Higher order PMD canceller

We studied a higher order PMD mitigation scheme, aiming at suppressing depolarized components of a compensated signal, the higher order canceller. It is composed of a simple compensator followed by a polarization controller and a polarizer. We experimentally verified that it performs better than its first stage alone. Using simulation, we addressed its impact on system to more relevant outage probability and better feedback signals. We prove, that, for a cumulative probability of CP=10^-5 at (PMD)=30 ps, it can reduce by nearly 1 dB the power penalty of a simple compensator, reaching then the 2 dB outage margin. Finally, it should be emphasized that this mitigation technique is already implemented in polarization dependent receiver and has been so far overseen as an advantage of such a structure.