Simulation of VLC system under the influence of optical background noise using filtering technique

Abstract Visible light communication (VLC) has recently gained recognition as an alternate to RF communication. Optical background noise sources generated by conventional fluorescent light, optical shot noise and thermal noise demean the performance of the VLC system. In this paper, the simulation design and performance analysis of RZ-OOK VLC system under the influence of optical background noise using optisystem software is proposed. Rectangular optical filter, placed before the photo-diode and electrical low pass Bessel filter after the trans-impedance amplifier are used to mitigate the noise. Our proposed design of indoor VLC system helps to attain the best performance with minimum cost, effort and time, after that it can be applied physically in real-time experimentation. This paper also discusses the performance analysis of optical to electrical power conversion, BER, qualitative eye opening, evaluation of BER with respect to the distance between the transmitter and receiver for RZ-OOK VLC system. Simulation results make clear that the performance of RZ-OOK modulation is better achieved for data rate of 20 Kb/s and 20m distance between the transmitter and receiver.