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ESTABLISHING CONNECTIONS IN A MULTI-RATE OPTICAL NETWORK

  • US 20140023364A1
  • Filed: 10/15/2010
  • Published: 01/23/2014
  • Est. Priority Date: 09/15/2010
  • Status: Active Grant
First Claim
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1. A method of establishing a connection of a second bitrate traffic type in an optical transmission network, the network comprising nodes connected by optical links, wherein the nodes support a plurality of different wavelength channels on the links and support at least a first bitrate traffic type and the second bitrate traffic type on respective wavelength channels, the method comprising, at one of the nodes:

  • receiving first information identifying wavelengths which are available on an upstream path to the node;

    receiving second information identifying wavelengths which are available on an upstream path to the node and which are spaced, by a guard band, from wavelengths used for connections of the first bitrate traffic type, the guard band being a wavelength spacing at which the interference between a connection of the first bitrate traffic type and a connection of the second bitrate traffic type is less than a predetermined amount;

    determining a quality of transmission of a wavelength in the first information using a first quality of transmission calculation; and

    if a result of the first quality of transmission calculation is not acceptable, determining a quality of transmission of an available wavelength in the second information using a second quality of transmission calculation, wherein the second quality of transmission calculation is less stringent than the first quality of transmission calculation.

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