Method for making optical fiber preforms

Details Method for making optical fiber preforms Method for making optical fiber preforms

1991-06-21

1992-11-03

Jones, W. Gary

Glass manufacturing

Processes

Forming product or preform from molten glass

65 41, 65 608, 65130, 65DIG15, 65DIG16, C03C 2502

Patent

active

051605210

ABSTRACT:
A method for fabricating defect-free optical fiber preforms without light scattering defects such as core-clad interface bubbles, core-clad crystalline inclusions and core glass crystals involves first forming a cladding glass shell preferably by rotational casting, then separately melting core glass inside a cylindrical crucible and quenching using metallic quenching blocks to prevent crystal formation in the core glass, next heating the core containing crucible to the core glass softening point and also heating the cladding tube containing mold to the glass transition temperature of the cladding glass, then placing the cladding tube containing mold inside the core glass crucible and pushing it downwardly with high pressure so that the softened core glass is forced into the cladding glass tube, and finally the preform is annealed to remove thermal stress. Subsequently, the preform is drawn into optical fibers using conventional technology.

REFERENCES:
patent: 3880634 (1975-04-01), Deeg et al.
patent: 4457771 (1984-07-01), Ambrogi
patent: 4519826 (1985-05-01), Tran
patent: 4812155 (1989-03-01), Kyoto et al.
patent: 4969941 (1990-11-01), Kyoto et al.

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