Title:
OPTICAL DATA TRANSMISSION METHOD AND APPARATUS
Document Type and Number:
WIPO Patent Application WO/2015/052468
Kind Code:
A8
Abstract:
A routing and wavelength assignment method for use in an optical fibre network, comprising (i) identifying a path between each node pair in the network, (ii) identifying a block of spectral resource within the spectrum band of the identified path of a selected node pair, (iii) calculating a spectrum entropy value of the identified path of the selected node pair based on a logarithm of the ratio of the number of wavelength channels in each of the one or more blocks, to the total number of wavelength channels across the spectrum band, (iv) iterating steps (ii) and (iii) in respect of each of the paths between each other node pair in the network, until a spectrum entropy value of all the paths between all the node pairs has been calculated, (v) summing the spectrum entropy value of all of the paths between all of the node pairs to obtain a network spectrum entropy value in respect of a network configuration based on the paths between the node pairs, and (vi) determining from the network spectrum entropy value whether a signal carrying a demand through the network is separated from any other signals by a spectral gap sufficient to accommodate a change in the demand to an expected level.
Inventors:
WRIGHT PAUL DANIEL (GB)
LORD ANDREW (GB)
PARKER MICHAEL CHARLES (GB)
LORD ANDREW (GB)
PARKER MICHAEL CHARLES (GB)
Application Number:
PCT/GB2014/000404
Publication Date:
February 16, 2017
Filing Date:
October 10, 2014
Export Citation:
Assignee:
BRITISH TELECOMM (GB)
International Classes:
H04J14/02
Attorney, Agent or Firm:
LIDBETTER, Timothy Guy Edwin et al. (GB)
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