Search results for " fibre"

showing 10 items of 285 documents

Détection et discrimination par émission acoustique des endommagements dans les composites. Comparaison expérience / modélisation

2011

International audience; On présente dans cette étude la discrimination des phénomènes de ruptures de fibre, de microfissuration intralaminaire, de macrofissuration intralaminaire ainsi que du microdélaminage au sein des composites stratifiés d'unidirectionnels orientés, dans le cadre d'une méthode de détection des endommagements basée sur la technique de l'Emission Acoustique. Ces résultats expérimentaux sont confrontés aux prévisions issues d'un modèle de comportement de matériaux composites unidirectionnels, basés sur la physique des phénomènes à l'échelle des constituants.

[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph][PHYS.MECA.MEMA] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph]fissuration[ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph][ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph][SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]rupture de fibreendommagementémission acoustiquedétection[SPI.MECA.MEMA] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
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Une méthode FE2 simplifiée appliquée à la modélisation de l'éclatement des réservoirs composites hautes pressions

2011

International audience; On propose dans cette étude la modélisation des phénomènes physiques à l'origine et induits par celui de rupture de fibre au sein d'un composite unidirectionnel. Cette modélisation, faite à l'échelle microscopique, permet de construire une base de données qui va décrire cette échelle au sein d'un procédé multiéchelles FE2 simplifié. Ce procédé est ensuite utilisé pour réaliser le dimensionnement à l'éclatement d'un réservoir composite bobiné.

[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph]réservoirsapproche multiéchelles[PHYS.MECA.MEMA] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph][ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph][ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph][SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]rupture de fibre[SPI.MECA.MEMA] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
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Real time measurement of long parabolic optical similaritons

2008

International audience; Long optical similaritons using a Raman fibre amplifier are generated. These pulses, with a highly parabolic profile, are monitored in real time on a high speed oscilloscope. Tunability of both the temporal and spectral widths of the pulses is then investigated.

[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics]Materials science02 engineering and technologyRaman amplifier01 natural sciencesOptical fibre amplifiers010309 opticssymbols.namesake020210 optoelectronics & photonicsOptics0103 physical sciencesSpectral width0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringOscilloscopeLaser beamsOptical amplifierOptical similaritons[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics][ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]business.industryPulse measurementFibre amplifiersymbolsRaman spectroscopybusinessOptical amplifier
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Classical wave thermalisation in chaotic multimode optical fibre

2023

[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics]Nonlinear opticsWave condensationChaotic dynamicsThermalisationWave turbulenceMultimode optical fibres[PHYS] Physics [physics]
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Offsetting Self-Phase Modulation in Optical Fibre by Sinusoidally Time-Varying Phase

2018

We report on our recent experimental and theoretical results on the use of a sinusoidally time-varying phase to suppress undesirable self-phase modulation of optical pulses propagating in fibre-optic systems.

[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics][PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]Materials scienceOptical fibergenetic structuresbusiness.industryPhase (waves)02 engineering and technology01 natural scienceseye diseaseslaw.invention010309 optics020210 optoelectronics & photonicsOpticsNonlinear fibre opticsModulationlaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringsense organsbusinessSelf-phase modulationPhase modulationComputingMilieux_MISCELLANEOUS2018 20th International Conference on Transparent Optical Networks (ICTON)
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Parabolic pulse generation and applications

2009

Parabolic pulses in optical fibers have stimulated an increasing number of applications. We review here the physics underlying the generation of such pulses as well as the results obtained in a wide-range of experimental configurations.

[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics][PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]Optical fiberMaterials science[ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]business.industryFiber nonlinear opticsNonlinear optics02 engineering and technology01 natural sciencesPulse shapingOptical fibre amplifierslaw.inventionPulse (physics)010309 optics020210 optoelectronics & photonicsOpticsOptical fiber amplifierslaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringOptoelectronicsbusinessComputingMilieux_MISCELLANEOUS
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Impact du profil de phase initial sur l'évolution asymptotique d'impulsions dans un amplificateur à fibre

2009

National audience; Nous étudions numériquement l'impact d'une dérive de fréquence initiale ou d'un saut de phase initial sur la dynamique asymptotique d'une impulsion se propageant dans un amplificateur à fibre à dispersion normale. Nous montrons notamment que si l'enveloppe de l'impulsion reste correctement décrite par l'expression analytique d'un similariton parabolique, des structures sombres peuvent néanmoins se superposer à cette enveloppe.

[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics][PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics][ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]Optique non-linéaireauto-similaritéamplificateur à fibre
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Statistiques extrêmes dans les amplificateurs Raman fibrés

2010

National audience; Nous étudions expérimentalement et analytiquement l'influence des effets de déplétion de la pompe sur la statistique extrême dans un amplificateur Raman fibré. Nous soulignons également l'impact de la dispersion de la fibre.

[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics][PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics][ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]StatistiquesAmplificateur à fibreEvénements extrêmes
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Impact of structural irregularities on high-bite-rate pulse compression techniques in photonics crystal fibre

2008

International audience; The impact of structural irregularities on high bit rate pulse compression techniques is evaluated in photonic crystal fibre. Specifically, more robust pulse compression to longitudinal fluctuations in the normal dispersion regime is reported. The physical limits of these pulse compression techniques in the presence of dispersion fluctuations are identified and the fact that state-of-the-art fabrication tolerances are sufficient for future experimental applications is confirmed.

[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]FabricationMaterials scienceOptical fiber[ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]business.industry02 engineering and technology01 natural sciencesPhotonic crystal fibrelaw.invention010309 optics020210 optoelectronics & photonicsOpticsPulse compressionlaw0103 physical sciencesDispersion (optics)Bit rate0202 electrical engineering electronic engineering information engineeringIntegrated opticsElectrical and Electronic EngineeringbusinessPhotonic crystal
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Generation of parabolic pulses and applications for optical telecommunications

2009

International audience; Parabolic pulses in optical fibers have stimulated an increasing number of applications. We review here the physics underlying the generation of such self-similar pulses as well as the results obtained in a wide-range of passive or active experimental configurations.

[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]Materials scienceOptical fiber[ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]business.industryNonlinear optics02 engineering and technology01 natural sciencesOptical fibre amplifierslaw.invention010309 optics020210 optoelectronics & photonicsOpticsOptical fiber amplifierslaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringFiber amplifierOptoelectronicsbusiness
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