Abstract:
A sol-gel process for producing dry porous gel monoliths, e.g., silica glass monoliths, in which the successive process steps of gelling, aging and drying all occur within a mold formed of a porous material, e.g., graphite. The mold is inert to the gel solution and it has sufficient strength to withstand the temperatures and pressures encountered during the process, yet it has sufficient porosity to facilitate the escape of liquid from the gel pores directly through the mold, itself. The mold and gel thereby can remain within a sealed autoclave during these process steps, and mechanical handling of the mold and the gel are minimized. This substantially enhances the process' efficiency. Alternatively, the mold can have a non-porous inner skin.
Abstract:
L'invention se rapporte à un guide d'onde optique, en particulier une fibre optique comprenant un cœur, formé d'un matériau à base de silice dopé avec des ions de terres rares, recouvert d'une gaine optique. Des nanoparticuies, dont au moins une partie est en métal, sont dispersées dans le matériau du cœur, Des dispositifs optiques, tels que notamment des amplificateurs optiques≥ comportent une fibre optique comprenant un cœur forméd'un matériau à base de silice dopé avec des ions de terres rares recouvert d'une gaine optique, des nanoparticules, dont au moins une parue est en meta!, étant dispersée dans le matériau du cœur, et une source de pompage délivrant un rayonnement électromagnétique d'excitation se propageant dans le cœur.
Abstract:
The invention relates to an optical fibre comprising a gain medium which is equipped with: a core (22) which is formed from a transparent material and nanoparticles (24) comprising a doping element and at least one element for enhancing the use of said doping element; and an outer sheath (26) which surrounds the core. The invention is characterised in that the doping element is erbium (Er) and in that the enhancing element is selected from among antimony (Sb), bismuth (Bi) and a combination of antimony (Sb) and bismuth (Bi). According to the invention, one such fibre is characterised in that the size of the nanoparticles is variable and included between 1 and 500 nanometers and preferably greater than 20 nm.
Abstract:
A method for manufacturing an optical fiber, the method including the steps of providing a substrate tube; depositing a boron-free cladding layer; depositing a core comprising a glass including silica, and oxides of Al, Ge, Er, and Tm; collapsing the substrate tube to form a preform; and drawing the preform to yield optical fiber. A co-doped silicate optical waveguide having a core including silica, aluminum, germanium, erbium and thulium. The composition concentrations are: Er from 15 ppm to 3000 ppm; Al from 0.5 mol% to 12 mol%; Tm from 15 ppm to 10000 ppm; and Ge from 1 mol% to 20 mol%. In a specific embodiment, the concentration of Er is from 150 ppm to 1500 ppm; Al is from 2 mol% to 8 mol%; and Tm is from 15 ppm to 3000 ppm.
Abstract:
An optical waveguide including a core having silica, Al, a non-fluorescent rare-earth ion, Ge, Er, and Tm. The non-fluorescent rare-earth ion may be La. Exemplary compositions concentrations are Er is from 15 ppm to 3000 ppm, Al is from 0.5 mol% to 12 mol%, La is less than or equal to 2 mol%, Tm is from 15 ppm to 10,000 ppm; and the Ge is less than or equal to 15 mol%. The core may further include F. An exemplary concentration of F is less than or equal to 6 anion mol%.
Abstract:
Process for preparing a silicon dioxide granule having a specific surface area of less than 1 m 2 /g and a proportion of impurities of less than 50 ppm, in which a) a silicon dioxide powder with a tamped density of 15 to 190 g/l, b) is compacted to slugs which are subsequently crushed, the slug fragments having a tamped density of 210 to 800 g/l, and c) the slug fragments are treated with one or more reactive compounds at 400 to 1100 °C.
Abstract:
A method for manufacturing an optical fiber, the method including the steps of providing a substrate tube; depositing a boron-free cladding layer; depositing a core comprising a glass including silica, and oxides of Al, Ge, Er, and Tm; collapsing the substrate tube to form a preform; and drawing the preform to yield optical fiber. A co-doped silicate optical waveguide having a core including silica, aluminum, germanium, erbium and thulium. The composition concentrations are: Er from 15 ppm to 3000 ppm; Al from 0.5 mol% to 12 mol%; Tm from 15 ppm to 10000 ppm; and Ge from 1 mol% to 20 mol%. In a specific embodiment, the concentration of Er is from 150 ppm to 1500 ppm; Al is from 2 mol% to 8 mol%; and Tm is from 15 ppm to 3000 ppm.
Abstract:
An optical fiber for optical amplifying, capable of amplifying optical signals at least in the vicinity of wavelengths of 1.57 to 1.62 mu m with a high gain in optical communication or the like. A clad (5) lower in refractive index than a core (1) is formed on the outer peripheral side of the erbium-added core (1), with the relative refractive index difference DELTA of the core (1) with respect to the clad (5) set to at least 0.3% and up to 1%. The core has a composition Er-Al2O3-GeO2-SiO2, and the clad has a composition SiO2, with erbium added to the entire region of the core at a concentration of 1000 wtppm and with the cutoff wavelength of the optical fiber set to 1400 nm. A constant cutoff wavelength of the optical fiber and an optimized relative refractive index difference DELTA can optimize a core diameter, avoid a reduction in gain due to an optical fiber bending loss, and increase a gain per optical fiber unit length by increasing an erbium absorption amount per optical fiber unit length.
Abstract:
A sol-gel process for producing dry porous metal oxide monoliths, e.g., silica glass monoliths, in which the successive process steps of gelling, aging and drying all occur within a mold formed of a porous non-organic-polymer material, e.g., graphite. The mold is inert to the gel solution and has sufficient strength to withstand the temperatures and pressures encountered during the process. The mold and gel thereby can remain within a sealed autoclave during these process steps, and mechanical handling of the mold and the gel are minimized. This substantially enhances the process' efficiency. Alternatively, the mold can have a non-porous inner skin to enhance ease of cleaning of the mold, and of removal of the gel.
Abstract:
PROBLEM TO BE SOLVED: To provide a Yb-doped optical fiber having low transmission loss, high photo darkening resistance or low PD loss increase, and high conversion efficiency.SOLUTION: In a silica glass optical fiber including a core doped with a rare earth element and at least P and a cladding provided on an outer periphery of the core, the core NA is 0.05 or more and 0.25 or less, the concentration of the rare earth element doped in the core is 2 wt.% or more and 10 wt.% or less, the concentration of P doped in the core is 3 wt.% or more and 20 wt.% or less, and the minimum transmission loss of the core in a wavelength band from 1,000 nm to 1,700 nm is 3 dB/km or more and 100 dB/km or less.
Abstract translation:要解决的问题:提供一种具有低传输损耗,高光变暗电阻或低PD损耗增加以及高转换效率的Yb掺杂光纤。解决方案:在包括掺杂有稀土元素的芯的石英玻璃光纤中 并且至少设置在芯的外周上的P和包层,芯NA为0.05以上且0.25以下,掺杂在芯中的稀土元素的浓度为2重量%以上且10重量%以下。 在芯中掺杂的P的浓度为3重量%以上且20重量%以下,核心在1000nm〜1700nm的波长带中的最小传输损耗为3dB / km 以上且100dB / km以下。