Abstract:
A preform (1) is inserted into an oven (3). High-pressure hot fluid causes the end (2) of the fiber to deform and flow out of a nozzle (5). The emitted glass is in the form of a fiber (6).
Abstract:
The present invention is directed to a method and apparatus for forming soot used in making glass, and in particular, optical waveguides. A liquid precursor (66) is first fed into orifice (52) of a liquid orifice insert (48) within an injector (44) positioned within an atomizing burner assembly, and is thereafter discharged from the injector into a pressurization chamber (56). An atomization gas (70) is also fed into the pressurization chamber (56) to mix with the liquid precursor liquid stream (68) which breaks into droplets (76). The liquid precursor and atomization gas are forced under pressure out of an atomization orifice (32) on the face of the burner (30) assembly. Flame gas (74), reaction gas (84) and shield gas (82) are ejected from burner orifices (40, 38, 36 and 34) to produce the flame. The atomized liquid precursor thus discharged is fed into the flame (72) produced at the face of the burner assembly where the atomized liquid precursor reacts with the flame to form soot (78) on a rotating mandrel (80).
Abstract:
The present disclosure provides optical fiber preforms formed from core canes having large core-clad ratio, intermediate core-cladding assemblies, and methods for making the preforms and core cladding assemblies. The preforms are made with capped core canes. The capping material has a coefficient of thermal expansion less than the coefficient of thermal expansion of the core cane and more closely matched to or lower than the coefficient of thermal expansion of the surrounding cladding monolith in a cane-in-soot process. Presence of the cap reduces stresses that arise from differential thermal expansion of the core cane and cladding materials and leads to preforms having low defect concentration and low probability of failure during subsequent thermal processing steps.
Abstract:
La présente invention concerne un procède de fabrication d'une fibre optique (18) comprenant les étapes suivantes - on réalise une préforme (10) contenant des nanoparticules munies d'un élément actif comprenant au moins un évidemment (14) au voisinage d'une partie au moins des nanoparticules, - on effectue le fibrage de la préforme (10) en introduisant un gaz (11) non-oxydant dans l'évidemment (14), limitant ainsi les risques d'oxydations des nonoporticules de la préforme (10). La préforme (10) destinée à là fabrication d'une fibre optique (18) par le procédé selon l'invention comprend des nanoparticules munies d'un élément actif dans une zone dopée (12) et au moins un évidement (14) au voisinage de la zone dopée (12).
Abstract:
The present invention is directed to a method for making silica. A liquid siloxane-containing feedstock capable of being converted by thermal oxidative decomposition to SiO2 is provied and introduced directly into the flame of a combustion burner, which converts the compound to silica, thereby forming finely divided amorphous soot. The soot is vaporized at the conversion and/or deposition site where the liquid is converted into silica by atomizing the liquid with a stream of oxygen gas, or a mixture of oxygen gas and other gas, such as nitrogen. The amorphous soot is deposited on a receptor surface where, either substantially simultaneously with or subsequently to its deposition, the soot is consolidated into a body of fused silica glass, such as an optical fiber preform.
Abstract:
Process for eliminating the axial refractive-index depression in optical fibres, obtained by the MCVD process, consisting in generating a pressure of dopant when in vapour state, equal to the vapour pressure of the dopant itself, inside the preform, during the collapsing state.