Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2006-09-19
2006-09-19
Leung, Christina Y. (Department: 2613)
Optical communications
Fault recovery
Bypass inoperative element
C398S167000, C398S030000
Reexamination Certificate
active
07110668
ABSTRACT:
A way of testing a wavelength division multiplexed (WDM) system without requiring connection to data source/sink equipment. A test signal is introduced onto a light path of interest in the system, and the test signal is monitored downstream for signal integrity. Lack of signal integrity is used to identify a fault in the lightpath. Alternatively, optical loopbacks may be used to localize and identify a fault in the lightpath. The lightpath includes a source optical node connected to a sink optical node via intermediate optical nodes. An optical signal introduced at the source node with a destination at the sink node may be looped back at any one of the intermediate nodes or the sink node to localize and identify a fault in the lightpath.
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Gerstel Ornan A.
Ramaswami Rajiv R.
Ward Robert R.
Leung Christina Y.
Tellabs Operations Inc.
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