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Optical wireless communication (OWC) systems are a promising communicationtechnology that can provide high data rates into the tens of Tb/s and cansupport multiple users at the same time. This paper investigates the optimumallocation of resources in wavelength division multiple access (WDMA) OWCsystems to support multiple users. A mixed-integer linear programming (MILP)model is developed to optimise the resource allocation. Two types of receiversare examined, an angle diversity receiver (ADR) and an imaging receiver (ImR).The ImR can support high data rates up to 14 Gbps for each user with a highersignal to interference and noise ratio (SINR). The ImR receiver provides abetter result compared to the ADR in term of channel bandwidth, SINR and datarate. Given the highly directional nature of light, the space dimension can beexploited to enable the co-existence of multiple, spatially separated, linksand thus aggregate data rates into the Tb/s. We have considered a visible lightcommunication (VLC) setting with four wavelengths per access point (red, green,yellow and blue). In the infrared spectrum, commercial sources exist that cansupport up to 100 wavelengths, significantly increasing the system aggregatecapacity. Other orthogonal domains can be exploited to lead to highercapacities in these future systems in 6G and beyond

Optimum Resource Allocation in 6G Optical Wireless Communication Systems