All-order PMD compensation using filter theory interpretation of Poincare sphere trajectories

We have shown how polarization trajectories on the Poincare Sphere due to PMD effects can be modelled using optical lattice filter theory. Our theory shows that variation of polarisation ellipticity δ with angular frequency ω, is the cause of differential PMD degradation, whereas variation in polarisation orientation χ with ω is analogous to basic group delay and conventional chromatic dispersion. This new approach is scaleable and allows all PMD orders to be mitigated. Dynamic control of filter parameters depends on the characteristics of a global multiple loop feedback system.