Patents by Inventor Illana Massarek

Illana Massarek 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 device with a defined total device stress and method for manufacturing it
    Patent number: 6501895
    Abstract: An optical device with a defined total device stress (&sgr;10) and a therefrom resulting defined birefringence in order to obtain a well defined optical polarization dependence is proposed. It comprises a lower cladding layer (3) with a first refractive index (n3), thereon an upper cladding layer (5) with a second refractive index (n5) and between an optical waveguide core (4) with a third refractive index (n4) which is bigger than the first refractive index (n3) and the second refractive index (n5). The optical waveguide core (4) has a waveguide core stress (&sgr;4) resulting from the manufacturing process and the upper cladding layer (5) is manufactured to have an inherent cladding layer stress (&sgr;5) which together with the waveguide core stress (&sgr;4) results in the total device stress (&sgr;10).
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: December 31, 2002
    Assignee: International Business Machines Corporation
    Inventors: Peter Bloechl, Gian-Luca Bona, Roland W. Germann, Horst Folkert, Illana Massarek, Bert Jan Offrein, Huub L. Salemink, Dorothea W. Wiesmann