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Method-and-apparatus-for-capacity-efficient-restoration-in-an-optical-communication-system

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Method and apparatus for capacity-efficient restoration in an optical communication system

Details

Inventors: Chaudhuri, Sid; Cortez, Bruce Gilbert; Zelingher, Simon S.;
Assignee: AT&T Corp. (New York, NY)
Primary Examiner: Pascal; Leslie
Assistant Examiner: Phan; Hanh
Attorney, Agent or Firm:

A method and system provide capacity-efficient restoration within an optical fiber communication system. The system includes a plurality of nodes each interconnected by optical fibers. Each optical fiber connection between nodes includes at least three channel groups with different priority levels for restoration switching in response to a connection failure. The system maintains and restores full-capacity communication services by switching at least a portion of the channel groups from a first optical fiber connection to a second optical fiber connection system based on the priority levels assigned to the channel groups. Service reliability is effectively maintained without incurring additional costs for dedicated spare optical fiber equipment by improving idle capacity utilization.

DETAILED DESCRIPTION The present invention overcomes the previously mentioned disadvantages by using a hybrid protection architecture for an optical communication system comprising a plurality of interconnected nodes.
The protection scheme uses a two-line optical fiber connection for each link between nodes but is not 1:1 protection.
At least three channel groups are carried by each line wherein each channel group is assigned a different priority level for restoration.
In response to a failure on a line, channels are switched in descending priority level to available restoration channels on another line or link to maintain optical communication services connectivity.

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