US 2023/0023064 A1 · METHOD FOR MANUFACTURING OPTICAL FIBER GLASS PREFORM

Abstract

Provided is a method for manufacturing an optical fiber glass preform in which a refractive index distribution is stable in a longitudinal direction of the glass preform. A method for manufacturing an optical fiber glass preform includes: depositing a porous glass preform by a vapor phase method; and sintering the porous glass preform in a heating region, when sintering the porous glass preform, the porous glass preform being inserted into a vessel of a sintering furnace, and an inside of the vessel being heated with a heater installed on an outer periphery of the vessel to form the heating region. The sintering is started after a surface temperature difference of the porous glass preform in a longitudinal direction is made 50° C. or lower.

Claims20

Dependent claims

A method for manufacturing an optical fiber glass preform, the method comprising:

depositing a porous glass preform by a vapor phase method;
and
sintering the porous glass preform in a heating region, when sintering the porous glass preform, the porous glass preform being inserted into a vessel of a sintering furnace, and an inside of the vessel being heated with a heater installed on an outer periphery of the vessel to form the heating region, wherein
the sintering is started after a surface temperature difference of the porous glass preform in a longitudinal direction is made 50° C. or lower.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/855,821Filed 1 Jul 2022

Priority

JP 2021-11531312 Jul 2021

Published

26 Jan 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

C03B 37/01446
Made entirely or partially by chemical means , e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or…
C03B 37/01453
Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering: for doping the preform with flourine
C03B 37/0146
Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering: furnaces therefor, e.g. muffle tubes, furnace linings
C03B 37/0148
Made entirely or partially by chemical means , e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or…

Method for manufacturing optical fiber glass preform

Life of this patent

Method for manufacturing optical fiber glass preform

Life of this patent

Abstract

Claims20