Ultralow-loss silica glass and optical fibers using the same
US6153546A · kind A · utility
23Cited by
8References
2Claims
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Key dates
| Filing date | Jan 13, 1999 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Jan 13, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2201/54
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This ultralow-loss glass is characterized in that high purity silica glass contains 1 to 500 wt.ppm of at least one network modifying oxide. It is assumed that the network modifying oxide appropriately loosens the tetrahedral network structure of silica and hence Rayleigh scattering is decreased. Examples of the network modifying oxide include Na.sub.2 O, K.sub.2 O, Li.sub.2 O, MgO, CaO, and PbO. Since Rayleigh scattering losses are minimal in comparison with those of high purity silica glass, this impurity-added silica glass is excellent as a base material of a glass fiber for a long-distance transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.