Optical fiber preform with improved air/glass interface structure
US7854143B2 · kind B2 · utility
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15References
12Claims
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Key dates
| Filing date | Dec 22, 2006 |
| Grant date | Dec 21, 2010 |
| Priority date | — |
| Expiry date | May 23, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2978
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An optical fiber preform comprising a plurality of longitudinal air holes is subjected to a thermal treatment (i.e., heating), coupled with the application of a compressive force on either end of the heated preform to compress the entire preform structure a predetermined amount. The thermal compression treatment has been found to smooth any roughened glass surfaces and heal microcracks that may have formed during the preform fabrication process, essentially “knitting” the glass material back together and forming a preform of improved quality over the prior art microstructured preforms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.