摘要:
An optical fiber preform producing method is a method for producing an optical fiber preform including a core part and a cladding part and being composed of silica-based glass, which has: an alkali metal adding step of adding an alkali metal in a maximum concentration of not less than 500 ppm in the vicinity of an inner surface of a glass pipe composed of silica glass; an etching step of etching the inner surface of the glass pipe by vapor phase etching under flow of SF 6 gas and chlorine gas through an inner hollow of the glass pipe, after the alkali metal adding step; and a collapsing step of eliminating the hollow of the glass pipe to produce a glass rod, after the etching step, wherein the optical fiber preform is produced using the glass rod produced by the collapsing step.
摘要:
A preform manufacturing method of the present invention has a hole forming step of forming a plurality of holes in a glass body to produce a glass pipe, and a heating integration step of heating the glass pipe with core rods including core portions being inserted in the respective holes, thereby to implement integration of the core rods and the glass pipe. In the hole forming step, a peripheral hole out of the holes to be formed in the glass body is formed at a position determined in consideration of positional variation of the core portion before and after the integration.
摘要:
A glass rod (2) for a core or for the core and a cladding is inserted into a glass pipe (1) for the cladding and heated by a heater (3) while the pressure inside the glass pipe (1) is reduced. The feed rate V R of the glass rod is adjusted such that it is faster than the feed rate V P of the glass pipe and not more than twice the feed rate of the pipe; both being fed into a heating furnace where the rod and pipe are integrated and elongated.
摘要:
The disclosed method of making a mixed glass optical fiber exemplarily comprises providing a high-silica tube, and causing molten non-high silica glass to flow into the bore (12) of the tube by application of a pressure differential. In order to prevent cracking, the tube desirably has an outer diameter/inner diameter ratio of at least 5, preferably about 10 or even more, and an inner diameter of at most 1 mm. In a preferred embodiment, a conventional SiO 2 tube is partially collapsed to an inner diameter less than 1 mm, a quantity of a non-high-silica glass is placed in a neck of the partially collapsed tube and heated such that molten glass communicates with the reduced-diameter portion of the bore and can be drawn into the reduced-diameter portion by means of a vacuum. The resulting mixed glass body is then further stretched to result in a core rod of core diameter at most 0.3 mm. After overcladding the core rod with SiO 2 , fiber is drawn from the thus produced preform. A thus produced fiber with SiO 2 cladding and SiO 2 -Al 2 O 3 -La 2 O 3 -Er 2 O 3 core was used as an optical fiber amplifier and provided high gain.
摘要翻译:所公开的制造混合玻璃光纤的方法示例性地包括提供高硅石管,并且通过施加压差使得熔融的非高硅石玻璃流入管的孔(12)。 为了防止破裂,管理想地具有至少5,优选地约10或甚至更多的外径/内径比,以及至多1mm的内径。 在一个优选的实施方案中,常规的SiO2管部分塌陷至小于1mm的内径,将一定量的非高硅石玻璃置于部分塌陷的管的颈部并加热,使得熔融玻璃与 直径减小的部分并且可以通过真空吸入缩径部分。 然后将得到的混合玻璃体进一步拉伸以得到芯直径至多0.3mm的芯棒。 在用SiO 2包覆芯棒之后,从如此制造的预制棒中拉出纤维。 使用这样制造的具有SiO 2包层和SiO 2 -Al 2 O 3 -La 2 O 3 -Er 2 O 3芯的光纤作为光纤放大器并提供高增益。
摘要:
Die Herstellung von Substratrohren aus Quarzglas umfasst typischerweise einen Verfahrensschritt, bei dem ein einen Außendurchmesser C a , einen Innendurchmesser C i und eine Innenbohrung aufweisender Quarzglas-Hohlzylinder kontinuierlich in einer Heizzone bereichsweise erweicht und zu einem Rohrstrang mit einem Außendurchmesser T a und einem Innendurchmesser T i abgezogen wird. Durch Ablängen des Rohrstrangs werden Substratrohre der gewünschten Länge erhalten. Sie dienen als Halbzeug bei der Herstellung von Vorformen für optische Fasern. Das werkzeugfreie Umformen des Ausgangs-Hohlzylinders bereitet Probleme bei der Einhaltung der nominalen radialen Abmessungen des Rohrstrangs und der Rotationssymmetrie. Insbesondere bei starken Verformungsgraden werden Durchmesserschwankungen sowie Ovalitäten und Wandeinseitigkeiten beobachtet. Um eine kostengünstige Herstellung von Substratrohren mit hoher Maßhaltigkeit und Oberflächenqualität zu gewährleiten, schlägt die Erfindung eine Modifikation des bekannten Verfahrens vor, bei dem für Hohlzylinder und Rohrstrang gelten: C a > 180 mm, C r > 3 mit C r = C a /C i , T r r = T a /T i und C i /T i
摘要翻译:制造石英玻璃的基板的方法包括向加热区连续供给石英玻璃的中空圆筒,在加热区域中逐个地软化中空圆柱体,从软化部分抽出管状的线材。 中空圆筒具有外径Ca,内径Ci和内孔。 管状股具有外径Ta和内径Ti。 以下参数适用于中空圆筒和管状钢管:Ca> 180 mm,Cr> 3,Cr = Ca / Ci,Tr <1.6,Tr = Ta / Ti和Ci / Ti <2.5。 内孔中的吹气压力被调节到4至10毫巴范围内的值。 通过将管状线材切割成所需长度而获得的基材管用作用于制造光纤预成型件的半成品。
摘要:
The present invention relates to a method and to a device for sheathing a solid-state laser medium comprising an active solid-state core material coated with a sheath. According to the method of the invention: a) the core material, made in the form of an elongate bar along a fibre axis, is at least partially introduced into a capillary tube; b) a laser beam is focused onto an annular focusing zone of the capillary tube until said tube around the core material melts in said focusing zone but without melting said core material; and c) when the molten capillary material adheres to the core material, said core material and/or said capillary tube are moved in a direction collinear with the axis of the core.
摘要:
An object of the present invention is, to provide a quartz glass tube (1) for use as the preform for optical fibers or an auxiliary quartz glass tube (1) to be connected to the tube for a preform for optical fibers, having a tapered groove (8) provided in the vicinity of the edge portion of the supporting sides thereof, and furthermore, the edge plane of the supporting side of the quartz glass tube is specular finished. The object is also accomplished by a method of producing a preform for optical fibers using the same tube (1) with tapered groove (8) and inserting a core glass rod (2) therein followed by heating to form a monolithic preform.
摘要:
The invention is a method of making an optical fiber or cane (600) that has optical properties that vary axially. Core glass (100) and clad glass (200) are fed into a furnace to form the cane or fiber. The velocities of the feeding of the clad and core are controlled so that the total combined mass per unit time is constant. The diameter of the core (604) varies along the length of the fiber or cane in accordance with the control of the velocities. The variance in the core diameter results in the variance of the axial optical properties of the fiber or cane.