Performance Analysis of WDM Coherent Optical OFDM Systems

This paper aims to exhibit the transmission performance of the optical network by integrating the advantages of both the Orthogonal Frequency Division Multiplexing (OFDM) transmission technique and the Wavelength Division Multiplexed (WDM) system. This allows for an efficient use of the bandwidth with high data rating and extends the channel usability to transmit more information like video calls, gaming, and IPTV. The performance of the model is analyzed using different matrices like Q-factor and BER. The modulation scheme is tested for a vector modulation format, i.e. Quadrature Amplitude Modulation (QAM) using OFDM sub-carriers, where an orthogonal multiplexing scheme is used. Simulations are performed with the same parameter values common to both intensity modulation schemes. Using OFDM modulation technology, 4 and 8 WDM multiplexed channel systems are simulated at a 50 GHz channel spacing, with different distances, and variable laser power. In this work, the CO-OFDM system is studied with the aim of examining the effect of the PAPR on the system performance. In order to assess the performance of the system, electrical constellation diagrams and Q-factor are calculated.