Optical fiber

Details Optical fiber Optical fiber

1980-02-19

1983-07-12

Lee, John D.

350 9634, G02B 5172

Patent

active

043927157

ABSTRACT:
In an optical fiber having a core whose material consists essentially of vitreous silica, said core having a jacket of plastic which is optically effective at least on a length of 10 m reckoned from the light input end of the fiber and which has a refractive index n.sub.M which is smaller than that of the core, the improvement wherein the core has an outer layer whose refractive index n.sub.ext is smaller than the refractive index n.sub.K of the remaining inner core portion which is constant and greater than the refractive index n.sub.M of the jacket, and n.sub.ext lies in the range from n.sub.K -(n.sub.K -n.sub.M). (0.25 to 0.8) and whose thickness amounts to between 0.8 .mu.m and 8 .mu.m.

REFERENCES:
patent: 3869194 (1975-03-01), Shiraishi et al.
patent: 4165915 (1979-08-01), Rau et al.
patent: 4277271 (1981-07-01), Krohn
patent: 4294514 (1981-10-01), Schneider

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