Impact of RZ-DQPSK Modulation Generation Method on FSO Link Performance in Turbulent Environments

Free-Space Optical (FSO) communication is a promising solution for high-speed data transmission, yet its performance can be significantly affected by atmospheric conditions. This study investigates the impact of Return to Zero-Differential Quadrature Phase Shift Keying (RZ-DQPSK) modulation generation methods on FSO link performance under turbulent environments. Two distinct RZ-QDPSK transmitter schemes, one employing a serial configuration and the other utilizing a parallel configuration, are rigorously analyzed. Through the simulations under OptiSystem 14, the performance of these transmitters has been assessed, providing insights into their efficacy and suitability in challenging FSO scenarios. The study demonstrates the superiority of the parallel configuration in maintaining lower Bit Error Rates (BER) ensuring resilient communication and extending the operational range of the system. The findings underscore the significance of strategic modulation scheme selection for optimizing FSO system performance in challenging environmental conditions.