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Abstract: This review presents a comprehensive analysis of fibre optical communication channels for 5G networks with a specific focus on the use of multi-modulation techniques to meet the stringent requirements of high data rate, low latency, and enhanced spectral efficiency. Fibre optic links form the backbone of 5G fronthaul, midhaul, and backhaul infrastructures, where advanced modulation schemes such as QAM, OFDM, PAM, and hybrid modulation approaches are employed to support massive bandwidth demand and diverse service scenarios. The review examines the impact of channel impairments including dispersion, nonlinearity, and noise on different modulation formats, and discusses performance trade-offs in terms of bit error rate, transmission distance, and system complexity. Furthermore, recent research trends, challenges, and future directions in integrating multi-modulation techniques with fibre-based 5G communication systems are highlighted to provide insights for next-generation high-capacity and energy-efficient optical networks.