Production method of optical fiber preform, and production method of optical fiber

Patent metadata

Field	Value
Publication number	US-9695079-B2
Application number	US-201514920534-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	May 1, 2013
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A production method of an optical fiber preform includes first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms, and first arranging a second cladding portion to surround the first preform. At the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles. The first preform and the burner are moved relative to each other in a longitudinal direction of the first preform. The glass particles are deposited on the first preform.

First claim

What is claimed is:

1. A production method of an optical fiber preform, the method comprising:
first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms; and
first arranging a second cladding portion to surround the first preform, wherein
at the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles,
the first preform and the burner are moved relative to each other in a longitudinal direction of the first preform,
the glass particles are deposited on the first preform, and
the first preparing includes second arranging a center glass preform as one of the plurality of glass preforms, fourth arranging the first cladding portion in which a material gas and a combustion gas are ejected from a burner to produce glass particles, the center glass preforms and the burner are moved relative to each other in a longitudinal direction of the center glass preforms, and the glass particles are deposited on the center glass preform, and third arranging an outer periphery glass preform as another one of the plurality of glass preforms on an outer periphery of the center glass preform on which the first cladding portion is disposed.

2. The production method of the optical fiber preform according to claim 1 , wherein the first cladding portion is disposed so that a cross section of the first preform is close to a round shape.

3. The production method of the optical fiber preform according to claim 1 , wherein the first preparing includes second arranging a center glass preform as one of the plurality of glass preforms, third arranging an outer periphery glass preform as another one of the plurality of glass preforms on an outer periphery of the center glass preform, and fourth arranging the first cladding portion in which a material gas and a combustion gas are ejected from a burner to produce glass particles, the center glass preforms and the burner are moved relative to each other in a longitudinal direction of the center glass preforms, and the glass particles are deposited on the center glass preform.

4. The production method of the optical fiber preform according to claim 3 , wherein, at the fourth arranging, the glass particles are deposited on the center glass preform while rotating the plurality of glass preforms around center axes of the respective glass preforms.

5. The production method of the optical fiber preform according to claim 1 , wherein, the first preparing includes fifth arranging the first cladding portion in which a glass rod is disposed in a gap between adjacent glass preforms of the plurality of glass preforms.

6. The production method of the optical fiber preform according to claim 1 , further comprising, next to the fourth arranging, first forming a recessed portion extending in a longitudinal direction of the first preform at an outer periphery of the first cladding portion, wherein
at the third arranging, the outer periphery glass preform is disposed at a position corresponding to the recessed portion.

7. The production method of the optical fiber preform according to claim 1 , wherein the first cladding portion is a columnar-shaped member on which a recessed portion extending in a longitudinal direction of the first preform, and the first preparing includes sixth arranging in which the glass preform is disposed at a position corresponding to the recessed portion.

8. The production method of the optical fiber preform according to claim 1 , further comprising, next to the first arranging:
seventh arranging at least one glass preform at an outer periphery of the second cladding portion; and
eighth arranging in which a material gas and a combustion gas are ejected from a burner to produce glass particles, the arranged second cladding portion and the burner are moved relative to each other in the longitudinal direction of the second cladding portion, and a third cladding portion is arranged by depositing the glass particles on the second cladding portion.

9. A production method of an optical fiber in which an optical fiber preform is drawn which is produced by the production method of the optical fiber preform according to claim 1 .

10. A production method of an optical fiber preform, the method comprising:
first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms; and
first arranging a second cladding portion to surround the first preform, wherein
at the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles,
the first preform and the burner are moved relative to each other in a longitudinal direction of the first preform,
the glass particles are deposited on the first preform, and
the first cladding portion is a columnar-shaped member on which a recessed portion extending in a longitudinal direction of the first preform, and the first preparing includes sixth arranging in which the glass preform is disposed at a position corresponding to the recessed portion.

11. The production method of the optical fiber preform according to claim 10 , wherein the first cladding portion is made of a powder compact.

12. The production method of the optical fiber preform according to claim 10 , wherein the first cladding portion is made of glass.

13. The production method of the optical fiber preform according to claim 10 , wherein the first cladding portion is made of semi-sintered glass.

14. The production method of the optical fiber preform according to claim 10 , further comprising, next to the first arranging:
seventh arranging at least one glass preform at an outer periphery of the second cladding portion; and
eighth arranging in which a material gas and a combustion gas are ejected from a burner to produce glass particles, the arranged second cladding portion and the burner are moved relative to each other in the longitudinal direction of the second cladding portion, and a third cladding portion is arranged by depositing the glass particles on the second cladding portion.

15. A production method of an optical fiber in which an optical fiber preform is drawn which is produced by the production method of the optical fiber preform according to claim 10 .

16. A production method of an optical fiber preform, the method comprising:
first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms; and
first arranging a second cladding portion to surround the first preform, wherein
at the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles,
the first preform and the burner are moved relative to each other in a longitudinal direction of the first preform,
the glass particles are deposited on the first preform,
the method further comprising, next to the first arranging:
seventh arranging at least one glass preform at an outer periphery of the second cladding portion; and
eighth arranging in which a material gas and a combustion gas are ejected from a burner to produce glass particles, the arranged second cladding portion and the burner are moved relative to each other in the longitudinal direction of the second cladding portion, and a third cladding portion is arranged by depositing the glass particles on the second cladding portion.

17. A production method of an optical fiber in which an optical fiber preform is drawn which is produced by the production me

Assignees

• Furukawa Electric Co Ltd

Inventors

• Gonda Tomohiro
• Imamura Katsunori
• Miyabe Ryo
• Sugizaki Ryuichi

Classifications

• C03B2203/23

  Double or multiple optical cladding profiles · CPC title

• C03B37/01486

  Means for supporting, rotating or translating the preforms being formed, e.g. lathes (C03B37/01884 takes precedence) · CPC title

• G02B6/02042

  Multicore optical fibres · CPC title

• C03B2203/34

  Plural core other than bundles, e.g. double core · CPC title

• C03B37/018

  by glass deposition on a glass substrate, e.g. by {inside-, modified-, plasma- or plasma modified-} chemical vapour deposition {[ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod} (C03B37/016 takes precedence; surface treatment of glass by coating with glass C03C17/02) · CPC title