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Optical fiber mother material producing method, optical fiber mother material, optical fiber, optical fiber mother material producing device

A manufacturing method and technology of optical fiber base material, applied in the field of optical fiber base material and optical fiber, can solve the problems of uneven wall thickness, uneven heat in the circumferential direction, etc.

Inactive Publication Date: 2007-06-06
MITSUBISHI CABLE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the tube deviates from the central axis of the heating furnace, the heat applied to the tube is not uniform in the circumferential direction, so that the wall thickness of the tube before being integrated with the rod is not uniform

Method used

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  • Optical fiber mother material producing method, optical fiber mother material, optical fiber, optical fiber mother material producing device
  • Optical fiber mother material producing method, optical fiber mother material, optical fiber, optical fiber mother material producing device
  • Optical fiber mother material producing method, optical fiber mother material, optical fiber, optical fiber mother material producing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] Regarding the bending of the pipe, an example actually performed will be described.

[0150] First, as Example 1-1, an optical fiber preform 30 was manufactured using the above-mentioned manufacturing apparatus 10 . The outer diameter of the tube 23 used at this time was 179.4 mm, the inner diameter was 54.1 mm, and the outer diameter of the rod 27 was 51.4 mm. The average gap between the inner peripheral surface of the tube 23 and the peripheral surface of the rod 27 was 1.35 mm. As manufacturing conditions, both the feeding speed of the tube 23 and the feeding speed of the rod 27 were 14.4 m / min.

[0151] In Example 1-1, the direction of the tube 23 is held on the above-mentioned tube holder 12 so that the mark 28 is aligned with the deflection direction of the tube holder 12, and at the same time, the tube 23 and the rod 27 are integrated. , the inclination of the tube 23 is corrected.

[0152] In addition, as Comparative Example 1-1, an optical fiber preform 30 w...

Embodiment 2

[0161] About the temperature distribution of a heating furnace, the Example which was actually carried out is demonstrated. First, as Comparative Example 2-1, an optical fiber preform 30 was manufactured using the manufacturing apparatus 10 described above. The outer diameter of the tube 23 used at this time was 180 mm, the inner diameter was 54 mm, and the outer diameter of the rod 27 was 50 mm. The average gap between the inner peripheral surface of the tube 23 and the peripheral surface of the rod 27 was 2.32 mm. In addition, as a manufacturing condition, the amount of glass processed (the total glass amount of the integrated tube 23 and rod 27 per unit time) was 360 ml / min. In addition, the amount of glass processed can be adjusted by adjusting the feeding speed of the pipe 23 and the rod 27 into the heating furnace 15 . The speed ratio which is the ratio of the feed speed of the tube 23 to the feed speed of the rod 27 was set to 0.90.

[0162] In addition, in Comparati...

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Abstract

PROBLEM TO BE SOLVED: To stably supply an optical fiber preform 30 free from the eccentricity of a core by making the direction of the central axis C1 of an effective part 21 of a quartz pipe 20 always same in an apparatus and a method for the optical fiber preform by the rod-in-tube method.SOLUTION: A plane A passing on each central axis C1 and C2, when the effective part 21 of the quartz pipe 20 and an upper side dummy pipe 22 make an angle with each other, is made parallel to the inclined direction of the effective part 21 from the vertical direction when a pipe holding part 12 is deflected by the dead weight of the quartz pipe 20.

Description

technical field [0001] The present invention relates to a method for manufacturing an optical fiber base material by a so-called rod-in-tube method, a manufacturing device, and an optical fiber base material and an optical fiber manufactured by the manufacturing method. Background technique [0002] Optical fibers are widely used in various fields including communications. Such an optical fiber is manufactured by drawing a cylindrical optical fiber base material. The optical fiber base material can use MCVD (Modified Chemical Vapor Deposition: improved chemical vapor deposition) method, OVD (Outside Vapor-phase Deposition: external vapor phase deposition) method, VAD (Vapor-phase Axial Deposition: vapor phase axial deposition method) ) and rod-in-tube manufacturing. [0003] Among them, the rod-in-tube method is a method of manufacturing an optical fiber base material by integrating a quartz tube and a quartz rod including a core using a ring-shaped heating furnace. Specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012C03B37/027
CPCC03B37/02736Y02P40/57
Inventor 金正高高野刚志长江伸定田村昌弘仁科伦太郎
Owner MITSUBISHI CABLE IND LTD