85 Channel DWDM Performance Analysis and Comparison of 9.52 Tb/s Transmission for 3056 Km using DP-QAM16 with Cascaded Fiber Link and Optical Phase Conjugation

This paper explores the comparison of four dense wavelength division multiplexing (DWDM) systems using two different modulation schemes. Dual Polarization Quadrature Phase Shift Keying (DP-QPSK) and Dual Polarization 16-State Quadrature Amplitude Modulation (DP-QAM16) along with mid-span optical phase conjugation (OPC) were implemented in a multiple channel transmission system using DWDM employing the entire C-band. For both systems, a total of 85 channels were implemented with 50 GHz channel spacing and laser linewidth of 100kHz. A bit rate of 112 Gb/s was transmitted via each channel. The simulation considered a SMF-28 channel aided with DCF and EDFA. Both bit rate-distance product and spectral efficiency-distance product were compared to show the superiority of performance for the DP-QAM16 based DWDM system. Later, OPC was performed in the middle of the transmission to successfully extend the transmission distance.