Methods for producing a hollow-core fiber and for producing a preform for a hollow-core fiber
A technology of hollow-core optical fiber and prefabricated parts, which is applied in the direction of manufacturing tools, glass manufacturing equipment, glass fiber products, etc., and can solve the problems that structural accuracy cannot be easily achieved
Pending Publication Date: 2022-02-08
HERAEUS QUARZGLAS
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Problems solved by technology
[0037] In addition, the disadvantages of the traditional "stack-drawing" technique, that the required structural precision cannot be easily achieved, especially the uniform wall thickness of the anti-resonance element and the precise positioning of the predetermined azimuthal position, should be avoided as much as possible
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[0106] The invention is explained in more detail below with the aid of examples and figures. Among them, in the diagram:
[0107] figure 1 A primary preform with a cladding tube and an anti-resonant element preform positioned and fastened therein for the production of a hollow-core optical fiber preform is shown with the aid of a cross-sectional view.
[0108] When manufacturing hollow-core optical fibers or hollow-core optical fiber preforms, several components must be joined to each other. Also, when performing the thermoforming process, it can be helpful to seal existing gaps or channels in the preform. As disclosed in DE 10 2004 054 392 A1, for bonding or sealing, use SiO-containing 2 sealing or bonding materials. Among them, by wet grinding quartz glass particles, made of SiO 2 Aqueous slurry of amorphous particles with a particle size distribution characterized by a D of about 5 μm 50 value and a D of about 23µm 90 value. Other SiO with an average grain size of ...
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Abstract
Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and further processing the primary preform in order to form a secondary preform, including a process of elongating the primary preform in order to directly form the hollow-core fiber or to form the secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved in that a primary preform with an outer diameter ranging from 20 to 70 mm is used for the elongation process.
Description
technical field [0001] The present invention relates to a method of manufacturing an anti-resonant hollow-core fiber having a hollow core extending along the longitudinal axis of the fiber and a cladding region surrounding the hollow core, the cladding region comprising several anti-resonant resonant element, the method comprising the steps of: [0002] (a) providing a clad tube having a clad tube bore and a clad tube longitudinal axis, a clad tube wall defined by an inner surface and an outer surface extending along the clad tube longitudinal axis, [0003] (b) providing several tubular anti-resonant element preforms, [0004] (c) disposing said anti-resonant element preform at prescribed locations on said inner surface of said clad tube wall to form a primary preform having a hollow core region and an inner cladding region, [0005] (d) reprocessing said primary preform into a secondary preform from which said hollow core optical fiber is drawn, wherein said reprocessing i...
Claims
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IPC IPC(8): C03B37/012C03B37/027
CPCC03B37/0124C03B37/0122C03B37/02781C03B2203/16C03B2203/14C03B2203/42C03B2201/12C03B37/01245C03B37/01262C03B2201/02G02B6/02328G02B6/032
Inventor M·罗森伯格M·特罗默尔S·魏曼M·胡乃曼K·舒斯特
Owner HERAEUS QUARZGLAS