System and method for reducing polarization dependent loss
AssigneeFujitsu Limited
InventorsOlga I Vassilieva, Youichi Akasaka
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Abstract
A method is provided for reducing polarization dependent loss experienced by an optical signal comprises monitoring a power level of a polarization multiplexed optical signal. The method further comprises detecting a power spike based on the monitored power. The power spike is induced by misalignment of a polarization component axis of the optical signal with a polarization dependent loss (PDL) axis of one or more network elements. The method further comprises rotating the polarization orientation of the optical signal such that the power spike is reduced.
Claims18
A method for reducing polarization dependent loss experienced by an optical signal comprising:
- monitoring a power level of a polarization division multiplexed optical signal after the optical signal leaves one or more polarization dependent loss (PDL) inducing components;
- detecting a power spike based on the monitored power, the power spike induced by misalignment of a polarization component of the optical signal with a PDL axis associated with the one or more PDL inducing components;
- and rotating the polarization orientation of the optical signal before the optical signal reaches the one or more PDL inducing components such that the power spike is reduced,
- wherein detecting a power spike further comprises detecting at least a twenty-five percent increase in the monitored power level.
A system for reducing polarization dependent loss experienced by an optical signal comprising:
- a power monitor configured to monitor power of a polarization division multiplexed optical signal after the optical signal leaves one or more polarization dependent loss (PDL) inducing components;
- a polarization controller configured to rotate a polarization of the optical signal before the optical signal reaches the one or more PDL inducing components;
- a control unit coupled to the power monitor and polarization controller and configured to:
- determine a power spike based on the monitored power, the power spike induced by misalignment of a polarization component axis of the signal with a PDL axis associated with the one or more PDL inducing components;
- and control the polarization controller to rotate the polarization orientation of the signal such that the power spike is reduced, wherein the control unit is further configured to detect a power spike based on at least a twenty-five percent increase in the monitored power level.
Dependencies are inferred from the claim text.