4QAM OFDM Visible Light Communication using Laser

Abstract

A visible light communication (VLC) system with 4QAM-OFDM is formed and simulated using 450 nm CW laser (CW laser) with a modulator at the input side and at the receiving side photodetector is used. VLC system Simulation is done by working on Optisystem 12, a constellation of VLC obtained at 250m/10Gbps. the benefit of CW laser along with 4 QAM OFDM improve the VLC system for free space communication Significant. With the help of CW Laser at visible frequency aspect can be seen as an advanced class of an input carrier which has the potential to accomplish data rate of high speed, high communication distance, as well as easy supervision and furnishing. By using 4 QAM OFDM we get clear constellation diagram. In this paper, we evaluate the performance of optical to electrical power conversion, Clear constellation diagram of VLC System corresponding distance from the transmitter to receiver.