Patents by Inventor Jonas Hemgren

Jonas Hemgren 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).

  • Patent number: 6915075
    Abstract: An optical network comprises a bidirectional link connecting two nodes (1) through two optical fibers (3). Optical output signals from optical transmitters (7) in a node are provided to transponders (11) issuing optical signals of well-defined wavelengths to a power combiner (13), from which optical signals are forwarded to the other node on the respective fiber. The network can have protection for failures of various components. Thus, a spare transponder (21) can receive the optical output signals of an optical transmitter (7) in the case of a failure of an ordinary transponder (11). The spare transponder (21) is also connected to the combiner (13). The optical transmitters (7) and receivers (9) can be duplicated by providing spare transmitters (7?) and spare receivers (9?). Various arrangements can be used for connecting the output of a transmitter to an ordinary transponder or the spare transponder.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: July 5, 2005
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Magnus Öberg, Nigel Robert Wood, Jonas Hemgren