Orthogonal modulation enabled OAM-VLC supported system incorporating multicolor lasers and multicast overlay

Abstract The concept of orbital angular momentum (OAM), often known as “twisted light,” has attracted a lot of attention in recent years due to its potential utilization in fiber-based and free-space (fiberless) optical communication systems. Despite the lack of research on Red/Green/Blue laser diodes (RGB LDs) combined with OAM, this new strategy has tremendous potential for improving visible light communication (VLC). This study introduces a 9 × 10 Gbps VLC system that combines RGB LDs with OAM beams using orthogonal modulation. Laguerre–Gaussian (LG) modes LG 0 , 0 , LG 14 , 0 , and LG 40 , 0 are the three OAM beams that are used in the proposed arrangement. Differential phase shift keying (DPSK) is employed to perform multicast data transfer at the rate of 20 Gbps. This study compares the Log BER performance of unicast polarization shift keying (PolSK), multicast DPSK, and unicast nonreturn-to-zero (NRZ) schemes across different VLC transmission ranges. Results revealed that the combination of LG 0 , 0 and RED-LDs offered enhanced bit error rates (BER) as compared to higher order OAM beams. The proposed system can successfully covered ≥1.3 m VLC link within the acceptable BER limits (≯10 −9 ).