Integration of Visible Light Communication and Fiber Communication System

In this paper, we present an integrated fiber and visible light communication (VLC) system with both single and multimode fibers. Before establishing the fiber-VLC link, we implement a fiber link alone and achieve least BER for a particular length of the fiber. This fiber length is taken as an optimum performing link. The main performance measure utilized in this paper is the Bit Error Rate (BER). Optimum performance is achieved at the point of minimum BER. For an optimum performing fiber-VLC link, the dispersion is analyzed and the compensation of chromatic dispersion is done using ideal dispersion compensation Fiber Bragg Grating (FBG). Utilizing the Gray coded input sequence instead of direct binary sequence reduces the BER, since adjacent constellation points will only differ in one bit. The BER results for 16 QAM (Quadrature Amplitude Modulation) and 64 QAM using Orthogonal Frequency Division Multiplexing (OFDM) are compared for both single mode fiber and multimode fiber links. The simulation results show that for Single Mode Fiber-VLC (SMF-VLC) link the dispersion compensation is better when compared to the Multi Mode Fiber-VLC (MMF-VLC) link.