Abstract:
A method for manufacturing an optical fiber and the resulting article. The method including the steps of: providing a substrate tube; depositing high purity silica-based cladding layers on the inside of the tube; depositing a germanium-free core comprising a glass including silica, and oxides of Al, La, Er, and Tm; collapsing the substrate tube to form a preform; and drawing the preform to yield an optical fiber. A germanium-free co-doped silicate optical waveguide in accordance with the present invention includes a core material comprising silica, aluminum, lanthanum, erbium and thulium, wherein the concentration of Er is from 15 ppm to 3000 ppm; Al is from 0.5 mol% to 15 mol%; La is less than 2 mol%; and Tm is from 150 ppm to 10000 ppm. In an exemplary specific embodiment the concentration of Al is from 4 mol% to 10 mol%; and the concentration of Tm is from 150 ppm to 3000 ppm. The core may further include F. In an exemplary embodiment, the concentration of F is less than or equal to 6 mol%. The waveguide may be an optical fiber, a shaped fiber or other light-guiding waveguides. An amplifier according to the present invention includes the optical fiber described above.
Abstract:
An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a halide-doped silicate glass that comprises approximately the following in cation-plus-halide mole percent 0.25-5 mol% Al 2 O 3 , 0.05-1.5 mol% La 2 O 3 , 0.0005-0.75 mol% Er 2 O 3 , 0.5-6 mol% F, 0-1 mol% Cl.
Abstract translation:一种包括芯的光学制品; 至少一层包层; 以及在芯和包层之间的窄氟储存器。 氟储存器具有比包覆层或芯层更高的氟浓度。 一个具体实施方案包括包含卤化物掺杂的硅酸盐玻璃的核,其在阳离子加 - 卤化物摩尔百分比为0.25-5摩尔%Al 2 O 3,0.05-1.5摩尔%La 2 O 3,0.0005-0.75摩尔%Er 2 O 3,0.5-6 mol%F,0-1mol%Cl。
Abstract:
An optically active phosphorus-silicate glass when pumped to directly excite Er ions provides gain in 1565nm to 1620nm range and comprises in weight percent: SiO2 50 to 92%; Er2O3 0.01 to 2%; P2O5 greater than 5%; and Al2O3 0.0 to 0.3%.
Abstract:
A light amplifying optical fiber capable of restricting a reduction in amplifying efficiency and non-linearity caused by the concentration quenching of erbium ions. At least one of rare earth elements, having an ion radius at least 70% and up to 130% of that of erbium and excluding erbium, for example, Yb, is added to the core portion of an erbium-ion-added light amplifying optical fiber.
Abstract:
A sol-gel method of preparing a powder for use in forming a glass is provided, along with methods of preparing glasses and glass fibers from the powder. The inventive method allows for the incorporation of a wide range of elements and compositions into a homogeneous glass or glass fiber that is substantially free of hydroxide groups. In addition, dopants incorporated into glasses prepared by the inventive method are uniformly distributed throughout the glass structure.
Abstract:
L'invention se rapporte à un guide d'onde optique, en particulier une fibre optique comprenant un coeur, formé d'un matériau à base de silice dopé avec des ions de terres rares, recouvert d'une gaine optique. Des nanoparticules, dont au moins une partie est en métal, sont dispersées dans le matériau, du coeur. Des dispositifs optiques, tels que notamment des amplificateurs optiques, comportent une fibre optique comprenant unit coeur formé d'un matériau à base de silice dopé avec des ions de terres rares recouvert d'une gaine optique, des nanoparticules, dont au moins une partie est en métal, étant dispersée dans le matériau du coeur, et une source de pompage délivrant un rayonnement électromagnétique d'excitation se propageant dans le coeur.
Abstract:
La présente invention concerne un guide optique (100) comportant un milieu amplificateur comprenant :
un coeur (10) en une matrice principale d'un matériau transparent, la matrice principale contenant des particules (1, 2), chaque particule étant formée d'une matrice submicronique distincte de la matrice principale et dopée par un élément actif métallique, une gaine guidante externe (11) en contact avec le coeur (10). La taille des particules (1, 2) est inférieure à 20 nm. La présente invention concerne aussi un procédé de fabrication d'un tel guide.
Abstract:
In an optical communication and the like, a light amplifying optical fiber is capable of amplifying an optical signal having a wavelength in the vicinity of at least 1.57 to 1.62 µm by a high gain. A cladding (5) is formed on the side of an outer peripheral portion of a core (1) to which erbium is added, and a refractive index of the cladding is smaller than that of the core (1). A relative refractive index difference "Δ" of the core (1) with respect to the cladding (5) is made equal to 0.3 % or larger, and also equal to 1 % or smaller. While a composition of the core (1) is made of Er-Al 2 O 3 -GeO 2 -SiO 2 , a composition of the cladding (5) is made of SiO 2 , erbium is added to the entire region of the core, and concentration of this erbium is selected to be 1,000 wtppm, and also a cut-off wavelength of the optical fiber is selected to be 1,400 nm. While the cut-off wavelength of the optical fiber is made constant, since the relative refractive index difference "Δ" is selected to be an optimum value, a diameter of the core may become an optimum value. Lowering of the gain caused by a bending loss of the optical fiber can be avoided, and an erbium absorption amount per unit length of the optical fiber can be increased, and further, a gain per unit length of the optical fiber can be increased
Abstract:
A quartz glass doped with rare earth element, aluminium and further fluorine, and endowed with various characteristics such as practicable luminescent properties, high amplification gain, achievement of wider band, size reduction of elements, fusibility and connectivity of quartz glasses with each other, and so forth. This glass is not accompanied with crystallization inherent in this type of doped quartz glass in the course of its producton, so that it is transparent of course and contains no residual bubbles. Since the production process comprises a combination of a technique for forming a porous glass with a method of solution impregnation, it is possible to produce readily a quartz glass doped with both rare earth element and aluminum, having high purity and excellent transparency, and being useful as an active optical element.
Abstract:
An amplifier optical fiber comprising a central core of a dielectric matrix doped with at least one element ensuring the amplification of an optical signal transmitted in the fiber and a cladding surrounding the central core and suitable for confining the optical signal transmitted in the core. The fiber also comprises metallic nanostructures suitable for generating an electronic surface resonance in the dielectric matrix of central core, the wavelength of said electronic surface resonance corresponding to an excitation level of the element ensuring the amplification. Such a fiber can constitute an amplifier fiber, a laser or an optical sensor.