Comparative analysis of XPM crosstalk in radio over fiber SCM-DWDM network

Abstract

The investigation of Subcarrier Multiplexing-Dense Wavelength Division Multiplexing (SCM-DWDM) technology-based Radio over Fibre (RoF) systems is driven by the growing need for high data rates and huge channel capacity in broadband optical networks. Cross-phase modulation (XPM) crosstalk is a significant problem in these systems that gets worse with higher frequencies, longer fibre lengths, and smaller channel spacing. Using coupled equations and the nonlinear Schrödinger equation (NLSE), this study compares and analyses the performance of XPM crosstalk in the W band (75–110 GHz) and V band (40–75 GHz), considering the effects of higher-order dispersion up to the eighth order. Examining XPM-induced crosstalk over fibre lengths up to 50 km, input energies up to 20 mW, and different channel spacings are all included in the scope. The findings show that the relationship between XPM crosstalk and frequency, fibre length, and input power is exponential. In terms of reducing XPM crosstalk, the Schrödinger equation-based model performs better than the coupled equation. The optimisation of RoF systems for next-generation, high-capacity optical communication networks can be facilitated by the insights gained from this study.