Ring-Star based transmission over Fiber/FSO Links for Reliable Access Network Services

In this work, we propose and simulate an unidirectional Free Space Optical (FSO) or Optical Fiber (OF) link transmission with Wavelength Division Multiplexing (WDM) capability using ring and star topology. The data transmission is performed on the ring-based architecture while keeping the star-based architecture as a backup link and vice versa if fault occurs in OF or FSO links. For the proposed architecture, we compare FSO-WDM and OF-WDM network performance for ring & star-based architecture. The bit error rate (BER) performance is quite satisfactorily for feeder fiber (FF) length of
$50\text{km}$
and distributed fiber (DF)/FSO link length of
$200\mathrm{m}$
. The architecture provides the reliable high-speed data transmission and may be useful for smart rural and urban communities.