Patents by Inventor Sigurd Weidemann Løvseth

Sigurd Weidemann Løvseth 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).

  • Rare-earth-doped waveguide
    Patent number: 7024092
    Abstract: The present invention is to a method of adapting optical rare-earth-doped waveguide (10) having a plurality of transverse propagation modes, such that in use, signal gains of non-fundamental modes of the waveguide are attenuated relative to a signal gain of a fundamental mode of the waveguide. The waveguide (10) has a light-guiding region (45) defined by a refractive index-modifying dopant, such as Ge, which has a thermal diffusion coefficient at temperature T in the waveguide greater than a thermal diffusion coefficient of the rare-earth dopant at temperature T. The method comprises heating the waveguide (10) at the temperature T such that a concentration profile of the refractive index-modifying dopant becomes broader than a concentration profile of the rare-earth dopant.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: April 4, 2006
    Assignees: The University of Sydney, The Commonwealth of Australia represented by the Defence Science and Technology Organization of the Department of Defence
    Inventors: Mark Andrew Englund, Sigurd Weidemann Loevseth
  • Rare-earth-doped waveguide
    Publication number: 20040052495
    Abstract: The present invention is to a method of adapting optical rare-earth-doped waveguide (10) having a plurality of transverse propagation modes, such that in use, signal gains of non-fundamental modes of the waveguide are attenuated relative to a signal gain of a fundamental mode of the waveguide. The waveguide (10) has a light-guiding region (45) defined by a refractive index-modifying dopant, such as Ge, which has a thermal diffusion coefficient at temperature T in the waveguide greater than a thermal diffusion coefficient of the rare-earth dopant at temperature T. The method comprises heating the waveguide (10) at the temperature T such that a concentration profile of the refractive index-modifying dopant becomes broader than a concentration profile of the rare-earth dopant.
    Type: Application
    Filed: July 12, 2003
    Publication date: March 18, 2004
    Inventors: Mark Andrew Englund, Sigurd Weidemann Loevseth
  • Waveguide laser source
    Patent number: 6693923
    Abstract: A Bragg Grating optical waveguide laser source comprising at least one Bragg grating in a rare earth doped waveguide and an optical pump source coupled to said doped waveguide, said Bragg gratings having at least two different peak reflection wavelengths and at least one of said Bragg gratings comprising a phase-shift and a phase-shift actuator being coupled to the phase-shift for controlled application of changes in the phase-shift thus activating or deactivating the corresponding Bragg grating waveguide laser.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: February 17, 2004
    Assignee: Optoplan AS
    Inventors: Jon Thomas Kringlebotn, Sigurd Weidemann Løvseth