Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Reexamination Certificate
2004-04-15
2008-09-02
Griffin, Steven P. (Department: 1791)
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
C065S033100, C065SDIG015, C423S088000, C423S565000, C117S073000, C117S077000, C501S040000
Reexamination Certificate
active
07418835
ABSTRACT:
This invention pertains to a chalcogenide glass of low optical loss that can be on the order of 30 dB/km or lower, and to a process for preparing the chalcogenide glass. The process includes the steps of optionally preparing arsenic monochalcogenide precursor or the precursor can be provided beforehand; dynamically distilling the precursor in an open system under vacuum from a hot section to a cold section to purify same; homogenizing the precursor in a closed system so that it is of a uniform color; disposing the distilled or purified precursor and at least one chalcogenide element at a hot section of an open distillation system; dynamically distilling under vacuum in an open system so that the precursor and the at least one chalcogenide element are deposited at a cold section of the open system in a more purified state; homogenizing the precursor and the at least chalcogenide element in a closed system while converting the precursor and the at least one chalcogenide element from crystalline phase to glassy phase.
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Churbanov, M. F., Scripachev, I. V., Snopatin, G. E., Shiryaev, V. S., Plotnichenko, V. G., “High-Purity Glasses Based on Arsenic Chalcogenides”, Journal of Optoelectronics and Advanced materials vol. 3, No. 2, Jun. 2001, p. 341-349.
“Vacuum Distillation”, (http://en.wikipedia.org/wiki/Vacuum—distillation) accessed Jan. 11, 2007.
Aggarwal Ishwar D.
Nguyen Vinh Q.
Sanghera Jasbinder S.
Griffin Steven P.
Grunkemeyer Joseph T.
Karasek John J.
Lazorcik Jason L.
The United States of America as represented by the Secretary of
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