Patents by Inventor Markku Kapulainen

Markku Kapulainen 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).

  • Method for controlling an optoelectronic component
    Patent number: 7386196
    Abstract: A method for controlling an optoelectronic component that includes two waveguides. The refractive index of the first waveguide is changed periodically with a first control signal, the amplitude of which is changed between a first amplitude level and higher second amplitude level. The refractive index of the second waveguide is changed periodically with a second control signal, the amplitude of which is changed between the aforementioned first amplitude level and a lower third amplitude level. When the control signals are on their common first amplitude level, the refractive indices of the waveguides are equal and the phase difference between them is zero. When the first control signal is on the second amplitude level and the second control signal on the third amplitude level, the refractive indices of the waveguides are unequal so that their mutual phase difference has a predetermined target value.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: June 10, 2008
    Assignee: Valtion Teknillinen Tutkimuskeskus
    Inventors: Timo Aalto, Markku Kapulainen, Mikko Harjanne, Markku Rono
  • Method for controlling an optoelectronic component
    Publication number: 20060088239
    Abstract: A method for controlling an optoelectronic component that includes two waveguides. The refractive index of the first waveguide is changed periodically with a first control signal, the amplitude of which is changed between a first amplitude level and higher second amplitude level. The refractive index of the second waveguide is changed periodically with a second control signal, the amplitude of which is changed between the aforementioned first amplitude level and a lower third amplitude level. When the control signals are on their common first amplitude level, the refractive indices of the waveguides are equal and the phase difference between them is zero. When the first control signal is on the second amplitude level and the second control signal on the third amplitude level, the refractive indices of the waveguides are unequal so that their mutual phase difference has a predetermined target value.
    Type: Application
    Filed: September 4, 2003
    Publication date: April 27, 2006
    Inventors: Timo Aalto, Markku Kapulainen, Mikko Harjanne, Markku Rono