Cladding glass for optical fiber
First Claim
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1. A cladding glass for optical fiber, which consists essentially of 60 to 80% by weight of silicon dioxide (SiO2);
- 4 to 7% by weight of aluminum oxide (Al2 O3);
7 to 12% by weight of boron oxide (B2 O3), 6 to 8% by weight of sodium oxide (Na2 O), 3.5 to 6% by weight of potassium oxide (K2 O), and 2 to 4% by weight of lithium oxide (Li2 O), such that the total content of alkali metal oxide in said cladding glass ranges between about 9 and 17% by weight;
from 0 to 8% by weight of an alkaline earth metal oxide;
more tha 0 and up to 7% by weight of at least one selected from the group consisting of zinc oxide (ZnO), zirconium dioxide (ZrO2) and titanium dioxide (TiO2), wherein the amount of TiO2 is less than 1% of the cladding glass composition; and
more than 0 but not more than 3% by weight of fluorine (F), said cladding glass having a refractive index value of not more than 1.511 4.
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Abstract
A cladding glass for optical fiber comprises 60 to 80% by weight of silicon dioxide (SiO2), 0.5 to 10% by weight of aluminum oxide (Al2 O3), 9 to 17% by weight of an alkali metal oxide, 3 to 15% by weight of boron oxide (B2 O3) and more than 0 but not more than 3% by weight of fluorine (F). The cladding glass of this invention can simultaneously satisfy low refractive index and lowered viscosity, and is also excellent in water resistance and weathering resistance.
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Citations
12 Claims
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1. A cladding glass for optical fiber, which consists essentially of 60 to 80% by weight of silicon dioxide (SiO2);
- 4 to 7% by weight of aluminum oxide (Al2 O3);
7 to 12% by weight of boron oxide (B2 O3), 6 to 8% by weight of sodium oxide (Na2 O), 3.5 to 6% by weight of potassium oxide (K2 O), and 2 to 4% by weight of lithium oxide (Li2 O), such that the total content of alkali metal oxide in said cladding glass ranges between about 9 and 17% by weight;
from 0 to 8% by weight of an alkaline earth metal oxide;
more tha 0 and up to 7% by weight of at least one selected from the group consisting of zinc oxide (ZnO), zirconium dioxide (ZrO2) and titanium dioxide (TiO2), wherein the amount of TiO2 is less than 1% of the cladding glass composition; and
more than 0 but not more than 3% by weight of fluorine (F), said cladding glass having a refractive index value of not more than 1.511 4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 4 to 7% by weight of aluminum oxide (Al2 O3);
Specification