Patents by Inventor Stephanus J. Spammer

Stephanus J. Spammer 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).

  • Publication number: 20030161601
    Abstract: In accordance with an exemplary embodiment of the present invention, a method of forming at least one layer over an optical element includes providing the optical fiber which has a central axis; rotating the optical element about the central axis; and forming the layer with a substantially uniform thickness during the rotation.
    Type: Application
    Filed: February 28, 2002
    Publication date: August 28, 2003
    Inventors: Mike X. Ouyang, Stephanus J. Spammer
  • Patent number: 6546167
    Abstract: One aspect of the invention is an optical add/drop multiplexer. The optical add/drop multiplexer includes a first optical circulator, the first circulator includes a first port, a second port, and a third port. The optical add/drop multiplexer also includes a first tunable grating coupled to the first port and a second tunable grating coupled to the first grating. The optical add/drop multiplexer further includes a second optical circulator, the second optical circulator includes a fourth port, coupled to the second grating; a fifth port, and a sixth port. Wherein the first tunable grating is a fiber Bragg grating and wherein the second tunable grating is a fiber Bragg grating.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: April 8, 2003
    Assignee: Corning Incorporated
    Inventors: Gang Chen, Stephanus J. Spammer, Laura A. Weller-Brophy
  • Patent number: 5289259
    Abstract: Apparatus 200 for extracting a variable from two quadrature signals which are functions of the variable is disclosed and claimed. The apparatus is particularly suitable for use with a minimum configuration open-loop fiber optic gyroscope 100 to provide a signal (V.sub.out) proportional to the Sagnac phase shift, which is proportional to the rotation rate .OMEGA. of fiber loop 20. The apparatus comprises a trigonometric transformation circuit 30, a dynamic control circuit 32, a feedback loop 33, an adder and a feedforward loop 32.1. The adder, in use, adding an output signal of the dynamic control circuit and a signal in the feedforward loop to provide the signal (V.sub.out), with improved dynamic response. The apparatus also comprises a reset circuit 34 for extending the angular range of the apparatus. An adaptive reset circuit for improving the dynamic range of the apparatus is also disclosed.
    Type: Grant
    Filed: August 7, 1992
    Date of Patent: February 22, 1994
    Assignee: Rand Afrikaans University
    Inventors: Stephanus J. Spammer, Pieter L. Swart