A comparative examination of the crosstalk induced by XPM as a result of the 5OD coefficient in SCM-WDM communication system

This research investigates the impact of cross phase modulation (XPM) caused crosstalk due to higher order dispersion (HOD) within subcarrier multiplexed wavelength-division multiplexed (SCM–WDM) communication systems across different optical power levels, modulation frequencies and transmission lengths. We carried out an analytical comparison of XPM induced crosstalk due to 5 ^th order dispersion (5OD) coefficient using nonlinear Schrödinger equation (NLSE) and couple equations in SCM–WDM communication links. It is noted that when transmission lengths, optical powers, and modulation frequencies grow, XPM-induced crosstalk has been shown to increase exponentially. Though less significant than 2OD, the effects of 3OD, 4OD, and 5OD coefficients are nonetheless present. It can be further noted that the analysis of XPM crosstalk through NLSE is reliable compared to couple equations, as only a single approximation method has been utilized to reach this conclusion using NLSE. Consequently, the results derived from NLSE are definitive and precise. The XPM crosstalk associated with the 5OD parameter ranges from (-280dB to -255.09dB) when using couple equations, while it fluctuates between (-315dB to -270dB) when employing NLSE as the modulation frequency increases from 0.4 to 5GHz. Additionally, XPM crosstalk is observed to be between (-320dB to -281dB) with couple equations, whereas it escalates from (-346.03dB to -297dB) when using NLSE as the transmission length extends from 3 to 50 km. Furthermore, XPM crosstalk varies from (-270.1dB to -240.2dB) with couple equations, while it is found within the range of (-295.1dB to -255.06dB) using NLSE as the optical power changes from 0.1 to 2mW.