Clock regenerating effect for NRZ data due to higher-order polarization mode dispersion

Summary form only given. We verify that the extracted clock power from the received non-return-to-zero (NRZ) data is correlated with higher-order PMD. After first-order compensation, higher clock power corresponds to a higher power penalty. Therefore, the clock power may be used for a multi-section PMD compensator as an auxiliary feedback signal. It is important to note that, when considering only first-order PMD, the clock component would not be extracted at the receiver. In contrast, the clock can be used as first-order PMD monitor for return-to-zero (RZ) data.