en 2-Semiconductor Devices Semiconductor Devices Research Paper Research Paper <span style="font-size:10.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif">Long-haul optical communication systems face challenges from nonlinear impairments, chromatic dispersion, and signal attenuation, which can degrade performance over long distances. To address these limitations and enhance transmission quality, this study introduces a 64-channel DenseWavelength Division Multiplexing (DWDM) system. This system integrates Raman Fiber Amplifiers (RFA) and Dispersion Compensating Fibers (DCF) and achieves significant signal improvements. Specifically, a 15% increase in Q-factor and a 30% reduction in Bit Error Rate (BER) are observed. At 600 km and 15 Gbps, the Q-factor rises from 5.9 to 6.5, and the BER falls from 6.1 &times; 10?7 to 2.3 &times; 10?7. Channel 64 demonstrates exceptional performance, reaching a peak Q-factor of 26.0374, exceeding all other channels. The efficacy of this hybrid RFA + DCF system is evident in mitigating nonlinear effects such as Self-Phase Modulation (SPM) and Four-Wave Mixing (FWM), and in improving Optical Signal-to-Noise Ratio (OSNR). These advancements pave the way for high-performance, long-distance optical communication, with potential for further optimization through Raman-EDFA hybrid amplification and channel spacing adjustments.</span></span> Long-haul Optics, Dense Wavelength Division Multiplexing (DWDM), Raman Amplification, Bidirectional Optical Fibre Communication, Dispersion Compensating Fibre (DCF). 3850 3850 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-5766-1&slc_lang=en&sid=1 Usman Masud usmanmasud123@hotmail.com 1800319475328460017648 1800319475328460017648 No Department of Electrical Engineering and Computer Science, PIMSAT Abdul Razzaq abdul.farooqi@uni-rostock.de 1800319475328460017649 1800319475328460017649 No Institute of General Electrical Engineering, University of Rostock: Rostock, Mecklenburg-Vorpommern, 18051 Rostock Faraz Akram faraz.akram@riphah.edu.pk 1800319475328460017650 1800319475328460017650 No Department of Biomedical Engineering, Riphah International University,Islamabad, 44000, Islamabad, Pakistan. Ahmad Zeeshan ahmad.zeeshan@iiu.edu.pk 1800319475328460017651 1800319475328460017651 Yes Department of Mathematics and Statistics, FoS, International Islamic University Islamabad, H-10, Islamabad, 44000, Pakistan.