Patents by Inventor Roel Baets

Roel Baets 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 system with a dielectric subwavelength structure having high reflectivity and polarization selectivity
    Patent number: 6191890
    Abstract: The present invention is related to a system for transferring a beam of electromagnetic radiation having a vacuum wavelength. The system according to the invention includes a first dielectric medium, a second dielectric medium and a dielectric layer in between the first and the second medium. The dielectric layer has a periodicity of the dielectric properties parallel to the layer. The periodicity has a period that is smaller than the wavelength of the electromagnetic radiation in the second dielectric medium.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: February 20, 2001
    Assignees: Interuniversitair Micro-Elektronica Centrum vzw, University of Gent
    Inventors: Roel Baets, Bart Demeulenaere, Bart Dhoedt, Stefan Goeman
  • Integrated tunable optical filter
    Patent number: 5621828
    Abstract: An integrated tunable optical filter comprising a substrate made of a semiconducting material. The substrate includes first and second sections. The first section forms a tunable transmission filter, based on a codirectional coupler having a low selectivity. The second section forms a reflection filter with a reflection spectrum containing a number of peaks. A first injector, designed for current injection into said first section, is provided. Thus, the filter response of the first section is shifted in wavelength over a large wavelength range. There is also a second injector, designed for current injection into the second section. As a result, the reflective spectrum of the second section is slightly shifted in wavelength, in such a way that one reflection peak of the reflection spectrum corresponds to the coupling wavelength of the first section. Consequently, the total filter response has a very narrow bandwidth and wide tunability.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: April 15, 1997
    Assignee: Interuniversitair Micro-Elektronica Centrum VZW
    Inventors: Roel Baets, Jan Willems
  • Integrated tunable optical filter
    Patent number: RE36710
    Abstract: An integrated tunable optical filter comprising a substrate made of a semiconducting material. The substrate includes first and second sections. The first section forms a tunable transmission filter, based on a codirectional coupler having a low selectivity. The second section forms a reflection filter with a reflection spectrum containing a number of peaks. A first injector, designed for current injection into said first section, is provided. Thus, the filter response of the first section is shifted in wavelength over a large wavelength range. There is also a second injector, designed for current injection into the second section. As a result, the reflective spectrum of the second section is slightly shifted in wavelength, in such a way that one reflection peak of the reflection spectrum corresponds to the coupling wavelength of the first section. Consequently, the total filter response has a very narrow bandwidth and wide tunability.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: May 23, 2000
    Assignee: Interuniversitair Micro-Elektronica Centrum VZW
    Inventors: Roel Baets, Jan Willems