Method of manufacturing optical fiber base material and method of manufacturing optical fiber

Patent metadata

Field	Value
Publication number	US-10246366-B2
Application number	US-201213628444-A
Country	US
Kind code	B2
Filing date	Sep 27, 2012
Priority date	Sep 30, 2011
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Provided is a method of manufacturing an optical fiber base material by an inside mounting method, including: a step of rotating and heating a glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube, wherein in the step, the glass tube is warped so that an axis between respective fixed portions of the glass tube has a shape in which a catenary curve is reversed in the vertical direction.

First claim

What is claimed is:

1. A method of manufacturing an optical fiber base material comprising steps of:
(a) preparing a glass tube; and
(b) rotating and heating the glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube,
wherein the glass tube is fixed such that an axis of the glass tube has a substantially inverted catenary curve shape in the vertical direction while the glass tube is heated.

2. The method of manufacturing the optical fiber base material according to claim 1 , wherein



B
-
A



L
2

≦
0.000150

is satisfied,
wherein A is an absolute value of an inclination of the axis at the fixed portions of the fixed glass tube,
B is an absolute value of an inclination of the axis at the fixed portions of the glass tube obtained from an equation of a catenary curve of the glass tube, and
L is a linear distance between the respective fixed portions.

3. The method of manufacturing the optical fiber base material according to claim 2 , wherein
the gas is a raw material gas for laminating the glass layer, and
in the step (b), a glass layer is laminated on an inner wall of the glass tube by the raw material gas.

4. The method of manufacturing the optical fiber base material according to claim 3 , wherein
in the step (b), an MCVD method is used.

5. The method of manufacturing the optical fiber base material according to claim 2 , wherein
the gas is an etching gas, and
the step (b) further comprises etching the inner wall of the glass tube by the etching gas.

6. The method of manufacturing the optical fiber base material according to claim 2 , wherein



B
-
A



L
2

≦
0.000125

is satisfied.

7. The method of manufacturing the optical fiber base material according to claim 6 , wherein
the gas is a raw material gas for laminating the glass layer, and
in the step (b), a glass layer is laminated on an inner wall of the glass tube by the raw material gas.

8. The method of manufacturing the optical fiber base material according to claim 7 , wherein
in the step (b), an MCVD method is used.

9. The method of manufacturing the optical fiber base material according to claim 6 , wherein
the gas is an etching gas, and
the step (b) further comprises etching the inner wall of the glass tube by the etching gas.

10. The method of manufacturing the optical fiber base material according to claim 6 , wherein



B
-
A



L
2

≦
0.000100

is satisfied.

11. The method of manufacturing the optical fiber base material according to claim 10 , wherein
the gas is a raw material gas for laminating the glass layer, and
in the step (b), a glass layer is laminated on an inner wall of the glass tube by the raw material gas.

12. The method of manufacturing the optical fiber base material according to claim 11 , wherein
in the step (b), an MCVD method is used.

13. The method of manufacturing the optical fiber base material according to claim 10 , wherein
the gas is an etching gas, and
the step (b) further comprises etching the inner wall of the glass tube by the etching gas.

14. The method of manufacturing the optical fiber base material according to claim 1 , wherein
the gas is an etching gas, and
the step (b) further comprises etching the inner wall of the glass tube by the etching gas.

15. The method of manufacturing the optical fiber base material according to claim 1 , wherein
the gas is a raw material gas for laminating the glass layer, and
in the step (b), a glass layer is laminated on an inner wall of the glass tube by the raw material gas.

16. The method of manufacturing the optical fiber base material according to claim 15 , wherein
in the step (b), an MCVD method is used.

17. A method of manufacturing an optical fiber comprising steps of:
preparing a glass tube;
rotating and heating the glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube to form an optical fiber base material, wherein the glass tube is fixed such that an axis of the glass tube has a substantially inverted catenary curve shape in the vertical direction while the glass tube is heated; and
drawing the optical fiber base material.

Assignees

• Fujikura Ltd

Inventors

• Oozeki Nobuo
• Ichii Kentaro
• Arai Tomofumi

Classifications

• C03B37/01869

  Collapsing · CPC title

• C03B2201/34

  doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers · CPC title

• C03B37/01861 Primary

  Means for changing or stabilising the diameter or form of tubes or rods · CPC title

• C03B2201/30

  doped with metals, e.g. Ga, Sn, Sb, Pb or Bi · CPC title

• C03B2201/31

  doped with germanium · CPC title