Heavy metal fluoride glass containing indium trifluoride
AssigneeGalileo Corporation
InventorsAnnapoorna Akella, Elizabeth A. Downing, Lubos J. B. Vacha
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Abstract
A heavy metal fluoride glass composition for an optical fiber in mole percent, about: 20 to 40% InF.sub.3, 20 to 0% GaF.sub.3, 2 to 10% PbF.sub.2, 0 to 25% ZnF.sub.2, 0 to 25% CdF.sub.2,10 to 25% BaF.sub.2, 0 to 6% NaCl, 0 to 6% NaF, 0 to 7% SrF.sub.2 and 0 to 5% CaF.sub.2 ; the total of InF.sub.3 and GaF.sub.3 being about 40%; the total of BaF.sub.2, SrF.sub.2 and CaF.sub.2 being about 25%; the total of ZnF.sub.2 and CdF.sub.2 being about 25%, and the total of NaCl and NaF being about 6%; said composition being further doped with a lanthanide series heavy metal fluoride in amount up to about 1%.
Claims18
A heavy metal fluoride bulk glass composition used to form an optical fiber comprising, in mole percent, about:
- 20 to 40% InF.sub.3, 20 to 0% GaF.sub.3, 2 to 10% PbF.sub.2, 0 to 25% ZnF.sub.2, 0 to 25% CdF.sub.2, 10 to 25% BaF.sub.2, 0 to 6% NaCl, 0 to 6% NaF, 0 to 7% SrF.sub.2 and 0 to 5% CaF.sub.2 ;
- the total of InF.sub.3 and GaF.sub.3 being about 40%;
- the total of BaF.sub.2, SrF.sub.2 and CaF.sub.2 being about 25%;
- the total of ZnF.sub.2 and CdF.sub.2 being between about 10 to 25%, and the total of NaCl and NaF being about 6%;
- said composition being further doped with a lanthanide series heavy metal fluoride in an amount up to about 1%.
A praseodymium-doped, heavy metal fluoride glass fiber suitable for use as an optical fiber amplifier, comprising, in mole percent, about:
- 20 to 40% InF.sub.3, 20 to 0% GaF.sub.3, 2 to 10% PBF.sub.2, 0 to 25% ZnF.sub.2, 0 to 25% CdF.sub.2, 10 to 25% BaF.sub.2, 0 to 6% NaCl, 0 to 6% NaF, 0 to 7% SrF.sub.2, and 0 to 5% CaF.sub.2 ;
- the total of InF.sub.3 and GaF.sub.3 being about 40%;
- the total of BaF.sub.2, SrF.sub.2 and CaF.sub.2 being about 25%;
- the total of ZnF.sub.2 and CdF.sub.2 being between about 10 to 25%, and the total of NaCl and NaF being about 6%;
- said composition containing about 0.2 to 1.0 mole percent of PrF.sub.3.
A heavy metal fluoride glass used to form an optical fiber or as a bulk glass, comprising, in mole percent, about:
- 28% InF.sub.3, 20% ZnF.sub.2, 16.5% BaF.sub.2, 12% GaF.sub.3, 9% PbF.sub.2, 6% NaF, 5% SrF.sub.2, 3% CaF.sub.2, and 0.5% of a heavy metal fluoride from the lanthanide series, and in which there is a substantial absence of ZrF.sub.4.
A praseodymium-doped heavy metal fluoride composition glass fiber suitable for use as an optical fiber amplifier, comprising, in mole percent, about:
- 20 to 40% InF.sub.3, 2 to 10% PBF.sub.2, 0 to 25% ZnF.sub.2, 0 to 25% CdF.sub.2, 10 to 25% BaF.sub.2, 0 to 6% NaF;
- the ZnF.sub.2 and CdF.sub.2 being between about 10 to 25%;
- said composition containing about 0.5 mole percent of PrF.sub.3.
Dependencies are inferred from the claim text.