Patents by Inventor Tomas Valis

Tomas Valis 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).

  • WDM optical network with passive pass-through at each node
    Patent number: 6892032
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 10, 2005
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6795652
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: September 21, 2004
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6775479
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: August 10, 2004
    Assignee: Nortel Networks Corporation
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6757498
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: June 29, 2004
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6751418
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: June 15, 2004
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6748174
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: June 8, 2004
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Publication number: 20030215238
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 20, 2002
    Publication date: November 20, 2003
    Applicant: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6631018
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: October 7, 2003
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Publication number: 20030170026
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 20, 2002
    Publication date: September 11, 2003
    Applicant: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Publication number: 20030170029
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 20, 2002
    Publication date: September 11, 2003
    Applicant: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Publication number: 20030170027
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 20, 2002
    Publication date: September 11, 2003
    Applicant: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Publication number: 20030161635
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 20, 2002
    Publication date: August 28, 2003
    Applicant: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Publication number: 20030123881
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 20, 2002
    Publication date: July 3, 2003
    Applicant: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • Technique for detecting noise on a data channel
    Patent number: 6563615
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: May 13, 2003
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network and switching node with pilot tone communications
    Patent number: 6556321
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: April 29, 2003
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6529300
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: March 4, 2003
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6493117
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: December 10, 2002
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network and switching node with pilot tone communications
    Publication number: 20020126334
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Application
    Filed: December 7, 2000
    Publication date: September 12, 2002
    Applicant: Cambrian Systems Corporation to Nortel Networks Corporation
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6347000
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: February 12, 2002
    Assignee: Nortel Networks Limited
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
  • WDM optical network with passive pass-through at each node
    Patent number: 6084694
    Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: July 4, 2000
    Assignee: Nortel Networks Corporation
    Inventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon