Abstract
This study has revealed that the dominant nonlinear of four-wave mixing (FWM), shown a significant impact of performance limitation of the wavelength division multiplexing systems (WDM). The interaction and accumulation of the chromatic dispersion and the effect of the fiber nonlinear along the optical link length, are shown a limited performance of the long distance of optical communication system. Also, we investigated the relationships of FWM power with the fiber length of several values of the inter channel spacing, input power, the effective core area, number of channels in the system. The results are shown that the dominant influence of FWM at the dispersion of zero-wavelength in comparison to the end wavelength, where ultimately, it reaches the maximum value of fiber length≈ 22 km. Furthermore, it is also shown that the FWM noise power is, consequently, increased, after assembly of other factors, including, (1) the increase of the input power, (2) the number of channels in the system, (3) the decrease of the frequency spacing, effective core area.
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