is half way between an opaque network (systematic opto-electrical conversion at each node) and a transparent network. This type of network provides a trade-off between transparency and opacity and permits : Alleviate the need for opto-electrical devices without restricting either the length of connexions in the network or the wavelength constraint, assuring a balance between signal performance at reception and total network cost. Operation of the network independent of certain signal characteristics (bit rate, modulation, etc) making the network more adaptive to developments. These aspects make this type of network very attractive for providers, such as France Télécom. The goal of this thesis is to determine network feasibility and the advantages that could be brought to the backbone network. This study is original in the use of physical constraints linked to network dimensioning; these features are the main research axes of the present work
Teimoori, Hassan. "Commutation de paquets dans les réseaux optiques transparents à partir de fonctions logiques tout optiques." Phd thesis, Télécom ParisTech, 2007. http://pastel.archives-ouvertes.fr/pastel-00003084.
Full textImbrosciano, Sébastien. "Flots et chemins contraints : applications aux réseaux de télécommunications." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4001/document.
Full textIn this thesis, we study some optimization problem applied to telecommunication networks. We study fiber optical networks and sensor networks. We are interested to analysis and design for these types of networks. The issues studied are: for fiber optic networks, minimize the cost of deployement and ensure quality of service; for sensors network, ensure the safety of transmissions and the energy consumed. To solve these problems we use techniques as graphs theory, complexity, linearprogramming, generalized flows and paths with resource constraints. The first problem is to minimize the cost to deploy a fiber optical network which connect a set of customers to a connection node through a set of splitter and deal about technological constraints imposed by the standard. We propose a model and a method of resolution for this problem. The second problem is a flow problem with delay constraint where time to cross a edge is proportional to the amount of flow that flows thereon. We offer a proof of NP-completeness in the general case, an approximation algorithm factor 2 in the case where the support graph is a path and an estimated experimentally an heuristic that calculates good solutions for instances of real sizes. Finally, we propose two protocols for sensor networks, which resulted in two patents. The first, based on a distributed algorithm, calculates a set of disjoint paths between terminals. The second maximizing the lifetime of sensors powered by batteries. The results of numerical experiments are also presented
Roger, Charlotte. "Étude des mécanismes de contrôle et allocation de ressources applicables aux réseaux optiques d'accès et collecte de nouvelle génération." Rennes 1, 2010. http://www.theses.fr/2010REN1S133.
Full textToday where the FTTH deployments become more and more important, the study of an architecture which permit the re-use of PON infrastructure become more and more necessary. With the bit rate expected for the five next years, the employ of transparent technologies, like OBS or OPS, appear to be an interesting solution for economic and energetic point of view. A network architecture that integrates several WDM PON access segments in a metropolitan area network and uses optical burst switching is presented in this thesis. This architecture targets the delivery of very high speed end to end optical communications between the edge nodes connecting the end users. Different protocols which can be used in transparent network are been studied: WR-OBS (Wavelength Routed OBS) and an adaptation of PON mechanisms. In order to face future network evolutions we proposed an all-optical access-metro network which allows the simultaneous support of fixed and mobile services, in a fully integrated approach. In this architecture user's data can be transmitted according to two transmission modes: a circuit mode and a burst mode, in order to provide an all-optical end to-end communication
Cadéré, Christian. "Politiques d'allocations de ressources dans les réseaux optiques." Versailles-St Quentin en Yvelines, 2010. http://www.theses.fr/2010VERS0036.
Full textThis thesis was done within the frame of the CARRIOCAS project of the System@tic competitiveness pole and of the ECOFRAME project. The first aspect that is studied, is the study of data transportation in a slotted optical network, in which routers have optical memories (a delay loop). We show that minimizing the overall delay of a flow (i. E. The delay of its longest elementary path) is a NP-complete problem. We analyse through simulations the efficiency of a simple heuristic algorithm allowing an online resource allocation in the ring and measure the impact of those loops for the application acceptance rate. The second aspect concerns the resource virtualization mechanisms in the network. We study this problem through graph mapping and prove the NP-completeness of the associated problems. We propose an online routing algorithm aiming for the best use of network resources while satisfying the hard QoS constraints of the applications. We analyse through simulations its efficiency to map the applications. Finally, the third aspect that we study is the study of resource aggregation policies. The CARRIOCAS network is made of several entities: the network that provides connectivity and IT services and the clients. However, the client demands generally have a too small granularity for the network to analyse them one by one and efficiently allocate its resources. We thus have to consider an intermediary entity that we name access provider that will aggregate the client demands and send requests of sufficient size to the network in order to maximize the chances that these requests are accepted. These aggregation choices are hard to make, because the access provider doesn't know the characteristics of the network. We study the dynamic learning of an aggregation policy by the access provider using a game, where the search for Nash equilibriums is made using a re-inforcement learning algorithm (Linear Reward-Inaction)
Chapeleau, Xavier. "Réflectométrie en lumière incohérente : synthèse expérimentale de réseaux de Bragg fibrés." Nantes, 2004. http://www.theses.fr/2004NANT2012.
Full textGharaei, Mohammad. "Nouveaux concepts pour les réseaux d'accès optiques." Paris, Télécom ParisTech, 2010. http://www.theses.fr/2010ENST0022.
Full textThis thesis deals with new concepts for future optical access networks. Firstly, optical private networking over PON is studied as it can potentially improve the QoS performance and security issue of conventional internet protocol based virtual private networks. A decentralized private networking traffic from PON traffic is a profitable approach to increase network throughput performance. We study the implementation of multiple optical private networks over PON layout using OCDMA technique via ring as well as star topology. The power budget and the network scalability of these architectures are analyzed and tested experimentally. These two architectures are demonstrated to have a negligible impact on the functionality of PON which proves the efficiency and the feasibility of simultaneous optical PNs over PON layout. Then, capacity performance of WDM/OCDMA networks is analyzed since hybrid networks are considered to improve multiplexing capacity of optical access networks. Physical layer limitations such as multiple access interference (MAI), beat noise and linear interchannel crosstalk are the major reasons for free error rate performance degradation. Crosstalk limitations have been evaluated to optimize user capacity performance. Then teletraffic capacity of WDM/OCDMA systems has been analyzed under the non-zero outage probability constraints to demonstrate a flexible capacity performance. Finally, it has been demonstrated that using WDM (de)multiplexers with lower crosstalk levels accompanying OCDMA encoders/decoders with good correlation properties, causes the teletraffic capacity to be closer to the nominal capacity
Coutelen, Thomas. "Loss-free architectures in optical burst switched networks for a reliable and dynamic optical layer." Thesis, Evry, Institut national des télécommunications, 2010. http://www.theses.fr/2010TELE0010/document.
Full textFor the last three decades, the optical fiber has been a quite systematic response to dimensioning issues in the Internet. Originally restricted to long haul networks, the optical network has gradually descended the network hierarchy to discard the bottlenecks. In the 90's, metropolitan networks became optical. Today, optical fibers are deployed in access networks and reach the users. In a near future, besides wireless access and local area networks, all networks in the network hierarchy may be made of fibers, in order to support current services (HDTV) and the emergence of new applications (3D-TV newly commercialized in USA). The deployment of such greedy applications will initiate an upward upgrade. The first step may be the Metropolitan Area Networks (MANs), not only because of the traffic growth, but also because of the variety of served applications, each with a specific traffic profile. The current optical layer is of mitigated efficiency, dealing with unforeseen events. The lack of reactivity is mainly due to the slow switching devices: any on-line decision of the optical layer is delayed by the configuration of the. devices. When the optical network has been extended in the MANs, a lot of efforts has been deployed to improve the reactivity of the optical layer. The Optical Circuit Switching paradigm (OCS) has been improved but it ultimately relies on off-line configuration of the optical devices. Optical Burst Switching (OBS) can be viewed as a highly flexible evolution of OCS, that operates five order of magnitude faster. Within this 'architecture, the loss-free guaranty can be abandoned in order to improve the reactivity of the optical layer. Indeed, reliability and reactivity appear as antagonists properties and getting closer to either of them mitigates the other. This thesis aims at proposing a solution to achieve reliable transmission over a dynamic optical layer. Focusing on OBS networks, our objective is to solve the contention issue without mitigating the reactivity. After the consideration of contention avoidance mechanisms with routing constraints similar as in OCS networks, we investigate the reactive solutions that intend to solve the contentions. None of the available contention resolution scheme can ensure the 100% efficiency that leads to loss-free transmission. An attractive solution is the recourse to electrical buffering, but it is notoriously disregarded because (1) it may highly impact the delays and (2) loss can occur due to buffer overflows. The efficiency of translucent architectures thus highly depends on the buffer availability, that can be improved by reducing the time spent in the buffers and the contention rate. We show that traffic grooming can highly reduce the emission delay, and consequently the buffer occupancy. In a first architecture, traffic grooming is enabled by a translucent core node architecture, capable to re-aggregate incoming bursts. The re-aggregation is mandatory to "de-groom" the bursts in the core network (i.e., to demultiplex the content of a burst). On the one hand, the re-aggregation highly reduces the loss probability, but on the other hand, it absorbs the benefits of traffic grooming. Finally, dynamic access to re-aggregation for contention resolution, despite the significant reduction of the contention rate, dramatically impacts the end-to-end delay and the memory requirement. We thus propose a second architecture, called CAROBS, that exploits traffic grooming in the optical domain. This framework is fully dynamic and can be used jointly with our translucent architecture that performs re-aggregation. As the (de)grooming operations do not involve re-aggregation, the translucent module can be restricted to contention resolution. As a result, the volume of data submitted to re-aggregation is drastically reduced and loss-free transmission can be reached with the same reactivity, end-to-end delay and memory requirement as a native OBS network
Trinel, Jean-Baptiste. "Amplificateurs à fibres dopées erbium légèrement multimodes pour les futurs réseaux de télécommunications." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10094/document.
Full textThe capacity crunch announced for single mode long-haul telecommunication networks necessitates the study of new technologies able to meet the ever-growing needs of users. The technology of space division multiplexing seems promising and necessits to adapt/to develop all the fiber components that make up an optical fiber network to a high level of performance for future implementation of an optical cable based on SDM technology. The purpose of this thesis consists in pursuing the works introduced on this topic by associating theory and experiments so as to realize optical repeaters adapted to mode division multiplexing in few-mode fibers. The main constraint for this kind of amplifiers is to realize the simultaneous gain equalization of the different telecommunications channels: spatial modes and wavelengths. Numerical tools have been developed to model and optimize these amplifiers so as to explore numerous configurations and identify the most appropriates. Particularly, a numerical model taking into account mode beating and mode coupling induced by the amplifying medium has been developped. Within the framework of this study, a new fibre configuration with micro-structured core allowing to overcome the limitations of the conventional fabrication methods has been studied. This fiber configuration is very predictive and can provide high and equalized gain over the different channels while optimizing the energy efficiency of the component. Another dimension of this thesis has been to study the possibility to integrate few-mode fiber amplifiers in the current single mode network, in order to share the amplification function and so realize cost savings
Narbonneau, François. "Dissémination ultra-stable d'étalons de fréquence par fibre optique du réseau télécom métropolitain." Rennes 1, 2007. http://www.theses.fr/2007REN1E004.
Full textNgo, Minh Thanh. "Eléments d'analyse des réseaux d'accès optiques et ingénierie de trafic sur ces réseaux." Evry, Institut national des télécommunications, 2009. http://www.theses.fr/2009TELE0010.
Full textIn recent years, the telecommunications industry observes a tremendous increasing of broadband access penetration level. Indeed, the number of subscribers with access to broadband Internet connections either at home or work is growing steadily. This can be explained both by the emergence of rich content applications and by the drop in access prices due to the broadband technologies' evolution and the fierce competition between access networks operators. The current trend in wired access networks are FTTx optical technologies (Fiber To The Home / Curb / Building / Premises), which present an alternative to xDSL networks (using copper loops deployed primarily for the phone system) and cable networks (using cable infrastructures originally deployed for TV distribution). The optical access networks differ first by the physical medium used to carry information. In the case of optical access networks, it is fiber, which have the largest capacity of all physical media used today. Using such a physical medium would potentially provide more bandwidth to the subscribers. However, optical access network architectures raises many issues. For economic reasons, it is necessary to limit both civil engineering (which cost is dominant), and the number of active equipments (which cost more than passive equipment from CAPEX and OPEX points of views). A popular solution is to deploy a tree architecture, and to focus the intelligence of the access network (active elements) at the root of the tree: this corresponds to a Passive Optical Network (PON). The absence of active equipment in the terminals, and the sharing of transmission capacity of fiber among several users, especially for upstream traffic, require the implementation of mechanisms used for controlling multiplexing. These mechanisms are implemented in MAC protocols, which are the main subject of this thesis. Downstream traffic is broadcasted and each end-point filters its own traffic. On the other hand, upstream traffic has to be controlled in order to avoid collisions. The present thesis presents mechanisms that can be implemented in a MAC for Ethernet PON (EPON) in order to control upstream traffic. We show that the proposed mechanisms can support multiple classes of traffic, can couple resource allocation with access control and can finally efficiently use the upstream capacity of the EPON. The various mechanism proposed in the present work are mostly analyzed by simulation; this is because the overall behavior of a PON is too complex to be analytically analyzed, except for simple studies reported in Chapter 3. A comprehensive simulation framework, based on Network Simulator, has been designed and is presented in Chapter 4. This framework has enabled the comparison between state of the art mechanisms and our proposals. We show in Chapter 5 that our mechanisms are simple to implement and behave significantly better than classical mechanisms regarding real time traffic support, while ensuring a quasi-optimal use of upstream bandwidth. More generally, we show in Chapter 6 how our mechanisms are part of a global command plane for PONs. Conclusions and perspectives are outlined in Chapter7
Garnot, Mathieu. "Réseaux optiques de télécommunications multiplexés en longueur d'onde : Architectures et stratégies d'allocation de la longueur d'onde." Paris 11, 1998. http://www.theses.fr/1998PA112460.
Full textEl, Tabach Mamdouh. "Contribution aux études en communications numériques pour les réseaux optiques sans fil." Télécom Bretagne, 2010. http://www.theses.fr/2010TELB0107.
Full textLe, Pipec Mathieu. "Analyse d'une filière d'interconnexion adaptée aux systèmes de transmissions à haut débit par fibres optiques." Nantes, 2007. http://archive.bu.univ-nantes.fr/pollux/show.action?id=9bf42af7-1aed-4b46-a757-407ce4b059ad.
Full textThe main consequence of rising data rates in high density optical fibre telecommunications systems is the need for ever increasing component integration in both receiver and transmitter front ends. This observation has governed the work of this thesis which is devoted to helping the designer to make the right choice in the key area of interconnection technologies and to propose design rules for implementing these technologies. The first two chapters of this thesis describe the architectures of commonly deployed high data rate optical fibre systems. The principal components used in these systems are also presented as are their main characteristics. The second part concerns the selection of the right interconnection technology taking into consideration the system performances required and the constraints imposed by the necessities of component integration. A theoretical electromagnetic study of appropriate propagating structures is backed up by measurement of these structures and confirms the interest of conductor backed coplanar waveguide structures for this application. The final part of this work introduces the notion of integration with regard to a classical component such as a packaged Mach-Zehnder modulation driver and the resulting influence on the overall optical fibre system performance as measured by eye diagram and Bit Error Ratio. The analysis of the results of the electromagnetic simulation of the proposed structures allows us to propose equivalent circuit models of the transitions developed, which can be readily integrated into circuit simulators
Berthomé, Pascal. "Contribution à l'algorithmique des architectures parallèles : des réseaux point-à-point aux réseaux optiques." Lyon 1, 1995. http://www.theses.fr/1995LYO10031.
Full textFall, Abdoulaye. "Réflectométrie optique dans le domaine fréquentiel pour l’analyse des réseaux locaux domestiques optiques." Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0011/document.
Full textIn order to develop high capacity future-proof home network, the FUI 12 RLDO project suggests passive star network topology using multimode couplers. This topology encounters implementation difficulties due to the non-uniformity of the power distribution in the output ports of multimode couplers. Analyzing this problem shows that the properties of modes propagating in the network elements plays a key role in this non-uniform characteristics of multimode couplers. In order to characterize these modes propagating in the network, we have developed a complex optical frequency domain reflectometry (OFDR) setup. The phenomena limiting the sensitivity to the phase in OFDR – in fact, those related to the non-linear frequency tuning of the laser source - are investigated to contribute to a better understanding of the limiting mechanisms. Then we have tested the intensity and phase measurement performance of the developed setup. Later, we studied the optimal resolution conditions to characterize the modes in a multimode waveguide. We have also analyzed the uncertainty of the measurement of the chromatic dispersion of modes in case where it is impossible to determine whether one or several modes are present in a given dispersion curve. Additionally, we have introduced an adaptive time-frequency method, to obtain the dispersion curves with optimal resolution. This method allows us to show the versatility of the special RLDO multimode fiber (single-mode behavior under single-mode excitation at 1310 nm and 1550 nm). The analysis of the propagation in the optical fibers, associated with a model we have developed to study the behavior of multimode couplers, has permitted to explain encountered difficulties with the experiments of the multimode passive star network topology. This also gives insights to develop a functional prototype of network
Loukina, Tatiana. "Étude théorique et expérimentale de réseaux de diffraction pour les télécommunications optiques : Application à la réalisation d'un égaliseur de spectre." Brest, 2003. http://www.theses.fr/2003BRES2014.
Full textSince the mid-1990s, due to the internet boom, the optical communications market has grown by leaps and bounds, especially the long-haul communications segment, to meet the unprecedented demand for increases in the transmission capacity. The principal technologies which could reduce the cost of optical communications systems to a commercially viable level are wavelength division multiplexing (WDM) and optical amplification. The introduction of active and tunable components is currently making this new generation of optical communications network a dynamic one. This evolution has resulted in new requirements on components and sub-systems: on the one hand, spectral selective components to provide filtering or multiplexing functions; on the other hand, dynamic or reconfigurable components to minimize signal fluctuations during optical transmission. The theoretical study of the different types of diffraction gratings with respect to their spectral and energetic characteristics as well as their polarization sensitivity put to the fore the technical compromises in choice and fabrication of a diffraction grating for optical communications applications. Additionally for these theoretical arguments, our experience and our knowledge have led us to realise volume hologram diffraction gratings, recorded into dichromated gelatine. We have realized a Dynamic Spectral Equalizer prototype (DSE) which uses these diffraction gratings as demultiplexing / multiplexing optics. The demultiplexed input signal to be equalised is attenuated by quasi continuously Spectral Light Modulator (SLM). This device is original, polarization insensitive and made up of a suspension of nematic liquid crystal droplets in a polymer matrix (PDLC) whose state can vary continuously from opaque to transparent with the application of an electric field. After the characterization of this prototype of DSE, we have concluded that this project is commercially viable and is now being transferred into industry
Borrero-Molina, Armando. "Simulation of all-optical networks with deflection routing." Versailles-St Quentin en Yvelines, 2004. http://www.theses.fr/2004VERS0021.
Full textIn 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
Koubàa, Mohamed. "Routage, protection et ingénierie de trafic dans les réseaux WDM tout-optiques." Phd thesis, Télécom ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001947.
Full textKchikech, Mustapha. "Algorithmes de multicoloration, de coloration de chemins, et de radio k-étiquetage de graphes : applications aux réseaux tout-optiques WDM et aux réseaux cellulaires." Dijon, 2005. http://www.theses.fr/2005DIJOS030.
Full textLegrand, Thomas. "Les réseaux de paquets optiques en mode « burst » : la résolution de leurs contentions." Rennes 1, 2009. http://www.theses.fr/2009REN1S146.
Full textThis thesis presents a new OBS architecture called “Label-Switched OBS” and numerically compares its performances with the ones of conventional OBS and Offset Time Emulated OBS. This thesis discusses burst contention resolution mechanisms in spectrum and time domain for these three network architectures as well as routing issues. The thesis introduces a new scheduling algorithm and compares it with the Latest Available Unused Channel with Void Filling algorithm. The experimental part of this thesis describes our test bed based on a Label-Switched OBS core node. It provides the means to investigate burst contention resolution mechanisms in spectrum and time domain. Our experimental results confirm the node capability to resolve the burst contentions, in spectrum and time domain
Fafchamps, Damien. "Communications numériques dans les réseaux d'accès optique : modélisation, codage, performances." Paris, ENST, 2010. http://www.theses.fr/2010ENST0083.
Full textOptical communications got involved in techniques emerging from information theory very recently with the introduction of error correcting codes in 10 Gbitsls systems in the late 90s. Ever since then, attempts of adapting advanced code schemes has been on the increase such as concatenated convolutional codes, LDPC or Turbo codes. These are prospective works that have not led to standards yet. One of the necessary conditions for the optimization of digital communication systems is to adapt digital techniques to the communication channel. So coding schemes must be adapted to the optical context but modelization of the optical channel is completely different from the radio channel. This thesis is interfacing the domain of optical communications and the information theory applied to coding. This work led to a proposal cstatistical model describing the optical channel and aiming at combining precision and analytical simplicity in order to keep the model workable for coding. This model has been verified in the context of a three-year project dealing with the study and prototyping of an optical metropolitan network (ECOFRAME). Our contribution consists of the implementation of a simulator which allowed us to validate the theoretical model of the optical channel and to study the impact of the network configuration on the signal statistics. We highlighted decision strategies and decoding schemes adapted to the optical channel. In collaboration with ENSIL, we pointed out the impact of the channel modelization on LDPC codes performance in optical
Reinhard, Vincent. "Méthodes d'introduction de QoS dans un réseau optique à capacité surmultipliée." Versailles-St Quentin en Yvelines, 2012. http://www.theses.fr/2012VERS0062.
Full textIn this thesis we investigate methods to increase the performance of a high-speed optical network (CARRIOCAS, 40 Gbps). By giving the users strict QoS guarantees on the one hand, and by minimizing the bandwidth used by multicasts on the other hand. We first propose a mechanism allowing a centralized control for the applications data insertion in the network. Our mechanism uses a buffer for each application using the network. Using buffers allows us to use queuing theory models in order to respect a maximum delay for sending data. In a second part of this thesis, we investigate new methods to satisfy multicast requests. Indeed, in the CARRIOCAS network, a fixed number of network nodes are able to duplicate data. This induces a new constraint on the construction of any mutlicast tree. We propose new methods to satisfy multicast demands while respecing this constraint, in order to minimize the bandwidth consumed
Baraketi, Sami. "Ingénierie des réseaux optiques SDH et WDM et étude multicouche IP/MPLS sur OTN sur DWDM." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30013/document.
Full textOptical transport networks currently constitute base infrastructures for modern day telecommunications systems. Given the huge investments required for deploying these networks, and in particular concerning equipment costs (fiber optics, cards, transponders, etc.), routing optimization and resource allocation are indispensable issues for mastering the operational expenditures (OPEX). In this context, the work conducted in this thesis handle a set of resource allocation problems which arise while planning not only optical SDH (Synchronous Digital Hierarchy) and WDM (Wavelength Division Multiplexing) networks, but also multilayer ones based on an optical transport layer. First, the circuit routing problem in SDH networks is tackled with the main objective of minimizing the bandwidth fragmentation. This problem is formulated as an Integer Linear Program (ILP) integrating a set of realistic routing, transmission and cross-connect constraints and using granular resource costs. An exact algorithm and two heuristics are proposed to solve this problem. The rerouting problem of SDH circuits, which faces operators when it becomes absolutely necessary to reduce the bandwidth fragmentation in the network, is also addressed. For real instances of the studied problems, it is shown that the proposed methods provide considerable economic gains. Second, two planning problems for WDM network optimization is tackled. The first problem is that of the logical network design, or in other words that concerned with the definition of lightpaths to route a set of traffic demands with a minimum transponder cost. The second problem is related to the routing and the wavelength assignment: how to route the previously defined lightpaths so as to minimize the total number of assigned wavelengths while respecting a set of technological constraints? These two problems are formulated as Integer Linear Programs (ILPs) and are solved using efficient heuristics, based on a successive approximation for the first problem and a decomposition approach for the second one. Here again, experimental results show that the proposed methods allow obtaining good quality approximations for large scale instances. Finally, resource allocation in new generation multilayer networks, that is IP/MPLS over OTN (Optical Transport Network) over DWDM (Dense WDM), is addressed. In this case, the question that most of the operators seek to answer is how to route layer 3 traffic demands while optimizing resource allocation, not only in the IP/MPLS layer, but also in the underlying OTN and DWDM layers. For this purpose, a new multilayer optimization model is proposed. It takes into account a hierarchy of material constraints and defines a tradeoff between the resource costs in the three network layers. The set of proposed optimization algorithms have been integrated into the network planning and optimization environment NEST of QoS Design, which is used by major operators to plan their network
Letort, Cédric. "Modélisation, implantation et caractérisation de fonctions de routage tridimensionnel de canaux optiques pour les réseaux WDM." Rennes 1, 2007. http://www.theses.fr/2007REN1S046.
Full textThe avenment of selective optical transparency (wavelength insertion-extraction and cross-connect) in WDM network optical nodes is a fundamental study dedicated to find some new transmission architectures. In this frame, the Wavelength Selective Switch appears as a key component to obtain a flexible management of optical network nodes diplaying both wavelength selective optical routing and optical channel power control functions. The study we present here is based on optical beam digital deflection with high flexibility, obtained with diffraction grating displayed on a liquid crystal spatial light modulator. We describe here the integration and test of an holographic deflector using LCOS (Liquid Crystal On Silicon) technology whose parameters of realization are optimized for an optical transmission network environment. The modeling of a reconfigurable fibre to fibre optical interconnections system based on holographic deflection leads to the optimization of the adressing map and to the realization of a specific bidimensionnal monomode fiber array with high capacity. All these elements are assembled in a holographical switch prototype whose optical functions are tested
Duong, Thanh Nga. "Étude de techniques de modulation multi-porteuse OFDM pour la montée en débit dans le réseau d'accès optique." Rennes 1, 2010. http://www.theses.fr/2010REN1E005.
Full textMaran, Jean-Noël. "Lasers multi-longueurs d'onde à fibre dopée à l'erbium utilisant un décaleur de fréquence dans la boucle de contre-réaction." Rennes 1, 2004. https://tel.archives-ouvertes.fr/tel-00012177.
Full textHuiban, Gurvan. "Le problème de la reconfiguration dans les réseaux optiques multifibres." Phd thesis, Université de Nice Sophia-Antipolis, 2006. http://tel.archives-ouvertes.fr/tel-00123437.
Full textune demande donnée, avec un certain objectif. Avec le temps, la demande
d'exploitation du réseau change. C'est dans ce contexte que se pose le
problème de la reconfiguration: être capable de changer la configuration du
réseau de manière à l'adapter à des nouvelles demandes. Pour ce faire il faut
généralement interrompre totalement ou partiellement le trafic. Étant données
les quantités de données y circulant, il n'est guère envisageable d'arrêter le
réseau. De nombreux paramètres sont à prendre en compte afin de déterminer ce
que sera une bonne solution, et plusieurs métriques peuvent être utilisées
pour mesurer la qualité d'une solution.
Dans une première partie, nous nous intéressons au problème de la
reconfiguration comme problème d'optimisation mono-objectif. Nous proposons un
modèle mathématique permettant de représenter le problème. Cependant, le
résoudre exactement peut être très coûteux en temps de calcul. Nous proposons
également une heuristique gloutonne et une heuristique basée sur le recuit
simulé. Les solutions obtenues présentent différentes caractéristiques selon
la métrique optimisée. L'algorithme glouton est rapide et trouve des solutions
décentes. L'algorithme du recuit simulé obtient des solutions qui sont
comparables aux solutions optimales.
Dans une seconde partie, nous nous intéressons à l'aspect multiobjectif du
problème. Il consiste à considérer simultanément les différentes métriques et
rechercher un ensemble de solutions représentant différents compromis
intéressants. Puis nous proposons un algorithme basé sur notre modélisation
mathématique. Nous adaptons également un algorithme évolutif. Donner une
certaine flexibilité par rapport à une métrique permet généralement
d'améliorer de manière significative les solutions obtenues par rapport aux
autres métriques.
Cordette, Steevy. "Continuum de fréquences optiques pour application OCDMA." Phd thesis, Télécom ParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00582653.
Full textRamecourt, David. "Etude de la photosensibilité et de la stabilité de réseaux d'indice inscrits dans des fibres optiques germanosilicates hydrogénées." Lille 1, 2001. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2001/50376-2001-151.pdf.
Full textAntona, Jean-Christophe. "Nouveaux outils pour l'estimation de la qualité de transmission et l'optimisation de réseaux optiques modulés à 10 Gb/s, 40 Gb/s et 100 Gb/s." Paris, Télécom ParisTech, 2011. https://pastel.hal.science/pastel-00678415.
Full textOver the last decades, optical fibre has become the preferred medium for conveying data across cities, regions, nations, continents. Laboratory but also commercial Wavelength-Division Multiplexed systems offer multi-Terabit/s capacity based on 10, 40 or even 100Gb/s-modulated channels propagating at different wavelengths over more than a thousand kilometres in order to cope with the increase of the data traffic. Yet, an efficient design of high speed optical transmission systems or optical networks at lowest cost with ever increased throughput or reach is a big challenge. It requires a very subtle knowledge of the interplay of multiple linear and nonlinear physical phenomena. Besides, the infrastructure of optical networks is highly heterogeneous with a high impact of legacy systems. Eventually, when building a novel network or upgrading a network, the system designer has only a partial knowledge of the physical features of the deployed infrastructure. To master such complexity in a reasonable time scale, the design and the expected physical performance of transmission systems generally strongly rely on tools derived from physics laws and observations. This manuscript particularly addresses such issues: based on studies conducted over years 2000 to 2010 to understand and quantify the accumulation of Kerr nonlinearities in transmission systems with bit-rates ranging from 10 to 100Gb/s, we introduce novel tools that aim to rapidly and accurately predict the quality of transmission of heterogeneous terrestrial optical networks impacted by multiple propagation effects and to help optimizing the system design such as the setting of fibre input power or dispersion management
Belfqih, Zineb. "Etudes de l'augmentation de capacité des réseaux d'accès optiques de types PON basés sur l'accès multiple à répartition dans le temps." Télécom Bretagne, 2008. http://www.theses.fr/2008TELB0077.
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