Patents by Inventor Pieter H. van Heyningen

Pieter H. van Heyningen 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).

  • Ranging method for use in TDMA systems on tree-and-branch optical networks
    Patent number: 5299044
    Abstract: In a passive optical tree-and-branch network, which utilizes the Asynchronous Transfer Mode (ATM) transmission format, a superimposed low-level, single frequency, ranging signal is used to determine the distance between an Optical Line Termination (OLT) node and any Optical Network Termination Node (ONT) of the network. In one embodiment of the invention, this ranging frequency is a low frequency signal that is superimposed on top of the transmitted data signal from the OLT. This ranging signal is returned to the OLT from a particular ONT upon the issuance of a ranging command from the OLT. The phase difference between the transmitted ranging signal and the received ranging signal is proportional to the distance between the OLT and that particular ONT. In a second embodiment of the invention, the ranging signal is a high frequency signal that is superimposed on top of the transmitted data signal from the OLT.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: March 29, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Theo W. M. Mosch, Pieter H. van Heyningen