Optical protection switch employing an interference filter

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

1998-01-27

2000-06-13

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359133, 359154, 359161, H04B 1018

Patent

active

060756292

ABSTRACT:
A bi-directional protection facility is provided in an optical communication system in which an optical communications node communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, and in which a filter at each node processes signals respectively received over the service and protection paths and generates an in-band signal and out-of-band signal for each of the paths. A control unit then generates a Loss of Signal indication for the service path if the level of the out-of-band signal is found to be greater than the level of the in-band signal and protection switching is effectuated as a function of the presence of the control signal. In addition, an outgoing signal to the other communications node is interrupted for a sufficient period of time to cause a LOS at that node and thus trigger protection switching thereat to complete the bi-directional switching process.

REFERENCES:
patent: 4044307 (1977-08-01), Borysiewicz et al.
patent: 5949796 (1999-09-01), Kumar

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