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OPTICAL RELAY SYSTEM AND NETWORK CONTROL DEVICE

  • US 20120002963A1
  • Filed: 06/06/2011
  • Published: 01/05/2012
  • Est. Priority Date: 06/08/2010
  • Status: Active Grant
First Claim
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1. An optical relay system, which relays an optical signal by wavelength division multiplexing, comprising:

  • a plurality of relay devices each of which relays the optical signal; and

    a network control device which controls each of the plurality of relay devices,each of the plurality of relay devices comprising;

    a wavelength selective switch;

    a deterioration degree measuring section which measures a deterioration degree of the optical signal having each wavelength and notifies the network control device of the measured deterioration degree along with a signal ID which identifies the corresponding optical signal and a relay device ID which identifies the own relay device; and

    a regenerative repeater which regenerates the optical signal corresponding to the signal ID when a regeneration instruction comprising the signal ID is received from the network control device,the network control device comprising;

    an equipment information retaining section which retains, for each of relay device IDs, a regenerative repeater ID which identifies the regenerative repeater included in the relay device corresponding to the each of the relay device IDs and use information which indicates whether or not the regenerative repeater is in use;

    a relay path retaining section which retains, for each of signal IDs, information which identifies an order in which the optical signal is relayed by a plurality of the relay devices existing on a relay path of the optical signal corresponding to the each of the signal IDs and the relay device IDs of the plurality of the relay devices existing on the relay path of the optical signal;

    a threshold value retaining section which retains a threshold value of the deterioration degree which is allowed for the optical signal having the each wavelength;

    a deterioration degree retaining section which retains, for each of the signal IDs, the deterioration degree notified with regard to the optical signal corresponding to the each of the signal IDs, in association with the relay device ID of the relay device that has notified the deterioration degree;

    a deterioration degree collecting section which stores the deterioration degree notified from each of the plurality of relay devices in the deterioration degree retaining section in association with the signal ID and the relay device ID which have been notified along with the deterioration degree; and

    a regenerative repeater allocation management section which executes a regenerative repeater allocation processing for each of the signal IDs,wherein the regenerative repeater allocation management section is configured to, in the regenerative repeater allocation processing;

    reference the deterioration degree retaining section and the threshold value retaining section, for each of the signal IDs, to extract the relay device ID associated with the deterioration degree equal to or higher than the threshold value from the deterioration degree retaining section when the relay device that has notified the deterioration degree equal to or higher than the threshold value exists;

    identify the relay device IDs of the relay devices existing at an upstream of the relay device having the extracted relay device ID on the relay path of the optical signal corresponding to the each of the signal IDs from within the relay path retaining section;

    select the relay device ID of the relay device comprising an unused regenerative repeater among the identified relay device IDs from within the equipment information retaining section; and

    transmit, to the relay device corresponding to the selected relay device ID, the regeneration instruction comprising the signal ID of the optical signal having the deterioration degree notified as being equal to or higher than the threshold value.

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