Optical waveguides – Optical fiber waveguide with cladding
Reexamination Certificate
2008-03-13
2010-12-07
Ullah, Akm E (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
C385S142000, C065S091000, C065S434000
Reexamination Certificate
active
07848606
ABSTRACT:
A method is provided for eliminating crystals in non-oxide optical fiber preforms as well as optical fibers drawn therefrom. The optical-fiber-drawing axis of the preform is aligned with the force of gravity. A magnetic field is applied to the preform as it is heated to at least a melting temperature thereof. The magnetic field is applied in a direction that is parallel to the preform's optical-fiber-drawing axis. The preform is then cooled to a temperature that is less than a glass transition temperature of the preform while the preform is maintained in the magnetic field. When the processed preform is to have an optical fiber drawn therefrom, the preform's optical-fiber-drawing axis is again aligned with the force of gravity and a magnetic field is again applied along the axis as the optical fiber is drawn from the preform.
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LaPointe Michael R.
Tucker Dennis S.
Bergen Peter J. Van
McGroary James J.
The United States of America as represented by the Administrator
Ullah Akm E
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