Optical protection switch employing an interference filter

Details Optical protection switch employing an interference filter Optical protection switch employing an interference filter

H - Electricity

04

B

H04B 10/08 (2006.01) H04B 10/00 (2006.01) H04B 10/24 (2006.01) H04L 1/22 (2006.01)

Patent

CA 2252209

A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, in which a filter filters signals respectivelyreceived over the service and protection paths and generates a main signal and a complementary signal for each of the paths. A control unit then generates a Loss of Signal (LOS_A) indication for the service path if a SUM signal or DIFF signal respectively derived as a function of a sum of the main and complementary signals generated for the service path and difference between the main and complementary signals generated for the service path is less than a respective threshold value. A switch then invokes protection switching responsive to the presence of the LOS_A indication.

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