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Rozprawy doktorskie na temat "Routage tout-optique"
Fen, Zhou. "Routage multicast tout optique dans les réseaux WDM". Phd thesis, INSA de Rennes, 2010. http://tel.archives-ouvertes.fr/tel-00541116.
Pełny tekst źródłaZhou, Fen. "Routage multicast tout optique dans les réseaux WDM". Rennes, INSA, 2010. https://tel.archives-ouvertes.fr/tel-00541116.
Pełny tekst źródłaIn this thesis, we studied the all-optical multicast routing (AOMR) problem in wavelength-routed WDM networks. With respect to the delay and link stress sensitive AOMR, an efficient algorithm based on avoiding multicast incapable branching nodes in light-trees is proposed. This algorithm is shown to be able to find a good tradeoff among the end-to-end delay, the link stress and the total cost. Regarding the power-aware AOMR, a more accurate and realist power loss model is defined for all-optical multicasting. Based on this new model, the power optimal design of light-trees is formulated by a mixed-integer programming (MILP). To achieve so, a set of novel linear equations is introduced to replace the nonlinear ones induced by the light splitters. In order to analyze the AOMR heuristic algorithms and assess their performances, the cost bounds of multicast light-trees and the approximation ratios of heuristic algorithms are derived mathematically in both unweighted and non-equally weighted WDM mesh networks. Concerning the cost optimal AOMR, a new structure called light-hierarchy is proposed. It is proven that the optimal structure is not the light-tree but the proposed light-hierarchy. Simulation results strongly suggest the employment of light-hierarchy for AOMR in WDM networks with sparse splitting
Liu, Qin. "Performance du routage par déflexion pour les réseaux tout optique". Versailles-St Quentin en Yvelines, 1999. http://www.theses.fr/1999VERS0020.
Pełny tekst źródłaChai, Yue. "Nonlinear propagation of unconventional beams in a photorefractive crystal". Electronic Thesis or Diss., CentraleSupélec, 2024. http://www.theses.fr/2024CSUP0005.
Pełny tekst źródłaThe 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
Chouman, Hussein. "Impairment-aware design and performance evaluation of all-optical wavelength convertible networks". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT011/document.
Pełny tekst źródłaThe continuous growth of Internet traffic implies an increased power consumption due to the many optical-to-electronic (OEO) conversions required by routers and switches. Transparent networks could curb this uncontrolled growth, but keeping the data in the optical domain has two adverse consequences: physical layer impairments accumulation which strongly degrades the performance due to amplication noise and non-linearities; and the wavelength continuity constraint (WCC) to keep the opticalsignal's wavelength unchanged in wavelength-division-multiplexed (WDM) optical networks which degrades network blocking performance. Wavelength converters (WCs) can alleviate the WCC constraint, but the only commercially available devices are the OEO-based WCs (OEO-WCs), however, their cost increases with bit-rates. On the other hand, all-optical wavelength converters (AO-WCs) have been demonstrated in research laboratories albeit with a limited conversion range and a performance that degrades converted signal's quality.In this thesis, we design the transmission layer using two different modulation formats sets with different bit-rates ranges; and consequently different performance estimation models. At the network level, our analyses show that WCs' contribution depends on traffic demands serving ordering in the online traffic assumption; that using xed-alternate routing (FAR) or least-loaded routing (LLR) algorithms and first-fit (FF) wavelength assignment algorithm, AO-WCs give the same performance enhancement as OEO-WCs. Moreover, we identify an optimum AO-WC conversion range and cascadability which shows that LLR requires lower number of conversions per channel compared to FAR
Chouman, Hussein. "Impairment-aware design and performance evaluation of all-optical wavelength convertible networks". Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT011.
Pełny tekst źródłaThe continuous growth of Internet traffic implies an increased power consumption due to the many optical-to-electronic (OEO) conversions required by routers and switches. Transparent networks could curb this uncontrolled growth, but keeping the data in the optical domain has two adverse consequences: physical layer impairments accumulation which strongly degrades the performance due to amplication noise and non-linearities; and the wavelength continuity constraint (WCC) to keep the opticalsignal's wavelength unchanged in wavelength-division-multiplexed (WDM) optical networks which degrades network blocking performance. Wavelength converters (WCs) can alleviate the WCC constraint, but the only commercially available devices are the OEO-based WCs (OEO-WCs), however, their cost increases with bit-rates. On the other hand, all-optical wavelength converters (AO-WCs) have been demonstrated in research laboratories albeit with a limited conversion range and a performance that degrades converted signal's quality.In this thesis, we design the transmission layer using two different modulation formats sets with different bit-rates ranges; and consequently different performance estimation models. At the network level, our analyses show that WCs' contribution depends on traffic demands serving ordering in the online traffic assumption; that using xed-alternate routing (FAR) or least-loaded routing (LLR) algorithms and first-fit (FF) wavelength assignment algorithm, AO-WCs give the same performance enhancement as OEO-WCs. Moreover, we identify an optimum AO-WC conversion range and cascadability which shows that LLR requires lower number of conversions per channel compared to FAR
Metnani, Ammar. "Routage par déflexion dans les réseaux tout optique à commutation de bursts". Thèse, 2004. http://hdl.handle.net/1866/16635.
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