Optical fiber manufacturing method and optical fiber
US-9527765-B2 · Dec 27, 2016 · US
Method of making an optical fiber containing an alkali metal in the core
US9932265B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9932265-B2 |
| Application number | US-201615351782-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 15, 2016 |
| Priority date | Dec 12, 2012 |
| Publication date | Apr 3, 2018 |
| Grant date | Apr 3, 2018 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
There is provided a method for producing a low-loss alkali metal-doped silica core optical fiber having excellent hydrogen resistance. The method for producing the optical fiber according to the present invention includes a drawing step of drawing an optical fiber preform in a drawing furnace to produce a silica glass-based optical fiber including a core region containing an alkali metal with an average concentration of 0.5 atomic ppm or more and a cladding region that surrounds the core region and a heating step of heating the optical fiber in a heating furnace through which the optical fiber drawn from the drawing furnace passes.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing an optical fiber, comprising: a drawing step of drawing an optical fiber preform in a drawing furnace to produce a silica glass-based optical fiber including a core region containing an alkali metal with an average concentration of 0.5 atomic ppm or more and a cladding region that surrounds the core region; and a heating step of heating the optical fiber in a heating furnace through which the optical fiber drawn from the drawing furnace passes. 2. The method for producing an optical fiber according to claim 1 , wherein in the heating step, a temperature in the heating furnace is 700° C. or more. 3. The method for producing an optical fiber according to claim 1 , wherein in the heating step, a residence time of the optical fiber in the heating furnace is 0.2 seconds or more. 4. The method for producing an optical fiber according to claim 1 , wherein in the heating step, a product of a residence time of the optical fiber in the heating furnace and an average temperature in the heating furnace is 480 (s·° C.) or more. 5. The method for producing an optical fiber according to claim 1 , wherein a drawing speed in the drawing step is 150 m/min or more. 6. The method for producing an optical fiber according to claim 1 , wherein the alkali metal is potassium.
Assignees
Inventors
Classifications
containing alkali metals · CPC title
in a dopant containing atmosphere · CPC title
containing molecular hydrogen · CPC title
Silica-containing oxide glass compositions · CPC title
- C03C13/046Primary
Multicomponent glass compositions · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9932265B2 cover?
- There is provided a method for producing a low-loss alkali metal-doped silica core optical fiber having excellent hydrogen resistance. The method for producing the optical fiber according to the present invention includes a drawing step of drawing an optical fiber preform in a drawing furnace to produce a silica glass-based optical fiber including a core region containing an alkali metal with a…
- Who is the assignee on this patent?
- Sumitomo Electric Industries
- What technology area does this patent fall under?
- Primary CPC classification C03C13/046. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 03 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).