This work presents the study and conducting experiments to investigate the PMD (Polarization Mode Dispersion) effects in polarization control implemented in a single-mode fiber optic link. This study will allow the optimization of polarization controllers in transmission systems that will use polarization multiplexing (PolMux) combined with techniques like UDWDM (Ultra Dense Wavelength Division Multiplexing), and thereby to increase the transmission rate in a channel. Therefore, we performed experimental measurements showing the angular displacement of the polarization due to decorrelation between channels by analyzing the evolution of the polarization of the optical signal as a function of PMD, wavelength and the spectral spacing, analyzed using two proposals for the control of polarization, statistics of the fading channels used and also performed the calculate the correlation with the aim to analyze how these channels are related.