MUX/DEMUX circuit using plasmonic antennas for LiFi and WiFi uplink and downlink transmission

microring-embedded Mach–Zehnder interferometer (MZI) system is proposed to form the multiplexing (demultiplexing) for wireless and light fidelity (WiFi and LiFi) uplink and downlink transmission. The system consists of two center microrings at the transmitter and a center microring at the receiver with two small rings along the sides of the center microrings. The whispering-gallery mode (WGM) is formed by the nonlinearity effect induced by the two small rings with suitable parameters. The embedded gold gratings are excited by the WGM, where the plasmon oscillation and electron density are obtained. All possible multiplexing/demultiplexing (MUX/DEMUX) schemes based on space–time input can be applied. The transmission is performed using the tested node. The uplink and downlink input source wavelengths of 1.10 µm and 1.30 µm for LiFi and WiFi are manipulated. The manipulated tested node is employed with a maximum length of 1, 000 km away from the transmitted point via a fiber optic cable. The results obtained have shown that the optimum transmission bit rate of 2.52 Petabit s^-1 with the optimum bit error rate (BER) of 0.38 is obtained.