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Literatura científica selecionada sobre o tema "Fibres optique multicoeur"
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Teses / dissertações sobre o assunto "Fibres optique multicoeur"
Suran, Eric. "Imagerie discrète dans un réseau de guides optiques réalisé par inscription femtoseconde : focalisation discrète dans une fibre optique multicoeur". Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/21087bc8-36f0-49fe-819d-1587fa690759/blobholder:0/2009LIMO4065.pdf.
Texto completo da fonteHigh resolution imaging for cellular scale in biolical an medecine research has reached a high reliability and currently gives a lot of scientific results for example with two-photon absorption microscopy. The new development step is now to use optical waveguides to transport light directly through cells. In the frame of SYDIMEN project, this thesis present a study that evaluate the feasibility of using optical waveguides with several coupled cores in a specific propagation scheme called “discrete diffraction”. After giving a definition of what is a discrete system, two settings using these devices are successively demonstrated numerically and experimentally: discrete imaging and discrete focusing
Eustache, Clément. "Capteurs fibrés à base d'ondes de surface de Bloch". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCD028.
Texto completo da fonteThe in-situ detection and analysis of small physical, chemical, or biological quantities in hard-to-reach environments is significantly impacting numerous scientific, medical, and industrial fields. Despite being a leading miniaturized solution for this challenge, the "Lab-on-tip" concepts, usually confined at the fiber core, face limitations in detection resolution. My thesis aims to explore a new generation of "Lab-on-tip" systems, based on a core-to-core optical interconnection at the fiber tip, either between various cores of an individual multicore fiber or two standard single-core fibers. This innovative approach leverages nano-optical platforms based on Bloch surface waves. Bloch surface waves are evanescent electromagnetic modes that propagate over millimeter distances on the top surface of a one-dimensional photonic crystal. These waves ensure core-to-core optical interconnection and the probing of their environment. The fiber modes and the Bloch surface waves are coupled by milling subwavelength diffraction gratings above each core, on top of the photonic crystal. We have developed three nano-optical platforms: two at the end of four-core fibers and another on the end-face of a ferrule combining two standard single-mode fibers. Our experiments demonstrated core-to-core coupling that can be controlled by the polarization of the incident light, enabling agile detection and demultiplexing functions. These platforms have been tested as refractometers for detecting volatile organic compounds, showcasing their potential as sensors. Our fiber-integrated architectures allows for light excitation and detection signals to travel through different channels within optical fibers, simplifying the detection process and optimizing signal-to-noise ratio. These fiber-integrated nano-optical platforms hold promise for a wide array of applications, including sensing, optical trapping and manipulation, and information processing
Mothe, Nicolas. "Composants optiques à fibres multiples : applications à la sommation opto-microonde et aux fibres microstructurées mono et multicoeurs". Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/f0e822b2-4a8a-43d2-91ee-aa8e60c84380/blobholder:0/2009LIMO4042.pdf.
Texto completo da fonteThese research works presented in this manuscript aim at designing, realizing and characterizing the optical summation function of hyperfrequency signals. This operation constitutes a key element of the future phased array antennas and of the opto-hyperfrequency signal processing. The principle, commonly admitted, to realize the optical summation relies on the spatial separation of the different signals on the photodiode. This limitation aims to suppress the homo/heterodyne noises detrimental for the correct addition of the microwave signals. However, we numerically and experimentally demonstrate that this principle is not funded. The solution proposed here consists in encapsulating standard optical fibers in a silica tube and in tapering the whole to desired dimensions. A summator with 14 channels is fabricated this way. No fluctuation of the summed hyperfrequency power is observed even if the signals overlap significantly over the photodiode
COCQ, CYRIL. "Fiabilite mecanique des fibres optiques : prevision de la duree de vie des fibres multicoeurs et monocoeurs". Paris, ENSAM, 1999. http://www.theses.fr/1999ENAM0043.
Texto completo da fonteAbouseif, Akram. "Emerging DSP techniques for multi-core fiber transmission systems". Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT013.
Texto completo da fonteOptical communication systems have seen several phases in the last decades. It is predictable that the optical systems as we know will reach the non-linear capacity limits. At the moment, the space is the last degree of freedom to be implemented in order to keep delivering the upcoming capacity demands for the next years. Therefore, intensive researches are conducted to explore all the aspects concerning the deployment of the space-division multiplexing (SDM) system. Several impairments impact the SDM systems as a result from the interaction of the spatial channels which degrades the system performance. In this thesis, we focus on the multi-core fibers (MCFs) as the most promising approach to be the first representative of the SDM system. We present different digital and optical solutions to mitigate the non-unitary effect known as the core dependent loss (CDL). The first part is dedicated to study the performance of the MCF transmission taking into account the propagating impairments that impact the MCF systems. We propose a channel model that helps to identify the MCFs system. The second part is devoted to optical technique to enhance the transmission performance with an optimal solution. After, we introduced digital techniques for further enhancement, the Zero Forcing pre-compensation and the space-time coding for further CDL mitigation. All the simulation results are validated analytically by deriving the error probability upper bounds
Prevost, Florian. "Combinaison cohérente dans une fibre multicœurs pour des applications LIDAR". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLO003/document.
Texto completo da fonteCoherent Lidars can measure wind speed at long distance, using the Doppler frequency shift induced by the movement of the back reflecting aerosols. Wind Lidars usually include a MOPFA (Master Oscillator Power Fiber Amplifier) made of a continuous oscillator, an intensity modulator and a fiber amplifier. The main objective of this thesis is the realization of an eye-safe, high peak power, pulsed MOPFA using an erbium-doped multicore fiber. Single frequency pulse amplification in fibers is limited by nonlinear effects due to tight beam confinement in the core. Multicore fibers can be seen as a very large core fiber, thus mitigating the nonlinear effects. The pulse to be amplified is divided and injected into all cores of the amplifying fiber using a spatial light modulator (SLM). The amplified output pulses are then recombined at the fiber output by a diffractive optical element (DOE). The coherent combination at fiber output requires independent control of phases at injection provided by a feedback loop based on the DOE zero order power. The peak power after combination is the sum of the peak powers reached in each of the cores