Patent · US Expired

Fluorine-doped optical fibre and method of manufacturing such fibre

US4802733A · kind A · utility

24Cited by

11References

15Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Peter Klaus Bachmann · Würselen, DE
Peter E. E. Geittner · Aachen, DE
Dieter Leers · Stolberg, DE
Howard J. C. Wilson · Aachen, DE

Key dates

Filing date	Dec 30, 1985
Grant date	Feb 7, 1989
Priority date	—
Expiry date	Dec 30, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B2203/22
WIPO fieldOther special machines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.