Patents by Inventor Aki Grohn

Aki Grohn 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).

  • Distribution of a synchronization signal in an optical communication system
    Patent number: 7248802
    Abstract: The invention relates to the distribution of a synchronization signal in an optical communication system which is inherently asynchronous. In order to accomplish a cost-efficient mechanism for transmitting a synchronization signal in such a system, the amplitude of a payload signal is modulated with the synchronization signal, whereby an amplitude-modulated payload signal is obtained. This amplitude-modulated payload signal is transmitted as an optical signal to the opposite end of an optical link, where the synchronization signal is separated from the payload signal.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: July 24, 2007
    Assignee: Nokia Corporation
    Inventor: Aki Gröhn
  • Distribution of a synchronization signal in an optical communication system
    Publication number: 20040101311
    Abstract: The invention relates to the distribution of a synchronization signal in an optical communication system which is inherently asynchronous. In order to accomplish a cost-efficient mechanism for transmitting a synchronization signal in such a system, the amplitude of a payload signal is modulated with the synchronization signal, whereby an amplitude-modulated payload signal is obtained. This amplitude-modulated payload signal is transmitted as an optical signal to the opposite end of an optical link, where the synchronization signal is separated from the payload signal.
    Type: Application
    Filed: November 27, 2002
    Publication date: May 27, 2004
    Inventor: Aki Grohn
  • Maintaining quality of packet traffic in optical network when a failure of an optical link occurs
    Publication number: 20040057724
    Abstract: Interworking of optical protection in an optical network and IP-layer protection in the Internet is achieved by configuring optical links to form a part of a ring network and by arranging different protection types for different links. Each optical link is provided with an appropriate protection level corresponding to the nature of Internet traffic being transmitted over the link. The highest protection level is achieved with 1+1 protection. The optical layer can offer this protection for high priority Internet traffic that does not tolerate delay. The middle and the low protection level are achieved with 1:1 protection. The low protection level of a link does not guarantee uninterrupted transmission of the Internet traffic, in case of link failure caused by a fiber cut. Optical signaling at the optical layer takes care of protection wherein the IP-layer does not know when protection actions are carried out.
    Type: Application
    Filed: July 3, 2003
    Publication date: March 25, 2004
    Inventors: Markku Oksanen, Antti Pietilainen, Ronald Brown, Aki Grohn, Reijo Juvonen, Harald Kaaja, Ari Tervonen