Patent
1985-12-30
1989-02-07
Sikes, William L.
350 9630, 65 311, G02B 600, G02B 610, C03C 2502
Patent
active
048027332
ABSTRACT:
In an optical fiber based on silicon dioxide with fluorine doping which determines its refractive index profile, at least in the light transmitting core a substance is added that increases the thermal expansion coefficient. The added substance is uniformly distributed at least in the light transmitting core, and reduces the influence of the drawing force F.sub.Z (during drawing of the preform) on the Rayleigh scattering .alpha..sub.R and the wavelength-independent "c term" losses. Even at high fluorine dopant concentrations, low Rayleigh scattering losses in the range of the material-intrinsic losses pure for silicon dioxide are achieved. The OH-contamination level is also further reduced, and cracks in the collapsed preforms are largely avoided.
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Bachmann Peter K.
Geittner Peter E. E.
Leers Dieter
Wilson Howard J. C.
Bartlett Ernestine C.
Sikes William L.
U.S. Philips Corp.
Ullah Akm E.
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