Abstract:
This research “Polarization Control in Coherent QPSK Optical Transmission” mainly aims to analyze and
modify the existing polarization control algorithms, non data aided algorithm(CMA) and a data- aided
decision-directed algorithm (DPC-CMA, ORIGINAL (ODDA) & MODIFIED (MDDA)) intended for
high control speed, low complexity, phase noise and modulation format tolerance in future 100GbE
transmission. It was simulated and analyzed CMA and the extended DPC-CMA for QPSK signals. These
algorithms work under certain conditions, low cross talk and limited range of transmitting signal
amplitude. The DPC-CMA showed improved performance compared to CMA. It increases polarization
control speed by enabling common carrier recovery through differential phase compensation and it
improves the BER performance of the algorithms comparable to the existing polarization control
algorithms using VPIphotonic and Matlab softwares.
