100 GHz RADIO SIGNAL OVER 160 GBPS-160 KM ROF LINK USING POLARIZATION DIVISION MULTIPLEXING BASED 256-QAM AND MATCHED FILTER

Abstract

High capacity communication systems are essential to meet the demand of fifth generation (5G) networks due to the sudden increase in bandwidth-hungry applications over the past few years. Radio over fiber (RoF) incorporating polarization division multiplexing (PDM) is a spectrally efficient and predominant option for high speed and prolonged reach RF enabled optical communication systems. Higher level quadrature amplitude modulations (QAMs) have narrow spectrums and perfect candidate for RoF. However, integration of PDM supported higher QAMs are not explored extensively in RoF technology. Therefore, in this research article, a 160 Gbps-100 GHz RoF system is presented over 160 km link distance by employing PDM-256-QAM and matched filter. Moreover, the eradication of dispersion, time skews, phase compensation and nonlinear effects have been performed by employing different algorithms such as blind phase search (BPS), constant modulus Algorithm (CMA), and viterbi phase estimation (VPE).The presented system is investigated for discerning the effects of different RF frequencies, input powers, matched filter bandwidths on polarization X and y in terms of log bit error rate (log BER), symbol error rate (SER), Q factor, and error vector magnitude (EVM). Results revealed that polarization exhibited better performance as compared to polarization X.