Method for manufacturing an optical fiber

Patent metadata

Field	Value
Publication number	US-12030808-B2
Application number	US-202117159670-A
Country	US
Kind code	B2
Filing date	Jan 27, 2021
Priority date	Jan 29, 2020
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

A method for manufacturing an optical fiber, the method includes: exposing a bare fiber formed of glass and having a temperature of 500° C. to 1,500° C. to a gas in which a moisture content is controlled to 2 to 20 g/m3; applying an uncured resin to an outer periphery of the bare fiber; and curing the resin to form a coating layer.

First claim

What is claimed is:

1. A method for manufacturing an optical fiber, the method comprising:
exposing a bare fiber having a temperature of 500° C. to 1,500° C. to a gas in which a moisture content is controlled to 2 to 20 g/m 3 , wherein the bare fiber is formed of glass;
applying an uncured resin to an outer periphery of the bare fiber; and
curing the resin to form a coating layer, wherein
any one of Expression (3), (4), or (5) is satisfied:
3≤W≤5 and 0.3≤T≤0.4  (3);

4≤W≤15 and 0.1≤T≤0.3  (4);

10≤W≤15 and 0.05≤T≤0.3  (5),

where
W (g/m 3 ) is the moisture content of the gas, and
T (sec) is a time for exposing the bare fiber to the gas.

2. The method for manufacturing an optical fiber according to claim 1 , wherein the bare fiber is cooled by a cooling device after the bare fiber is exposed to the gas.

3. The method for manufacturing an optical fiber according to claim 1 , wherein
the gas includes helium, and
the bare fiber is exposed to the gas in a cooling device for cooling the bare fiber.

4. The method for manufacturing an optical fiber according to claim 1 , wherein the bare fiber is exposed to the gas such that a pulling force of the bare fiber pulled from the coating layer is 1.1 N/mm or less.

5. A method for manufacturing an optical fiber, the method comprising:
exposing a bare fiber having a temperature of 500° C. to 1,500° C. to a gas in which a moisture content is controlled to 2 to 20 g/m 3 , wherein the bare fiber is formed of glass;
applying an uncured resin to an outer periphery of the bare fiber; and
curing the resin to form a coating layer, wherein
Expression (6) or (7) is satisfied:
10≤W≤15 and 0.1≤T≤0.3  (6);

4≤W≤5 and 0.3≤T≤0.4  (7),

where
W (g/m 3 ) is the moisture content of the gas, and
T (sec) is a time for exposing the bare fiber to the gas.

6. The method for manufacturing an optical fiber according to claim 5 , wherein the bare fiber is cooled by a cooling device after the bare fiber is exposed to the gas.

7. The method for manufacturing an optical fiber according to claim 5 , wherein
the gas includes helium, and
the bare fiber is exposed to the gas in a cooling device for cooling the bare fiber.

8. The method for manufacturing an optical fiber according to claim 5 , wherein the bare fiber is exposed to the gas such that a pulling force of the bare fiber pulled from the coating layer is 1.1 N/mm or less.

Assignees

• Fujikura Ltd

Inventors

• Yamashiro Kenji
• Kashiwazaki Miryo

Classifications

• C03C25/106

  Single coatings · CPC title

• C03C25/26

  Macromolecular compounds or prepolymers · CPC title

• C03C25/607

  in the gaseous phase · CPC title

• C03C25/12 Primary

  General methods of coating; Devices therefor · CPC title