Invention Grant
- Patent Title: Drawing method for bare optical fiber with suppressed hydrogen diffusion
- Patent Title (中): 具有抑制氢扩散的裸光纤的拉制方法
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Application No.: US11433576Application Date: 2006-05-15
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Publication No.: US07658086B2Publication Date: 2010-02-09
- Inventor: Kenji Okada , Koichi Harada , Shunichirou Hirafune , Munehisa Fujimaki
- Applicant: Kenji Okada , Koichi Harada , Shunichirou Hirafune , Munehisa Fujimaki
- Applicant Address: JP Tokyo
- Assignee: Fujikura Ltd.
- Current Assignee: Fujikura Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Main IPC: C03B37/023
- IPC: C03B37/023

Abstract:
A drawing method for a bare optical fiber, comprises the steps of: melting an optical fiber preform using a heating device and drawing the bare optical fiber; and naturally cooling down the bare optical fiber or forcibly cooling down the bare optical fiber by a cooling device after the heating and melting step, wherein a temperature history during the drawing the optical fiber preform to obtain the bare optical fiber in the heating device satisfies a relational expression: T≦−0.01X+12 where a time period when the heated and molten portion of the optical fiber preform heated and molten by the heating device reaches 1800° C. or higher is T (min) and a OH group concentration in a cladding layer of the optical fiber preform is X (wtppm).
Public/Granted literature
- US20060204193A1 Drawing method for bare optical fiber, manufacturing method for optical fiber, and optical fiber Public/Granted day:2006-09-14
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