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WDM optical network with passive pass-through at each node

  • US 6,775,479 B2
  • Filed: 12/20/2002
  • Issued: 08/10/2004
  • Est. Priority Date: 08/27/1997
  • Status: Expired due to Term
First Claim
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1. A method of operating a node of a communications network in which pairs of nodes are associated with distinct bands of optical channels used for communication between said pairs of nodes, each band of optical channels comprising a plurality of distinct optical channels operating at respective distinct wavelengths, the method comprising:

  • separating a selected band of optical channels from non-selected bands of optical channels and passively forwarding the non-selected bands of optical channels, the non-selected bands being separated from the selected band by at least one optical channel which is not used for communication; and

    combining a band of optical channels with the passively forwarded non-selected bands of optical channels.

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