Method for manufacturing optical fiber glass preform
US12421156B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2022 |
| Grant date | Sep 23, 2025 |
| Priority date | — |
| Expiry date | Apr 12, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2205/72
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.