Academic literature on the topic 'Commutation tout optique'
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Dissertations / Theses on the topic "Commutation tout optique":
Jeannes, Franck. "Dispositifs bistables à cavité-verticales pour la commutation tout-optique aux longueurs d'onde télécom." Aix-Marseille 3, 1996. http://www.theses.fr/1996AIX30040.
Simos, Christos. "Traitement ultrarapide de signaux optiques par effets non-linéaires quadratiques : échantillonnage optique et commutation spatiale par effet soliton." Limoges, 2002. http://www.theses.fr/2002LIMO0004.
The goal of this work is the study of the possibilities offered by the quadratic nonlinear effects for the realisation of ultrafast functions for all-optical processing of signals such as optical sampling, all optical switching and routing, wavelength demultiplexing, etc
METIN, DAVID. "Comportement spatio-temporel de films non lineaires. Application a la commutation tout optique." Besançon, 1995. http://www.theses.fr/1995BESA2075.
Gicquel-Guezo, Maud. "Absorbant saturable ultra-rapide à minipuits quantiques pour le traitement tout-optique du signal." Rennes, INSA, 2004. http://www.theses.fr/2004ISAR0009.
This thesis deals with the study of saturable absorbers based on Fe-doped InGaAs/InP multiple quantum wells (MQW). The non-linear optical properties of excitonic absorption are exploited for all-optical regeneration at 1. 55mm. A numerical model is developed for the calculation of the non-linear optical properties of MQW structures. The efficiency of Fe doping to shorten the absorption relaxation time is experimentally demonstrated and explained by a dynamic model of the carriers capture by Fe atoms. The insertion of Fe doped MQW into a microcavity, which resonance is matched to excitonic transition, reduces the switching energy by a 50-factor and enhances the contrast ratio (CR) to 8dB. Such a CR value increases the transmission distance of a numerical signal by more than 1000km at 10Gb/s, with a constant transmission quality. The response time can be reduced to 290fs and the CR stays at a relatively high value of 5dB
Gicquel-Guézo, Maud. "Absorbant saturable ultra-rapide à multipuits quantiques pour le traitement tout-optique du signal." Phd thesis, INSA de Rennes, 2004. http://tel.archives-ouvertes.fr/tel-00010801.
Peinke, Emanuel Thomas. "Commutation tout optique ultra-rapide de micropiliers semi-conducteurs : propriétés fondamentales et applications dans le domaine de l'optique quantique." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY030/document.
The resonance wavelengths of semiconductor optical microcavities can be changed within few picoseconds through the optical injection of free charge carriers. In this PhD thesis, we study in detail such “cavity switching” events for GaAs/AlAs planar and micropillar cavities, using the spontaneous emission of embedded QDs as an internal light source to probe the time-dependent frequencies of the cavity modes. Switching amplitudes as large as 34 mode linewidths are observed for optimized pumping conditions. Differential switching of micropillar modes is achieved by performing a localized injection of charge carriers, and modeled by taking into account their injection profile, diffusion and recombination processes. We investigate two important potential applications of cavity switching in the field of quantum optics. On one hand, we model the frequency conversion of light trapped in a cavity mode, which is induced by a switching event, and show that adiabatic and highly efficient frequency conversion can be achieved in properly designed planar cavities. On the other hand, cavity switching appears as a powerful resource to control in real-time the spontaneous emission of embedded emitters and more generally CQED effects. As a first example, we demonstrate the generation of few picosecond short pulses of incoherent light, using the spontaneous emission of switched QD-micropillars. We also show theoretically that cavity switching can be used to shape the time-envelope of single photon pulses emitted by a single QD, which is highly desirable for quantum-optical links and photonic quantum information processing
Koppa, Pàl. "Commutation de données par reconnaissance d'adresse binaire." Phd thesis, Université Paris Sud - Paris XI, 1995. http://pastel.archives-ouvertes.fr/pastel-00714180.
Guo, Zongxia. "Electrical and optical manipulation of exchange bias." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0204.
The rapid growth in scale and complexity of neural network architectures in today's machine learning and artificial intelligence applications is creating a significant demand for advanced hardware solutions. The semiconductor industry is actively seeking next-generation storage technologies that can offer improved speed, density, power consumption, and scalability. One such technology that shows great promise for high-performance data storage and processing is magnetoresistive random access memory (MRAM), which stores information in the magnetic state of materials. However, with the continuous requirement of high-density and ultrafast scenarios, antiferromagnet as the basic unit of MRAM shows obvious advantages. Antiferromagnetic materials have negligible macroscopic magnetism, making them highly robust to external magnetic fields. This property also allows for the absence of dipole interactions between adjacent bits, enabling higher-density integration. Additionally, antiferromagnetic materials exhibit high-frequency dynamics up to the terahertz range, theoretically enabling faster write speeds than ferromagnetic devices. However, such fully compensated magnetic moments make the magnetization state of the antiferromagnetic material difficult to manipulate and detect by traditional electrical methods. In this thesis, we demonstrate the antiferromagnetic exchange bias switching in three-terminal magnetic tunnel junctions and achieve electrical detection of antiferromagnetism by the tunnelling magnetoresistance with a ratio over 80%, which is two orders larger than previous methods. This is achieved by imprinting the state of antiferromagnet IrMn on the CoFeB free layer. We further realize current polarity-dependent switching, rather than current orientation-dependent switching of IrMn down to 0.8 ns. We identify two switching mechanisms, the heating mode and the spin-orbit torque driven mode, depending on the current pulse width. The latter case is supported by numerical simulations, which suggest that spin-orbit torque generated by Pt induces the precession of IrMn and exchange coupling at the IrMn/CoFeB interface determines the switching polarity of IrMn. Furthermore, to break the ferromagnetic and electrical write speed limit and further explore the antiferromagnetic switching speed, we experimentally realize exchange bias switching by a single femtosecond laser pulse. In the IrMn/CoGd structure, the perpendicular exchange bias is investigated for different IrMn thicknesses and CoGd concentrations. Using the optimized structure, the exchange bias was switched under a single femtosecond laser, and the dependence of the exchange bias variations with different laser fluence and pulse numbers was detailed investigated. The pump-probe time-resolved measurement is used to demonstrate the exchange bias switching time scale of less than 100 ps. The grain structure of polycrystalline IrMn films and the amorphous state of CoGd alloy layers are accurately described using atomistic simulations. The IrMn exhibits a faster demagnetization than ferromagnetic materials and each IrMn grain remagnetizing to a single-domain state in only 2 ps. In addition, the different grains of IrMn exhibit independent and stochastic probabilistic switching in the ultrafast time scale. The electrical and all-optical manipulation of exchange bias system allows ultrafast, field-free and energy-efficient control of antiferromagnet with high ordering temperature and thermal stability, making it highly suited to applications
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.
Teimoori, Hassan. "Commutation de paquets dans les réseaux optiques transparents à partir de fonctions logiques tout-optiques /." Paris : École nationale supérieure des télécommunications, 2008. http://catalogue.bnf.fr/ark:/12148/cb412463033.