 6]. Scientific investigators from all over the world are introducing cutting-edge technologies like intelligent systems such as artificial intelligence (AI)/machine learning (ML), quantum computing for quantum information processing, quantum communication for secured communication of information, blockchain, photonic-Tera-Hertz com- munication, the Internet of Everything (IoE), quantum machine learning and others as key technologies in the realization of beyond 5G (B5G) and 6G communications [7-12]. Figure 10.1 summarizes the evolution of different communication generations and the associated technologies. The generation of the cellular communication system started in the year 1980 with the introduction of 1st generation (1G) communication. With a gap of every 10 years, the 2nd generation (2G) and 3rd generation (3G) were introduced in 1990 and 2000, respectively. The 4th generation (4G) emerged in the year 2010 with extraordinary Above 1Tbps data rate Digitized world with Block Chain. Machine Learning, Quantum Communication Quantum Computing 1-10 Gbps Digital Video Artifical Intelligence Broadcasting, 2 Mbps LAS-CDMA, WCDMA 100-1000 Mbps OFDM,UMB OFDMA HSDPA 3.25G QPSK, QAM HSUPA 3.5G Fully Digitalized 64 Kbps System HSPA - 3.75G Intelligent Internet 2.4 Kbps Connection Mobile Smart World Application Applications Voice Human to Human Human to Object Object to Object FIGURE 10.1 Evolution of different generations of communication systems. Role of Photonics for Future 6G facilities of internet data streaming, voice, picture, and video communication, online mobile gaming, internet banking, online shopping, the connection of smart gadgets, and the like. By 2020 some 5G communication came into the limelight showing some remarkable advancements. Still, there is a scope for improvement in terms of security, the implementation of intelligent connectivity, object to object connectivity, visible light communication, and SO forth, which can be enhanced by 6G communication. The purpose of 6G is to fulfil the expectations o