Optical fiber having a low polarization mode dispersion and process and apparatus for producing it
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United States of America Patent
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Aug 5, 2008
Grant Date -
Jul 6, 2006
app pub date -
Sep 22, 2003
filing date -
Sep 25, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for producing a low-PMD optical fiber having a furnace for melting a lower portion of an optical preform; a traction device for pulling an optical fiber from the lower portion of an optical preform; a spinning device for imparting a substantially constant and unidirectional spin to the optical fiber as it is pulled, which causes the fiber to undergo an elastic torsion; a winding device for winding the optical fiber onto a reel; and a twisting device for imparting to the spun optical fiber a unidirectional twist in a direction opposite the elastic torsion, so as to control the residual twist in the optical fiber. A process for producing the fiber, an optical fiber and a cable are also provided.
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