Abstract:
Microstructured optical fibre is fabricated using extrusion. The main design of optical fibre has a core suspended in an outer wall by a plurality of struts. A specially designed extruder die is used which comprises a central feed channel, flow diversion channels arranged to divert material radially outwards into a welding chamber formed within the die, a core forming conduit arranged to receive material by direct onward passage from the central feed channel, and a nozzle having an outer part in flow communication with the welding chamber and an inner part in flow communication with the core forming conduit, to respectively define an outer wall and core of the preform. With this design a relatively thick outer wall can be combined with thin struts (to ensure extinction of the optical mode field) and a core of any desired diameter or other thickness dimension in the case of non-circular cores. As well as glass, the extrusion process is suitable for use with polymers. The microstructured optical fibre is considered to have many potential device applications, in particular for non-linear devices, lasers and amplifiers.
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:
A method of making a phosphosilicate fiber comprises the steps of: (i) manufacturing a preform containing phosphorus doped silica; and (ii) drawing phosphosilicate fiber from said preform at a temperature at 1700°C to 1900°C.
Abstract:
A method and apparatus (20) for manufacturing optical components. A burner (24) generates soot (22), and a surface area collector (26) collects the soot (22). The burner (24) is disposed such that the soot (22) collected within the surface area collector (26) is substantially not reheated by subsequently deposited soot (22). Magnetic forces (50) direct the soot to desired location(s) within the surface area collector (26). The surface area collector (26) operates at relatively low temperatures sufficient to retain rather volatile substances, such as fluorine, in the soot (22).
Abstract:
A method of manufacturing an optical fiber preform and optical fiber therefrom. The method involves providing a soot clad region of the preform with a dopant, such as P2O5, that causes sintering of the preform to progress from the inside of the soot clad region to its outside, i.e., "inside-out" sequence as opposed to the prior art "outside-in." This beneficially allows outgassing to occur in a radial direction which reduces defects and desirably allows the use of axial bulk sintering. In one embodiment, the dopant varies linearly as a function of radial dimension. Preferable amounts of the viscosity lowering dopant are about 0.1 weight % or greater per centimeter of soot in the soot clad region.
Abstract translation:从其制造光纤预制件和光纤的方法。 该方法包括用诸如P 2 O 5的掺杂剂提供预成型体的烟灰包覆区域,其使得预成型体烧结从烟灰包覆区域的内部进入其外部,即“内向外”序列,而不是 现有技术“外在”。 这有利地允许放气沿径向发生,从而减少缺陷,并期望允许使用轴向体积烧结。 在一个实施方案中,掺杂剂作为径向尺寸的函数线性变化。 在烟灰包覆区域中,优选的粘度降低掺杂剂的量为约0.1重量%或更大每厘米的烟灰。
Abstract:
An optical fiber for optical amplifying, provided with a structure for implementing flat gain characteristics or oscillation characteristics in wider wavelength bands, and a production method therefor. The optical fiber for optical amplifying is provided with a second dope region containing an optical axis center-containing first dope region and having an outer diameter larger than that of the first dope region. At least any one of Al2O3, P2O5, Y2O3 and B2O3 are added into the second dope region as oxides of elements having valences different from those of cations constituting the main materials of the above optical fiber. At least any of Er, Nd, Tm, Yb, Pr as rare earth elements, in addition to the above oxides, are added into the first dope region.
Abstract translation:一种用于光放大的光纤,其具有用于实现较宽波长带中的平坦增益特性或振荡特性的结构及其制造方法。 用于光放大的光纤设置有包含含光轴中心的第一掺杂区域并具有大于第一掺杂区域的外径的第二掺杂区域。 Al 2 O 3,P 2 O 5,Y 2 O 3和B 2 O 3中的至少任一种作为具有不同于构成上述光纤的主要材料的阳离子的元素的氧化物而添加到第二掺杂区域中。 除了上述氧化物之外,稀土元素中的Er,Nd,Tm,Yb,Pr中的至少任意一种被添加到第一掺杂区域中。
Abstract:
Suppression of stimulated Brillouin scattering (SBS) by broadening the energy spectrum of participating SBS photons and/or phonons is achieved in an optical fiber having a core with both radially nonuniform viscosity and CTE profiles provided by alternating layers of glass modifying dopants such as phosphorus and fluorine. The nonuniform thermal expansion and viscosity profiles impart a residual, permanent, nonuniform stress in the fiber. The SBS suppressing effect provided by the nonuniform stress can be controlled and enhanced by applying a uniform or nonuniform tensile force to the fiber as it is being drawn. A preform for the fiber is also disclosed.
Abstract in simplified Chinese:一种制造光学组件之方法以及设备。燃烧器产生粉尘,以及表面积收集器收集粉尘。燃烧器放置将使得收集于表面积收集器内之粉尘并不会受到后续沉积粉尘再加热。磁力导引表面积收集器内粉尘至所需要之位置。表面积收集器操作于相当低温度足以保持相当挥发性物质例如氟于粉尘中。