Design of Green Radio Communication System for Next Generation Networks

Abstract

This paper highlights and demonstrates optical single sideband (OSSB) intensity modulation
technique in Radio over Fiber (RoF) system which can become the backbone of upcoming next
generation wireless and broadband communication networks. The RoF link consists of two tone radio
frequency signals, operated on 8GHz and 9GHz, Mach Zehender Modulator (MZM), Dual Drive
MZM (DD-MZM), optical fiber and photodetector. The severe issue in RoF transmission is
intermodulation distortions and the third order intermodulation (IM3) errors which have its spectrum
near to desired RF signals, are most performance degradation factors. This paper has its
consideration on IM3 errors and a comparative analysis is drawn to illustrate the IM3 power
variations with respect to optical modulators: MZM and DD-MZM in RoF link.The proposed model is
designed in Optsim software to confirm and validate the analysis and results. The results show that
the RoF link based on DD-MZM can reduce dBm the IM3 errors as per its bias voltages in
comparison with RoF link based on MZM.