System in Healthcare Informatics TABLE 10.1 Recent Advancements in Photonics/Optical Domain for 6G Author Reported Work Zhu et al. [30] In VLC transmission, the 3D geometry-based stochastic model (GBSM) is to be preferred for indoor VLC channels which include characteristics of VLC such as space-time-frequency mobility caused by LED, high bandwidths, long paths. Mostafa Zaman Beyond 5G or 6G communication is based on IoT. Some essential Chowdhury et al. [31] issues are high capacity, more security, low power uses, and the like. RF networks alone are not able to reach our specification of 6G, SO optical wireless communication (OWC) is used with RF networks that are compatible with 5G or 6G networks. In the future IoT tactile internet is become very useful for 6G communication. Shintaro ARAI et al. [32] The generation of mobile communication is enhanced almost every 10 years. The optical wireless communication (OWC) system is work on VLC or light fidelity (Li-Fi). This VLC range is suitable for 6G communication. Rolling-shutter method is used in cameras of mobiles and helps to obtain visible light beacon (VLB) identification. Abhishek Gupta et al. [33] In 6G communication VLC and the THz frequency range plays a vital role. In the VLC range, LEDs work for transmitting data. Even though LEDs are inexpensive and widely available, the influence of ambient light from other illumination sources, as well as sunlight, can be highly unpleasant and have numerous drawbacks. For 6G communication LED fulfils spectrum requirements and is an energy-efficient device. A. Bigongiari et al. [34] In 5G or 6G communication, a radio access network (RAN) is used in the range of millimeter waves. In advance antenna beamforming and spatial multiplexing technologies are being used. Remote laser source (RLS) is realized by two laser sources having orthogonal polarization. RLS is placed in the fronthaul link up to 3 kilometers, having 50 Gbps modulation format and placed up to 10 kilometers having 25 Gbps modulation format. This integration o