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This work proposes a hybrid ring-mesh topology basics bidirectional 4 × 40/40  Gbps integrated passive optical network/free space optics (PON/FSO) system. The system incorporates two-dimensional modified fixed right shifting (2D-MFRS) code with enhanced disaster resilience and fault protection capability especially in remote places where the primary fibre may be destroyed. The obtained results depict that proposed system supporting 250 subscribers can provides faithful hybrid 100 km fiber and 1 km FSO transmission. Also, maximum FSO range of 21 km with fixed 50 km fiber distance can be obtained concerning weak-to-strong turbulent and rain with fog weather conditions. In addition, it also offers −39 dB m receiver sensitivity and the proposed design is superb over other work.

Disaster resilience hybrid ring-mesh topology basics integrated PON/FSO system incorporating 2D-MFRS code