A fiber optic communications link having PMD characterization across multiple optical channels to identify PMD problems. The communications link has adaptive PMD controls employed along the optical link, whereby PMD phenomena detected by instruments, such as PMD compensators, are interpreted as being either attributable to perturbation of fiber characteristics at large, or by failure of PMD equipment along the link. The present invention avoids taking unnecessary control or maintenance actions upon PMD related controllers and compensators. PMD notifications from various PMD compensators are correlated to identify which portion of the link has undergone a change in polarization characteristics to further identify PMD related errors and problems.

Title
PMD characterization across multiple optical channels of an optical link
Application Number
9/993644
Publication Number
6704510 (B2)
Application Date
November 27, 2001
Publication Date
March 9, 2004
Inventor
Xiaoping Charles Mao
Plano
TX, US
Andrew Niall Robinson
McKinney
TX, US
Assignee
WorldCom
MS, US
IPC
H04J 14/02
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