Patents by Inventor John Popwell

John Popwell 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).

  • Methods and apparatuses for correcting mechanical twist in optical fiber
    Patent number: 7035525
    Abstract: Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical twist is mounted and fiber is drawn from the end of the spool to impart a specified counteracting mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is drawn there from, allowing the system to generate a precise amount of counteracting mechanical twist in the fiber.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: April 25, 2006
    Assignee: Fitel USA Corp.
    Inventors: Gene Kent Weeks, Stephen Mast, Zhi Zhou, John F. Ryan, III, Harry Douglas Garner, Jr., Siu-Ping Hong, John Popwell, Alan H. McCurdy
  • Methods and apparatuses for correcting mechanical twist in optical fiber
    Publication number: 20040062514
    Abstract: Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical twist is mounted and fiber is drawn from the end of the spool to impart a specified counteracting mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is drawn there from, allowing the system to generate a precise amount of counteracting mechanical twist in the fiber.
    Type: Application
    Filed: September 26, 2002
    Publication date: April 1, 2004
    Applicant: Fitel USA Corp.
    Inventors: Gene Kent Weeks, Stephen Mast, Zhi Zhou, John F. Ryan, Harry Douglas Garner, Siu-Ping Hong, John Popwell, Alan H. McCurdy
  • Apparatuses and methods for imparting mechanical twist in optical fibers
    Publication number: 20040062515
    Abstract: Methods and apparatuses introduce mechanical twist to an optical fiber having relatively large polarization mode dispersion (PMD), such as unspun fiber or fiber spun with constant spatial frequency, which mechanical twist reduces the fiber's PMD. A spool of optical fiber having relatively large PMD is mounted and fiber is pulled from the end of the spool to impart a specified mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is pulled therefrom, allowing the system to generate a precise amount of mechanical twist to the fiber. Also, it is possible to measure the amount of mechanical twist in an optical fiber and the amount of mechanical twist in an optical fiber as a function of fiber length.
    Type: Application
    Filed: May 1, 2003
    Publication date: April 1, 2004
    Inventors: Harry Douglas Garner, Siu-Ping Hong, James A. Hudson, David Kalish, Stephen Mast, Alan H. McCurdy, John Popwell, John F. Ryan, Gene Kent Weeks, Zhi Zhou