Patents by Inventor Kokou Dossou

Kokou Dossou 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).

  • Planar waveguide grating devices having controlled polarization dependent sensitivity and method of manufacturing thereof
    Patent number: 7420734
    Abstract: Diffraction gratings are formed from grooves each having a reflective facet and a non-reflective facet. The net reflection of TE (Transverse Electric) and TM (Transverse Magnetic) polarizations from the grating structure is traded off against the polarization dependent reflection, by controlling the degree of metallization of the reflective facet and by ensuring that there is no metallization of non-reflective sidewalls. other diffraction gratings are manufactured from trenches etched perpendicular to a waveguide. The trenches are metallized and back-filled with a filling material having a refractive index matched to that of the waveguide. The gratings essentially have no non-reflecting sidewalls with insignificant polarization influence from side walls.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: September 2, 2008
    Assignee: Valorbec Societe En Commandite
    Inventors: Ashok Balakrishnan, Kokou Dossou, Muthukumaran Packirisamy
  • Echelle gratings with low Polarization Dependent Loss (PDL) using metal coating on the reflecting facets only
    Patent number: 7376305
    Abstract: An Echelle grating has alternate first (1a) and second (1b) sets of facets (1). The first set of facets (1a) is operative to reflect incident light (4) for diffraction and the second set of facets (1b) extends between adjacent facets of the first set (1a). Only the first set of facets (1a) is metallized to enhance reflection. The second set of facets (1b) is left unmetallized. This configuration reduces polarization dependent loss (PDL).
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: May 20, 2008
    Assignee: Enablence Inc.
    Inventors: Andre Delage, Boris Lamontagne, Kokou Dossou, Siegfried Janz, Pavel Cheben, Lynden Erickson, Dan-Xia Xu, Sylvain Charbonneau
  • Echelle gratings with low polarization dependent loss ( PDL) using metal coating on the reflecting facets only
    Publication number: 20060209411
    Abstract: An Echelle grating has alternate first (1a) and second (1b) sets of facets (1). The first set of facets (1a) is operative to reflect incident light (4) for diffraction and the second set of facets (1b) extends between adjacent facets of the first set (1a). Only the first set of facets (1a) is metallized to enhance reflection. The second set of facets (1b) is left unmetallized. This configuration reduces polarization dependent loss (PDL).
    Type: Application
    Filed: November 26, 2002
    Publication date: September 21, 2006
    Inventors: Andre Delage, Boris Lamontagne, Kokou Dossou, Siegfried Janz, Pavel Cheben, Lynden Erickson, Dan-Xia Xu, Sylvain Charbonneau
  • Planar waveguide grating devices having controlled polarization dependent sensitivity and method of manufacturing thereof
    Publication number: 20060119945
    Abstract: Diffraction gratings are formed from grooves each having a reflective facet and a non-reflective facet. The net reflection of TE (Transverse Electric) and TM (Transverse Magnetic) polarizations from the grating structure is traded off against the polarization dependent reflection, by controlling the degree of metallization of the reflective facet and by ensuring that there is no metallization of non-reflective sidewalls. other diffraction gratings are manufactured from trenches etched perpendicular to a waveguide. The trenches are metallized and back-filled with a filling material having a refractive index matched to that of the waveguide. The gratings essentially have no non-reflecting sidewalls with insignificant polarization influence from side walls.
    Type: Application
    Filed: August 26, 2003
    Publication date: June 8, 2006
    Inventors: Ashok Balakrishnan, Kokou Dossou, Muthukumaran Packirisamy