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US 10,895,706 B2Granted
Method of manufacturing optical fiber and optical fiber
AssigneeFujikura Ltd.
InventorKenji Okada
Life of this patent
Estimating the term…
Abstract
A method of manufacturing an optical fiber, in which a coating is provided on a bare optical fiber, includes winding the optical fiber around a bobbin such that a strain relaxation coefficient Tε/K is less than or equal to 292, and an one-layer strain εn is greater than or equal to 0.01.
Claims3
A method of manufacturing an optical fiber in which a coating is provided on a bare optical fiber, the method comprising:
- winding the optical fiber around a bobbin;
- and
- setting a winding tension F [N] such that
- a strain relaxation coefficient Tε/K defined by the following Expression (2), Expression (3), and Expression (5) is less than or equal to 292, and
- a one-layer strain εn defined by the following Expression (7) is greater than or equal to 0.01,
- K
- coat
- =
- (
- E
- p
-
- /
-
- t
- p
- )
- 2
- ·
- 10
- -
- 19
- H
- 0
- 0.25
-
- μ
- -
- 0.125
-
- (
- E
- p
- +
- t
- s
- 3
- R
- s
- 3
-
- E
- s
- )
- 1.125
- -
- 0.25
-
- μ
- (
- 2
- )
- H
- 0
- =
- π
- 4
-
- E
- s
-
- (
- r
- s
- 4
- -
- r
- p
- 4
- )
- (
- 3
- )
- T
- ɛ
-
- /
-
- K
- =
- 2
-
- Fh
- (
- D
- +
- d
- +
- 2
- ×
- 2
-
- h
-
- /
-
- 3
- )
- ×
- d
- 2
- ×
- T
- w
- E
- P
- ×
- 1
- K
- coat
- ×
- 10
- 3
- (
- 5
- )
- ɛ
- n
- =
- 2
-
- F
- (
- D
- f
- +
- d
- )
- ×
- d
- ×
- 1
- E
- p
- (
- 7
- )
- where Kcoat is a coating coefficient,
- Ep [Pa] is a Young's modulus of a primary layer,
- tp [m] is a thickness of the primary layer,
- H0 is a secondary rigidity,
- μ is a surface coefficient of the bobbin,
- ts [m] is a thickness of a secondary layer,
- Rs [m] is an outer diameter of the coating,
- Es [Pa] is a Young's modulus of the secondary layer,
- rs [m] is an outer diameter of the secondary layer,
- rp [m] is an outer diameter of the primary layer,
- h [m] is a winding thickness,
- D [m] is a barrel diameter of the bobbin,
- d [m] is an outer diameter of the optical fiber,
- TW [hr] is a holding time, and
- Df [m] is a winding diameter when the optical fiber is wound around the bobbin.
149 more elements
Dependencies are inferred from the claim text.