Patents by Inventor Karl H. Tietgen

Karl H. Tietgen 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).

  • Device for deflecting light through 180 degrees
    Patent number: 4492425
    Abstract: A device for deflecting light through 180.degree. characterized by a directional coupler comprising a pair of strip waveguides formed on a substrate with the end faces of the pair of strip waveguides being provided with a mirror. The directional coupler may be formed as a half of a coupler with the mirror effectively bisecting the length of the coupler, or it may be a .DELTA..beta. reversible directional coupler which is the whole length or as a half of a directional coupler. In addition, the directional coupler may be a controllable power dividing coupler and a phase shifter may be applied on one of the waveguides of the coupler. The device can also be utilized in a spectral comb filter.
    Type: Grant
    Filed: January 8, 1982
    Date of Patent: January 8, 1985
    Assignee: Siemens Aktiengesellschaft
    Inventors: Ralf T. Kersten, Karl H. Tietgen, Helmut F. Schlaak