Analysis of Performance of FSO Link During the Months of Monsoon in Delhi, India

The FSO communication links use an open free space for transmission and thus must be designed to withstand the atmospheric challenges which affect the capacity of the system. Rain is one of the foreign elements which can deteriorate the performance of the link and cause huge effect on the reception of the signal. In this paper, we present a comprehensive survey of attenuation due to rain conditions in FSO link in the months of monsoon in Delhi region. The rain attenuation used for simulation of the system has been calculated by using Marshal and Palmer rain distribution model for four specific months of the rainfall, i.e., June to September. Q-factor of the received signal has been analyzed by varying the transmission wavelength, data rate, and range of the FSO system. The simulation results show that for error-free transmission of data during the months of rainfall, the transmission signal wavelength in the longer wavelength region at a wavelength around 1550 nm is recommended to be used for a maximum data rate of 2.5 Gb/s with a transmission range of 4 km.