Method of manufacturing large capacity preforms by MCVD

Details Method of manufacturing large capacity preforms by MCVD Method of manufacturing large capacity preforms by MCVD

2006-01-24

2006-01-24

Walls, Dionne A. (Department: 1731)

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

C065S397000, C065S419000, C065S421000, C065S436000

Reexamination Certificate

active

06988379

ABSTRACT:
The invention provides a low cost method of manufacturing high capacity preforms by chemical vapor deposition. More particularly, there is described a method of manufacturing an optical fiber preform, which method comprises the steps of providing a substrate tube of silica doped with sufficient chlorine to obtain an OH concentration of less than 100 ppb and doped with sufficient fluorine proportional to the chlorine doping to obtain a refractive index that is lower than that of a natural silica, depositing inner cladding and an optical core inside the substrate tube, collapsing the substrate tube to form a primary preform, and depositing outer cladding of said natural silica on the resulting primary preform. The invention is applicable to manufacturing optical fibers.

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Patent Abstracts of Japan, vol. 12, No. 391, Oct. 18, 1988 & JP 63 139028 A (Sumitomo Electric Ind LTD) Jun. 10, 1988.

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