Optical fiber and method of producing same

Details Optical fiber and method of producing same Optical fiber and method of producing same

1984-02-13

1986-07-08

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 32, C03B 37018

Patent

active

045990980

ABSTRACT:
Low signal attenuation optical fibers and methods for making such fibers mimimize the internal and interface defects while providing high throughput by radial deposition of successive particulate layers about a small diameter start element and co-vitrification of the layers followed by drawing to the small final diameter that is desired. Radial vapor deposition of an interface layer on the start element, followed by an encompassing core and then a cladding provides boundaries that form transitional continuums after the structure has been vitrified. The start element remains as part of the core but is so small as to have no discernible effect on light propagation, and the number of interfaces in the light propagating portion is limited by maintaining the ratio of the cladding thickness to the core radius to less than 1.5 in the initial preform. By drawing this preform to form separate rods, additional cladding is applied to form a fiber preform from which optical fibers may be drawn.

REFERENCES:
patent: 3823995 (1974-07-01), Carpenter
patent: 4227907 (1980-10-01), Merritt
patent: 4360371 (1982-11-01), Blankenship

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