Performance Analysis of High-Speed Optical Communication Systems Under the Impact of Four Wave Mixing

Among all non-linearities, in particular, FWM (Four Wave Mixing) is a major issue in optical communication. In this paper, an investigation has been done on the impact of FWM on the performance of high-speed optical communication systems. The analysis has been done by comparing different modulation techniques; increasing the number of bits, channels, effective area, sample per bit, length of the fiber; and reducing channel spacing. On the transmitter side, the WDM (Wavelength Division Multiplexing) system has been designed with different techniques, such as RZ (Return to Zero), NRZ (Non-Return to Zero), and On–Off modulation, a range (2–11) of channels, a range (102–17 GHz) of channel spacing, and a range (10–140 bits/s) of bit rate. The channel has been designed with a range (16–112 µm²) of effective area, and a range (70–200 km) of fiber length. The designed WDM system obtains the best value of Q-factor (Quality-factor) and BER (Bit Error Rate) at a particular point in the abovementioned range of parameters. For a range of channels (2–11), the Q-factor varies from (69.5286–36.5789). The optimized values of all the above mentioned parameters are incorporated and the system attains a Q-factor of 178.849, which is found to be best as compared to other values in the given range of the input parameters. The designed system can be extensively tested in the future for a number of other input parameters so as to implement the system in very high-speed applications.