Impact of Varying Laser Power in WDM Transmission Systems to Control Nonlinear Effects

This study investigates how varied CW laser power broadcasts affect a sixteen-channel DWDM system. Constant transmission distance is sixty kilometers. The system can handle 0.649 Tbps. Launch power ranging from 0 to 10 dBm is studied to observe its effects on signal quality, crosstalk, and system efficiency. The QF assessment data shows that greater power levels boost optical signal-to-noise ratio (OSNR) and Q-factor. This improvement occurs at lower power levels. Compared to ambient noise, the signal is stronger. Due to increasing OSNR, Q-factor improves with power. When nonlinear effects become evident, progress may stagnate. Increased power levels may increase nonlinear processes including stimulated Brillouin scattering (SBS), four-wave mixing (FWM), and self-phase modulation (SPM). The Q-factor may decrease due to signal distortion and noise. According to the Bit Error Rate (BER) parameter, greater power increases signal intensity, which improves OSNR and reduces mistakes. Thus, BER drops. To increase an optical communication system's performance, laser power must be balanced to maximize the Q-factor, minimize the bit error rate (BER), and prevent substantial nonlinear aberrations.