Performance investigation of MZM based RoF link by employing Digital and Analog data transmission

In current scenario, need of effective wireless transmission increases rapidly, which can be fulfilled by Radio over Fiber (RoF) link. When an RoF link is designed to transmit both analog and digital data, the performance of the link is totally changed, providing optimum benefits in each transmission. In this paper, the performance of both digital and analog data transmission over different fiber lengths has been investigated in which digital signal is generated through NRZ line coding and analog signal is transmitted at 10 GHz frequency by employing Mach Zehnder Modulator (MZM). The performance of digital RoF link is analyzed through eye patterns which show Bit Error Rate (BER) and Quality factor (Q-factor) of the received signal. The findings of digital data transmission are obtained which shows that Q-factor varies from 22.04 dB to 21.23 dB for fiber length 1km to 30km. The performance of analog data transmission is analyzed through peak Signal-to-Noise Ratio (SNR) value and the peak SNR value is obtained, which varies from -95.30 dB to -106.31 dB for fiber length 1km to 30km. The reduction in SNR has been found as 11.01 dB concerning the optical fiber impairments from 1km to 30km.