OPTICAL FIBER BASE MATERIAL MANUFACTURING METHOD, OPTICAL FIBER BASE MATERIAL, AND OPTICAL FIBER

Title:

OPTICAL FIBER BASE MATERIAL MANUFACTURING METHOD, OPTICAL FIBER BASE MATERIAL, AND OPTICAL FIBER

Document Type and Number:

WIPO Patent Application WO/2018/110234

Kind Code:

A1

Abstract:

This embodiment relates to an optical fiber base material manufacturing method in which two or more types of alkaline metal elements are diffused and applied to an inner surface of a glass pipe, wherein said manufacturing method is provided with: a first drying step that is executed at a temperature that is equal to or less than the lowest temperature among the melting point temperatures of alkaline metal salt raw materials; and a second drying step that is executed at a temperature that is equal to or greater than the highest temperature among the melting point temperatures of the alkaline metal salt raw materials and at which the vapor pressure of the alkaline metal salt raw materials becomes equal to or less than 2 mmHg.

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Inventors:

SAKUMA HIROTAKA (JP)
TAMURA YOSHIAKI (JP)
MORITA KEISEI (JP)

Application Number:

PCT/JP2017/041986

Publication Date:

June 21, 2018

Filing Date:

November 22, 2017

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)

International Classes:

C03B37/018; C03B37/014; G02B6/02

Domestic Patent References:

WO2013118389A1	2013-08-15
WO2013118389A1	2013-08-15

Foreign References:

JP2016105154A	2016-06-09
JP2014162654A	2014-09-08
JP2013142049A	2013-07-22
JP2005537210A	2005-12-08
US20060130530A1	2006-06-22
JP2016105154A	2016-06-09

Other References: