Extraction of feed forward information for polarization mode dispersion compensation

In order to get the polarization mode dispersion feed-forward information,a real-time estimation model for the first and second polarization mode dispersion was presented,by means of which the first and second polarization mode dispersion(PMD) value and orientation can be determined.The results of PMD value by numerical simulation are similar to that estimated by Jones matrix when differential group delay is less than a bit period.The PMD vector from our model will give the feed-forward information for high order PMD compensation.The result is useful for the design of feed forward compensation of PMD.