Patents by Inventor Nils Jacobson

Nils Jacobson 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).

  • Patent number: 9352996
    Abstract: An optical fiber preform, and method for fabricating, having a first core, a second core spaced from the first core and first and second regions, the first region having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing the first straight length. One of the regions can comprise the first core and the other comprises the second core. The preform can be drawn with rotation to provide a fiber wherein a first core of the fiber is multimode at a selected wavelength of operation and a second core of the fiber is spaced from and winds around the first core and has a selected longitudinal pitch. The second core of the fiber can couple to a higher order mode of the first core and increase the attenuation thereof relative to the fundamental mode of the first core.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: May 31, 2016
    Assignee: Nufern
    Inventors: Douglas Guertin, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Publication number: 20130291603
    Abstract: An optical fiber preform, and method for fabricating, having a first core, a second core spaced from the first core and first and second regions, the first region having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing the first straight length. One of the regions can comprise the first core and the other comprises the second core. The preform can be drawn with rotation to provide a fiber wherein a first core of the fiber is multimode at a selected wavelength of operation and a second core of the fiber is spaced from and winds around the first core and has a selected longitudinal pitch. The second core of the fiber can couple to a higher order mode of the first core and increase the attenuation thereof relative to the fundamental mode of the first core.
    Type: Application
    Filed: July 3, 2013
    Publication date: November 7, 2013
    Inventors: Douglas Guertin, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Publication number: 20100008634
    Abstract: An optical fiber preform, and method for fabricating, having a first core, a second core spaced from the first core and first and second regions, the first region having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing the first straight length. One of the regions can comprise the first core and the other comprises the second core. The preform can be drawn with rotation to provide a fiber wherein a first core of the fiber is multimode at a selected wavelength of operation and a second core of the fiber is spaced from and winds around the first core and has a selected longitudinal pitch. The second core of the fiber can couple to a higher order mode of the first core and increase the attenuation thereof relative to the fundamental mode of the first core.
    Type: Application
    Filed: September 18, 2009
    Publication date: January 14, 2010
    Applicant: NUFERN
    Inventors: Douglas Guertin, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Patent number: 7634164
    Abstract: A fiber optic article can comprise a core, an inner region disposed about the core and a cladding disposed about the inner region. The index of refraction of the cladding can be less than that of the inner region, and the index of refraction of the inner region can be less than that of the core. The fiber can include a second cladding disposed about the cladding, where the second cladding has an index of refraction that is less than the index of refraction of the cladding. The inner region can have a non circular outer perimeter that includes at least one inwardly oriented section. The article can be elongate along a longitudinal axis and can include at least one longitudinally extending region, such as a stress inducing region, for providing birefringence and the inwardly oriented region can face the longitudinally extending region. The fiber optic article can include active material for providing light responsive to the article receiving pump light, such as, for example, one or more rare earths.
    Type: Grant
    Filed: May 23, 2006
    Date of Patent: December 15, 2009
    Assignee: Nufern
    Inventors: Julia A. Farroni, Upendra H. Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Publication number: 20090129735
    Abstract: An optical fiber comprising a multimode glass core having a diameter of at least 250 microns and an index of refraction and a polymer cladding having a thickness and contactingly surrounding a glass portion of the fiber so as to define an interface between the glass portion and the polymer cladding. The polymer cladding can have a first index of refraction that is less than the index of refraction. The fiber can comprise a density of less than 0.25 non-conforming regions having a diameter of 25 microns or greater per millimeter of length along the fiber, where each of the non-conforming regions is a region visible to the human eye under an optical microscope and having at least a portion thereof within a selected distance of the interface. The selected distance can be less than or equal to the thickness of the polymer cladding. The optical microscope can have a total magnification of about 200. The polymer cladding can be applied to at least a part of the optical fiber in at least a class 1000 environment.
    Type: Application
    Filed: January 27, 2009
    Publication date: May 21, 2009
    Applicant: NUFERN
    Inventors: Martin Seifert, Upendra H. Manyam, Mansoor Alam, Kanishka Tankala, Jaroslaw Abramczyk, Douglas Guertin, Nils Jacobson
  • Patent number: 7483610
    Abstract: An optical fiber comprising a multimode glass core having a diameter of at least 250 microns and an index of refraction and a polymer cladding having a thickness and contactingly surrounding a glass portion of the fiber so as to define an interface between the glass portion and the polymer cladding. The polymer cladding can have a first index of refraction that is less than the index of refraction. The fiber can comprise a density of less than 0.25 non-conforming regions having a diameter of 25 microns or greater per millimeter of length along the fiber, where each of the non-conforming regions is a region visible to the human eye under an optical microscope and having at least a portion thereof within a selected distance of the interface. The selected distance can be less than or equal to the thickness of the polymer cladding. The optical microscope can have a total magnification of about 200. The polymer cladding can be applied to at least a part of the optical fiber in at least a class 1000 environment.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: January 27, 2009
    Assignee: Nufern
    Inventors: Martin Seifert, Upendra H. Manyam, Mansoor Alam, Kanishka Tankala, Jaroslaw Abramczyk, Douglas Guertin, Nils Jacobson
  • Patent number: 7412135
    Abstract: An optical fiber coupler can include at least a first input optical fiber and an output optical fiber, where the first input optical fiber can comprise an antiguiding core, a first cladding disposed about the antiguiding core and a second cladding disposed about the first cladding so as to tend to confine light to said first cladding. The output fiber can comprise a guiding core, a first cladding disposed about the guiding core and a second cladding disposed about the first cladding of the output fiber for tending to confine light to the first cladding of the output fiber. Optical fibers are also disclosed, as are methods.
    Type: Grant
    Filed: January 23, 2006
    Date of Patent: August 12, 2008
    Assignee: Nufern
    Inventors: Martin Seifert, Upendra H. Manyam, Michael O'Connor, Nils Jacobson
  • Patent number: 7167621
    Abstract: An optical fiber for the transmission of electromagnetic energy, where the fiber can have increased input power threshold for the onset of Stimulated Brillouin Scattering (SBS). The fiber can comprise a core and a cladding disposed about the core. The core can have a distribution of velocities for an acoustic wave associated with SBS, where the distribution of propagation velocities of the core for the acoustic wave is at least one of a) azimuthally asymmetric or b) non-constant in an azimuthal plane and longitudinally asymmetric. The fiber can be longitudinally asymmetric wherein the core includes a first portion having a propagation velocity for the acoustic wave that is substantially the same throughout interposed between longitudinally spaced portions each having a propagation velocity different than that of said first portion. Methods, such as, for example, methods for fabricating and/or using a fiber having an increased threshold input power for the onset of SBS, are also disclosed.
    Type: Grant
    Filed: November 3, 2004
    Date of Patent: January 23, 2007
    Assignee: Nufern
    Inventors: Upendra H. Manyam, Kanishka Tankala, Nils Jacobson
  • Patent number: 7156154
    Abstract: The present invention relates to a device for continuous or semi-continuous casting of a metal material. The device comprises a first arrangement comprising a coil (7) having an extension around the casting mould (2) in an area, which is arranged to comprise molten metal material. The coil (7) is arranged to be fed with alternating current such that a varying magnetic field generated and is applied to the molten metal material in the casting mould (2). The device also comprises a second arrangement comprising at least two magnetic poles (8), which are provided at opposite sides of the casting mould (2). The poles (8) are arranged to supply a static or periodic low-frequency magnetic field to the molten metal material in the casting area. The poles (8) comprise at least a portion (11) which comprises a plurality of material layers which are electrically insulated from each other.
    Type: Grant
    Filed: May 6, 2005
    Date of Patent: January 2, 2007
    Assignee: ABB AB
    Inventors: Nils Jacobson, Jan Erik Eriksson, Erik Svensson
  • Publication number: 20060251367
    Abstract: An optical fiber coupler can include at least a first input optical fiber and an output optical fiber, where the first input optical fiber can comprise an antiguiding core, a first cladding disposed about the antiguiding core and a second cladding disposed about the first cladding so as to tend to confine light to said first cladding. The output fiber can comprise a guiding core, a first cladding disposed about the guiding core and a second cladding disposed about the first cladding of the output fiber for tending to confine light to the first cladding of the output fiber. Optical fibers are also disclosed, as are methods.
    Type: Application
    Filed: January 23, 2006
    Publication date: November 9, 2006
    Inventors: Martin Seifert, Upendra Manyam, Michael O'Connor, Nils Jacobson
  • Publication number: 20060245714
    Abstract: A fiber optic article, such as an optical fiber or an optical preform, can include a core comprising a concentration of erbium, a concentration of fluorine and a concentration of ytterbium for sensitizing the erbium by absorbing pump light and transferring energy to the erbium. The erbium can provide light having a second wavelength different than the wavelength of the pump light. The article can also include a concentration of phosphorus. The fiber optic article can include a cladding disposed about the core, where the cladding has an index of refraction that is less than the index of refraction of the core, and a second cladding disposed about the first cladding, where the second cladding includes an index of refraction than is less than the index of refraction of the cladding. The fiber optic article can be elongate along a longitudinal axis and can include a longitudinally extending region for providing birefringence.
    Type: Application
    Filed: June 13, 2006
    Publication date: November 2, 2006
    Applicant: Nufern
    Inventors: Julia Farroni, Upendra Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Patent number: 7121324
    Abstract: A device for continuous or semi-continuous casting of metal comprising a mould having a number of mould elements (1, 2) which together form a mould adapted for receiving a liquid metal (6), a mould supporting structure (30, 31) surrounding the mould and mechanically supporting it, and an induction coil (20) arranged close to the mould for reducing the contact pressure between the melt and the mould. At least one of the mould elements is divided into at least a first (1a, 2a) and a second (1b, 2b) part arranged so that they are electrically insulated from each other, the first mould element part being arranged before the second mould element part relative to the casting direction and said induction coil is arranged close to the first mould element part (1a, 2a).
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: October 17, 2006
    Assignee: ABB AB
    Inventors: Nils Jacobson, Erik Svensson
  • Publication number: 20060198590
    Abstract: A fiber optic article can comprise a core, an inner region disposed about the core and a cladding disposed about the inner region. The index of refraction of the cladding can be less than that of the inner region, and the index of refraction of the inner region can be less than that of the core. The fiber can include a second cladding disposed about the cladding, where the second cladding has an index of refraction that is less than the index of refraction of the cladding. The inner region can have a non circular outer perimeter that includes at least one inwardly oriented section. The article can be elongate along a longitudinal axis and can include at least one longitudinally extending region, such as a stress inducing region, for providing birefringence and the inwardly oriented region can face the longitudinally extending region. The fiber optic article can include active material for providing light responsive to the article receiving pump light, such as, for example, one or more rare earths.
    Type: Application
    Filed: May 23, 2006
    Publication date: September 7, 2006
    Applicant: NUFERN
    Inventors: Julia Farroni, Upendra Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Patent number: 7062137
    Abstract: A fiber optic article, such as an optical fiber or an optical preform, can include a core comprising a concentration of erbium, a concentration of fluorine and a concentration of ytterbium for sensitizing the erbium by absorbing pump light and transferring energy to the erbium. The erbium can provide light having a second wavelength different than the wavelength of the pump light. The article can also include a concentration of phosphorus. The fiber optic article can include a cladding disposed about the core, where the cladding has an index of refraction that is less than the index of refraction of the core, and a second cladding disposed about the first cladding, where the second cladding includes an index of refraction than is less than the index of refraction of the cladding. The fiber optic article can be elongate along a longitudinal axis and can include a longitudinally extending region for providing birefringence.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: June 13, 2006
    Assignee: Nufern
    Inventors: Julia A. Farroni, Upendra H. Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Patent number: 7050686
    Abstract: A fiber optic article can comprise a core, an inner region disposed about the core and a cladding disposed about the inner region. The index of refraction of the cladding can be less than that of the inner region, and the index of refraction of the inner region can be less than that of the core. The fiber can include a second cladding disposed about the cladding, where the second cladding has an index of refraction that is less than the index of refraction of the cladding. The inner region can have a non circular outer perimeter that includes at least one inwardly oriented section. The article can be elongate along a longitudinal axis and can include at least one longitudinally extending region, such as a stress inducing region, for providing birefringence and the inwardly oriented region can face the longitudinally extending region. The fiber optic article can include active material for providing light responsive to the article receiving pump light, such as, for example, one or more rare earths.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: May 23, 2006
    Assignee: Nufern
    Inventors: Julia A. Farroni, Upendra H. Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Publication number: 20060093294
    Abstract: An optical fiber for the transmission of electromagnetic energy, where the fiber can have increased input power threshold for the onset of Stimulated Brillouin Scattering (SBS). The fiber can comprise a core and a cladding disposed about the core. The core can have a distribution of velocities for an acoustic wave associated with SBS, where the distribution of propagation velocities of the core for the acoustic wave is at least one of a) azimuthally asymmetric or b) non-constant in an azimuthal plane and longitudinally asymmetric. The fiber can be longitudinally asymmetric wherein the core includes a first portion having a propagation velocity for the acoustic wave that is substantially the same throughout interposed between longitudinally spaced portions each having a propagation velocity different than that of said first portion. Methods, such as, for example, methods for fabricating and/or using a fiber having an increased threshold input power for the onset of SBS, are also disclosed.
    Type: Application
    Filed: November 3, 2004
    Publication date: May 4, 2006
    Inventors: Upendra Manyam, Kanishka Tankala, Nils Jacobson
  • Publication number: 20060029343
    Abstract: A fiber optic article can comprise a core, an inner region disposed about the core and a cladding disposed about the inner region. The index of refraction of the cladding can be less than that of the inner region, and the index of refraction of the inner region can be less than that of the core. The fiber can include a second cladding disposed about the cladding, where the second cladding has an index of refraction that is less than the index of refraction of the cladding. The inner region can have a non circular outer perimeter that includes at least one inwardly oriented section. The article can be elongate along a longitudinal axis and can include at least one longitudinally extending region, such as a stress inducing region, for providing birefringence and the inwardly oriented region can face the longitudinally extending region. The fiber optic article can include active material for providing light responsive to the article receiving pump light, such as, for example, one or more rare earths.
    Type: Application
    Filed: August 5, 2004
    Publication date: February 9, 2006
    Inventors: Julia Farroni, Upendra Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Publication number: 20060029344
    Abstract: A fiber optic article, such as an optical fiber or an optical preform, can include a core comprising a concentration of erbium, a concentration of fluorine and a concentration of ytterbium for sensitizing the erbium by absorbing pump light and transferring energy to the erbium. The erbium can provide light having a second wavelength different than the wavelength of the pump light. The article can also include a concentration of phosphorus. The fiber optic article can include a cladding disposed about the core, where the cladding has an index of refraction that is less than the index of refraction of the core, and a second cladding disposed about the first cladding, where the second cladding includes an index of refraction than is less than the index of refraction of the cladding. The fiber optic article can be elongate along a longitudinal axis and can include a longitudinally extending region for providing birefringence.
    Type: Application
    Filed: August 5, 2004
    Publication date: February 9, 2006
    Inventors: Julia Farroni, Upendra Manyam, Nils Jacobson, Kanishka Tankala, Adrian Carter
  • Publication number: 20050254765
    Abstract: An optical fiber comprising a multimode glass core having a diameter of at least 250 microns and an index of refraction and a polymer cladding having a thickness and contactingly surrounding a glass portion of the fiber so as to define an interface between the glass portion and the polymer cladding. The polymer cladding can have a first index of refraction that is less than the index of refraction. The fiber can comprise a density of less than 0.25 non-conforming regions having a diameter of 25 microns or greater per millimeter of length along the fiber, where each of the non-conforming regions is a region visible to the human eye under an optical microscope and having at least a portion thereof within a selected distance of the interface. The selected distance can be less than or equal to the thickness of the polymer cladding. The optical microscope can have a total magnification of about 200. The polymer cladding can be applied to at least a part of the optical fiber in at least a class 1000 environment.
    Type: Application
    Filed: May 3, 2005
    Publication date: November 17, 2005
    Inventors: Martin Seifert, Upendra Manyam, Mansoor Alam, Kanishka Tankala, Jaroslaw Abramczyk, Douglas Guertin, Nils Jacobson
  • Publication number: 20050205235
    Abstract: The present invention relates to a device for continuous or semi-continuous casting of a metal material. The device comprises a first arrangement comprising a coil (7) having an extension around the casting mould (2) in an area, which is arranged to comprise molten metal material. The coil (7) is arranged to be fed with alternating current such that a varying magnetic field generated and is applied to the molten metal material in the casting mould (2). The device also comprises a second arrangement comprising at least two magnetic poles (8), which are provided at opposite sides of the casting mould (2). The poles (8) are arranged to supply a static or periodic low-frequency magnetic field to the molten metal material in the casting area. The poles (8) comprise at least a portion (11) which comprises a plurality of material layers which are electrically insulated from each other.
    Type: Application
    Filed: May 6, 2005
    Publication date: September 22, 2005
    Applicant: ABB AB
    Inventors: Nils Jacobson, Jan Eriksson, Erik Svensson