Modeling of <scp>5G</scp> Based <scp>OAM</scp> ‐ <scp>RoF</scp> System Using <scp>ZCC OCDMA</scp> Code With <scp>TDM</scp> Over Fiber‐ <scp>FSO</scp> Link

ABSTRACT A 32 GHz radio‐over‐fiber (RoF) system using integrated mode division multiplexing (MDM) and optical code division multiple access (OCDMA) scheme is realized. Quad orbital angular momentum (OAM) based zero cross‐correlation OCDMA coded signals with time division multiplexing are transmitted over hybrid fiber‐free space optics (FSO) link under the impact of clear air, haze, light, and moderate fog conditions. Simulation results depict that the system offers a maximum 0.1 km fiber and 500 m FSO range at aggregate 30 Gbps throughput. Also, the system offers acceptable bit error rate performance with a maximum 14 μm spot size, 14 cm transmitter/receiver aperture diameters, and a minimum received power of −2 dBm. Compared to existing designs, this work offers optimum system performance.