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US 6,587,624 B2Granted
Polarization retaining fiber
AssigneeCorning Incorporated
InventorsWilliam R. Christoff, Paul D. Doud, John W. Gilliland
Life of this patent
Estimating the term…
Abstract
A glass preform is drawn into a fiber. Holes, running the length of the preform, collapse during the drawing, causing the core to have an elliptical cross section.
Claims9
An optical fiber comprising
- a core having a viscosity, refractive index n1 and an elliptically-shaped cross-section having a major axis radius b1, a minor axis radius a1 and an aspect ratio ρ1, wherein ρ1 equals b1/a1;
- a low viscosity glass layer having a viscosity not greater than the viscosity of said core, an elliptically-shaped cross-section surrounding said core, said low viscosity layer having a major axis radius b2 and a minor axis radius a2, and an aspect ratio ρ2, wherein ρ2 equals b2/a2, wherein the aspect ratio ρ1 is greater than the aspect ratio ρ2;
- and
- a cladding glass layer having a viscosity and a refractive index n2 surrounding said low viscosity layer, the viscosity of said low viscosity layer being lower than the viscosity of said cladding glass region.
1 more element
An optical fiber comprising
- a core having a viscosity at a draw temperature, refractive index n1 and an elliptically-shaped cross-section having a major axis radius b1, a minor axis radius a1 and an aspect ratio ρ1, wherein ρ1 equals b1/a1;
- a low viscosity glass layer having a viscosity at the draw temperature not greater than the viscosity of the core at the draw temperature, an elliptically-shaped cross-section surrounding the core, the low viscosity layer having major axis radius b2 and a minor axis radius a2, and an aspect ratio ρ2,
- wherein ρ2 equals b2/a2, wherein the aspect ratio ρ1 is greater than the aspect ratio ρ2;
- and
- a cladding glass layer having a viscosity at a draw temperature and a refractive index n2 surrounding the low viscosity layer, the viscosity of the low viscosity layer at the draw temperature being lower than the viscosity of the cladding glass region at the draw temperature.
2 more elements
Dependencies are inferred from the claim text.