Patents by Inventor Dan Jakobsen

Dan Jakobsen 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).

  • Optical fibers with reduced splice loss and methods for making same
    Patent number: 7221838
    Abstract: An optical fiber has a core region and a first cladding region surrounding the core. The first cladding region is doped to increase the fiber's refractive index volume. A second cladding region surrounds the first cladding region. The second cladding region is doped to reduce the fiber's cutoff wavelength, offsetting an increase in the fiber's cutoff wavelength caused by the first cladding region. An outer cladding surrounds the cutoff reduction region. In a further embodiment, the volume increasing region is doped to have a refractive index profile that is sloped to increase from the region's outer circumference towards its inner circumference. In another embodiment, the cutoff reduction region has a step refractive index profile that may have more than one section.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: May 22, 2007
    Assignee: Furukawa Electric North America, Inc.
    Inventors: Dan Jakobsen, Bera Palsdottir, Torben E. Veng
  • Optical fibers with reduced splice loss and methods for making same
    Publication number: 20050286848
    Abstract: An optical fiber has a core region and a first cladding region surrounding the core. The first cladding region is doped to increase the fiber's refractive index volume. A second cladding region surrounds the first cladding region. The second cladding region is doped to reduce the fiber's cutoff wavelength, offsetting an increase in the fiber's cutoff wavelength caused by the first cladding region. An outer cladding surrounds the cutoff reduction region. In a further embodiment, the volume increasing region is doped to have a refractive index profile that is sloped to increase from the region's outer circumference towards its inner circumference. In another embodiment, the cutoff reduction region has a step refractive index profile that may have more than one section.
    Type: Application
    Filed: June 23, 2004
    Publication date: December 29, 2005
    Applicant: Furukawa Electric North America, Inc.
    Inventors: Dan Jakobsen, Bera Palsdottir, Torben Veng