Patents by Inventor Frederic Hayrault

Frederic Hayrault has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of controlling the polarization mode dispersion of an optical fiber during fiber drawing
    Patent number: 7284397
    Abstract: An optical fiber drawing installation is equipped with an oscillating pulley that applies torsion to the fiber alternately in one rotation direction and then in the opposite direction. To control the torsion applied to the fiber, images are formed of the fiber and the pulley. The images are analyzed to determine the position of the fiber relative to the pulley. The torsion is calculated from the calculated position, on the assumption that the fiber rolls on the pulley.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: October 23, 2007
    Assignee: Draka Comteq B.V.
    Inventors: Eric Lainet, Frédéric Hayrault, Daniel Coelho
  • Method of controlling the polarization mode dispersion of an optical fiber during fiber drawing
    Publication number: 20040123629
    Abstract: An optical fiber drawing installation is equipped with an oscillating pulley that applies torsion to the fiber alternately in one rotation direction and then in the opposite direction. To control the torsion applied to the fiber, images are formed of the fiber and the pulley. The images are analyzed to determine the position of the fiber relative to the pulley. The torsion is calculated from the calculated position, on the assumption that the fiber rolls on the pulley.
    Type: Application
    Filed: December 12, 2003
    Publication date: July 1, 2004
    Applicant: ALCATEL
    Inventors: Eric Lainet, Frederic Hayrault, Daniel Coelho