UDE , Michèle

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Rare earth (RE) doped silica-based optical fibers with transparent glass ceramic (TGC) core was fabricated through the well-known modified chemical vapor deposition (MCVD) process without going through the commonly used stage of post-ceramming. The main characteristics of the RE-doped oxyde nanoparticles, their density and mean diameter in the...

Optical fibres are mostly based on silica glass for its interesting properties (reliability, low cost, ...). However, some of its characteristics (high phonon energy, low solubility of luminescent ions, ...) induce drawbacks in spectroscopic properties of rare-earth (RE)-doped fibre lasers and amplifiers. Here we investigate the growing of...

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Séminaire donné au LphiA (Angers)

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Improving optical fiber amplifiers requires the elaboration and use of new materials and new compositions. In this sense, we prepared erbium-doped optical fiber samples that were co-doped with magnesium or lanthanum by gradual-time solution doping. Doping concentrations and thermal processes induce the formation of nanoparticles. The effect of...

At the Institut de Physique de Nice, the research activities of the Fibre Optics and Applications team and the technological expertise of its Specialty Optical Fibres manufacturing facility have a great potential as a facilitator for the community in non-linear and laser optics.

Les fibres optiques céramiques permettent de combiner les propriétés mécaniques d'un matériau amorphe et les propriétés spectroscopiques d'un environnement qui peut être cristallin ou amorphe. Dans cette communication, nous présentons une méthode de nanostructuration de fibres optiques à base de silice où l'introduction de magnésium dans la...

The presence of scatterers, for long, had been considered detrimental for the growth of photonic devices. Hence, a great care is taken during the fabrication of fibers and optical devices to avoid scatterers, which may lead to a loss of signal strength and efficiency of the device. However, random scatterers have become a topic of immense...

A large mode area single-mode optical fibre based on leaky mode filtering was prepared by MCVD. The cladding structure discriminates the fundamental mode from the higher order ones. A preliminary version has 25-µm core diameter and 0.11 numerical aperture. A Gaussian-like mode with 22-µm MFD is observed after 3-m propagation, in agreement with modeling.

Standard MCVD process and solution doping are commonly used for processing rare-earth doped optical fibers. Since the 1970s, this technique is mainly employed to fabricate homogeneous preforms in the longitudinal direction. A variant is proposed here, by using two doping solutions and by applying a gradual time doping. To demonstrate the...

Le développement de nouvelles fibres optiques amplificatrices nécessite de s'affranchir des limitations spectroscopiques imposées par la silice. Pour cela, nous avons choisi d'encapsuler les ions luminescents dans des nano-particules d'oxyde. Elles sont obtenues par séparation de phase déclenchée par des cycles thermiques nécessaires a la...

Thulium-doped optical fibre amplifiers (TDFA) are developed to extend the optical telecommunication wavelength division multiplexing (WDM) bandwidth in the so-called S-band (1460-1530 nm). The radiative transition at 1.47 lm (3H4 -> 3F4) competes with a non-radiative multi-phonon de-excitation (3H4 -> 3H5). The quantum efficiency of the...

Thulium-doped optical fibre amplifiers (TDFA) are developed to extend the optical telecommunication wavelength division multiplexing (WDM) bandwidth in the so-called S-band (1460–1530 nm). The radiative transition at 1.47 µm (3H4 - 3F4) competes with a non-radiative multi-phonon de-excitation (3H4 -3H5). The quantum efficiency of the transition...

We demonstrate the use of a dysprosium-doped silica fiber saturable absorber in a passively Q-switched erbium-doped fluoride fiber laser operating at 2.8 µm.

DNP are observed in fibres when alkaline-earth elements (Mg, Ca and Sr) are incorporated. Mean size of the DNP, deduced from SEM pictures, depends on the composition... This last composition leads to a low loss fibre... From EDX measurements, we have observed that alkaline-earth elements and erbium ions are located inside or very close to the...

Thulium-doped optical fibre amplifiers (TDFA) are developed to extend the optical telecommunication wavelength division multiplexing (WDM) bandwidth in the so-called S-band (1460-1530 nm). The radiative transition at 1.47 lm (3H4 -> 3F4) competes with a non-radiative multi-phonon de-excitation (3H4 -> 3H5). The quantum efficiency of the...

A fiber made by Furnace CVD was codoped with Erbium and Magnesium using a Flash Vaporization System for the first time. The fiber core is spontaneously formed as a Transparent Glass Ceramic (TGC). Due to the small nanoparticle size (<50 nm) and high volumetric density (10 20 ~10 21 m-3), the optical loss due to scattering is as low as < 0,6...

Une fibre en silice dopée à l'erbium et au magnésium a été fabriquée pour la première fois par FCVD et dopée par une méthode de « vaporisation flash ». Le coeur de la fibre contient des nanoparticules de taille < 50 nm, avec une densité volumique de 10 20 à 10 21 m -3 . Les pertes de fond sont inférieures à 0,6 dB/m. Nous étudions les...