Patents by Inventor Bernhard W. Bach

Bernhard W. Bach 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).

  • Apparatus and method for the reduction of polarization sensitivity in diffraction gratings used in fiber optic communications devices
    Patent number: 6400509
    Abstract: A diffraction grating for use in multiplexing and demultiplexing optical signals in optical communication systems having reduced polarization sensitivity has a plurality of grooves including reflective step surfaces and transverse riser surfaces separated by a flat. The step surfaces have a reflective coating and the riser surfaces do not have a reflective coating. A method of making a reflective diffraction grating includes forming a plurality of grooves in a substrate, the grooves having a step surface for reflecting an incident beam, a transverse riser and a flat therebetween and providing a reflective coating on the steps and not on the risers.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: June 4, 2002
    Assignee: Zolo Technologies, Inc.
    Inventors: Andrew D. Sappey, Bernhard W. Bach