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AssigneeAT&T Bell Laboratories
InventorsZygmunt Haas, Craig D. Poole, Mario A. Santoro, Jack H. Winters
Estimating the term…
The polarization-dependent distortion of an optical signal transmitted through an optical fiber is reduced by aligning the polarization of the optical signal to minimize the received signal distortion. A polarization controller (a device which can change the polarization of light in an optical fiber) may be located at either the input or output end of a long haul optical fiber system and is used to align the polarization of the signal to minimize the received signal distortion. Automatic operation of the polarization controller can be obtained by using a steepest-descent method based on a distortion measure of the received signal for the optical signal transmitted through the optical fiber to generate control signals which are used to control the polarization controller.
Apparatus for use in a system in which at least one information bearing optical signal is transmitted over an optical fiber having transmission properties that are polarization-dependent, said apparatus comprising
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