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For this research article, we have completed the comparative performance analysis of 128 × 40 Gbps DWDM long-haul system for the ultra-transmission capacity of 5.12 Tbps using CSRZ modulation format under the impact of Kerr’s nonlinearities with symmetrical, post and pre dispersion compensation techniques. The BER, Q-factor values and eye-diagrams are considered as performance metrics for the different power levels ranging from −4 to 8 dBm and various transmission distances with the increment of 2400 km. We have used Gaussian filters (GFs) before multiplexing and after de-multiplexing for ensuring channel separation to evade the inter-symbol interference and cross-talk. The graphical performance analysis of the proposed system has also been made with the above mentioned compensation techniques at 4, 6 and 8 dBm input powers using DCF at 50 GHz frequency spacing for the optimization of the used format. It is observed that overall, symmetrical compensation gave better-quality performance at all the power levels in comparison to pre and post schemes. Due to narrow optical spectrum of CSRZ format, the proposed system has shown consistency, resilience and toughness against the bottlenecks appeared as dispersion and nonlinearities. It has supported the transmission distance of 19,200 km at 6 dBm optimum power for symmetrical compensation with BER of 8.65E-13 against Q-factor value of 7.00 as compared to pre compensation for 14,400 km at BER of 2.28E-13 with Q-factor of 7.18 whereas post compensation technique have shown a transmission distance of 16,800 km at 8 dBm optimum launched power with BER of 1.63E-12 and Q-factor value of 6.92.

Dispersion compensation analysis of 5.12 Tbps CSRZ based long-haul DWDM system