Optical fiber production method
US-2018290914-A1 · Oct 11, 2018 · US
Method for manufacturing optical fiber
US11091385B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11091385-B2 |
| Application number | US-201716329164-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 28, 2017 |
| Priority date | Aug 30, 2016 |
| Publication date | Aug 17, 2021 |
| Grant date | Aug 17, 2021 |
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Abstract
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A method for manufacturing an optical fiber includes: drawing an optical fiber from an optical fiber preform in a drawing furnace; and cooling the optical fiber in an annealing furnace. When the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less. The optical fiber is cooled for 0.01 seconds or more in the annealing furnace so that the temperature of the optical fiber becomes 1300° C. or more and 1800° C. or less.
First claim
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The invention claimed is: 1. A method for manufacturing an optical fiber comprising: drawing an optical fiber preform in a drawing furnace; and cooling the optical fiber drawn in an annealing furnace; wherein, when the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less, the optical fiber is cooled for 0.01 seconds or more in the annealing furnace so that the temperature of the optical fiber becomes 1300° C. or more and 1800° C. or less, and the temperature difference is higher than 60° C. and equal to 300° C. or less, and the temperature of the optical fiber is temporarily increased and then decreased in the annealing furnace. 2. The method for manufacturing an optical fiber according to claim 1 , wherein the optical fiber is cooled in the annealing furnace for 0.1 seconds or more. 3. The method for manufacturing an optical fiber according to claim 1 , wherein the optical fiber is cooled in the annealing furnace for 0.02 seconds or more so that the temperature of the optical fiber becomes 1450° C. or more and 1630° C. or less. 4. The method for manufacturing an optical fiber according to claim 1 , wherein the optical fiber is cooled in the annealing furnace for 0.1 seconds or more so that the temperature of the optical fiber becomes 1350° C. or more and 1500° C. or less. 5. A method for manufacturing an optical fiber comprising: drawing an optical fiber preform in a drawing furnace; and cooling the optical fiber drawn in an annealing furnace; wherein, when the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less, the optical fiber is cooled for 0.01 seconds or more in the annealing furnace so that the temperature of the optical fiber becomes 1300° C. or more and 1800° C. or less, and the temperature difference is higher than 60° C. and equal to 180° C. or less, and the temperature of the optical fiber is increased to a preset temperature of the annealing furnace for 0.001 to 0.1 seconds after the optical fiber enters the annealing furnace and then decreased. 6. The method for manufacturing an optical fiber according to claim 5 , wherein the optical fiber is cooled in the annealing furnace for 0.1 seconds or more. 7. The method for manufacturing an optical fiber according to claim 5 , wherein the optical fiber is cooled in the annealing furnace for 0.02 seconds or more so that the temperature of the optical fiber becomes 1450° C. or more and 1630° C. or less. 8. The method for manufacturing an optical fiber according to claim 5 , wherein the optical fiber is cooled in the annealing furnace for 0.1 seconds or more so that the temperature of the optical fiber becomes 1350° C. or more and 1500° C. or less.
Assignees
Inventors
Classifications
Fibres composed of different sorts of glass, {e.g. glass optical fibres}(C03B37/0253, C03B37/028 take precedence) · CPC title
Thermal treatment · CPC title
Optical fibres with cladding {with or without a coating} · CPC title
Controlling or measuring the draw furnace temperature · CPC title
Annealing or re-heating the drawn fibre prior to coating · CPC title
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- What does patent US11091385B2 cover?
- A method for manufacturing an optical fiber includes: drawing an optical fiber from an optical fiber preform in a drawing furnace; and cooling the optical fiber in an annealing furnace. When the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less. The …
- Who is the assignee on this patent?
- Fujikura Ltd
- What technology area does this patent fall under?
- Primary CPC classification C03B37/02727. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 17 2021 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).