Patents by Inventor Hiroyuki Ohde

Hiroyuki Ohde 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 subscriber line system
    Patent number: 5448388
    Abstract: An optical subscriber line system includes a multiplexer/demultiplexer unit connected to an optical transmission medium, a plurality of relay units to which subscriber terminals are connected, and a plurality of optical transmission paths optically connecting the multiplexer/demultiplexer unit and the relay units to each other. The multiplexer/demultiplexer unit includes a multiplexer/demultiplexer unit for executing a multiplexing and demultiplexing operation on a first multiplexed signal and first digital signals. The first multiplexed signal is transferred, in the form of a light signal, through the optical transmission medium. The multiplexer/demultiplexer unit includes first interface units, respectively provided for the optical transmission paths, for establishing a first interface between the first digital signals and second multiplexed light signals respectively transferred through the optical transmission paths.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: September 5, 1995
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Ohde, Noriyuki Kutsuwada