Dual Channel Indoor VLC System Using PDM Scheme: An Investigation

In this work, a phosphorescent white LED (PWLED) based dual-channel indoor Visible Light Communication (VLC) system is presented. The proposed system achieves an aggregate data rate of 2.5 Gbps for a transmission distance of 3 m with the help of an optimized lattice pre-equalizer and 2 × 2 Polarization Division Multiplexing (PDM) for a Non-Return to Zero On–Off Keying (NRZ-OOK) modulation format. The 2 × 2 polarization multiplication scheme is achieved with a pair of linear polarizers, and the transmission performance of 1.25 Gbps is achieved independently for both channels with Bit Error Rate (BER) of 1.818 e −17 and 2.967 e −16 for the first and second channel, respectively, satisfying the Forward Error Correction (FEC) limit. The crosstalk between polarization based OOK signals is deliberated. Further, the performance features of transmission wrapping of the only one polarization and both polarization states are clarified. Finally, the manifestation of the polarizer in the system is also emphasized. As yet, it is the maximum data rate triumphed in OOK modulated VLC system using PWLED.