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Formation of microstructured fiber preforms using porous glass deposition

An optical fiber preform and microstructure technology, applied in glass fiber products, glass manufacturing equipment, applications, etc., can solve the problems of uncontrollable position and size, easy to change and so on

Inactive Publication Date: 2011-05-11
OFS FITEL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Disadvantages associated with these methods include that the location and size of the holes inside the cladding are so uncontrollable that the effective refractive index of the cladding varies too readily as a function of preform or fiber position

Method used

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  • Formation of microstructured fiber preforms using porous glass deposition
  • Formation of microstructured fiber preforms using porous glass deposition
  • Formation of microstructured fiber preforms using porous glass deposition

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Embodiment Construction

[0018] It has been found that a porous material can be deposited onto an optical fiber preform substrate to form gas bubbles that are part of the preform structure. By incorporating gas bubbles into a layer of the preform structure (e.g., as an annular layer in the cladding structure), the effective refractive index of that layer can be easily changed, which is the key to controlling the refractive index profile of optical fibers drawn from the preform. useful tool. According to the invention, a powder with particles of controlled size, such as silicon oxide powder, is deposited on the outer surface of the preform substrate by means of a plasma process. The desired size and density of the bubbles are effectively controlled by selecting appropriate deposition conditions such as but not limited to: (1) rotation of the preform substrate relative to the plasma source and translational motion; (2) maintain the temperature at a value near the fiber drawing temperature; and (3) the ...

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Abstract

A method of making a microstructured optical fiber preform uses the plasma fusion of a powder layer deposited onto a substrate under conditions that prevent the deposited layer from completely densifying, thereby yielding the formation of bubbles within the layer. By systematic control of powder melt and delivery, while maintaining the process temperature below a temperature associated with densifying the deposited layer, the powder particles densify only partially on the substrate and create bubbles of a fairly narrow (and thus controllable) diameter range within a defined region of the preform. Upon drawing a fiber from the preform, the bubbles will extend into gas lines, forming a desired microstructure arrangement.

Description

technical field [0001] The present invention relates to the formation of microstructured optical fiber preforms and, more particularly, to the powder layer deposited on the outer surface of an optical fiber substrate by applying plasma fusion to the deposited layer under defined conditions that prevent complete hardening of the layer, whereby the Bubbles are formed within the layer to create a microstructure alignment to form a microstructure fiber preform. Background technique [0002] Microstructured optical fibers (also known as "holey fibers") have many potential applications. The introduction of air-filled (and more generally gas-filled) pores in a solid glass lowers the effective refractive index of the glass and / or creates a band gap that affects light propagation. Therefore, these "porous" glass materials can be used as claddings for optical fibers. Various methods of preparing such optical fibers are known. Most rely on the systematic assembly and drawing of stac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018
CPCC03B37/01242C03B37/01291C03B2203/14C03B2203/42
Inventor 詹姆斯·弗莱明乔治·齐德齐克
Owner OFS FITEL LLC
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