This paper proposes Mode Division Multiplexing (MDM) of Laguerre-Gaussian (LG) mode over Free Space Optics (FSO) communication under different weather conditions to achieve the maximum possible medium range. FSO is a unique technique for the communication between the transmitted signal and the received signal. Moreover, MDM transmissions are significant interest because of the potentially high number of modes that can be used in a single optical. MDM multiplexing supporting several modes propagate through optical transmission, spatial modes in MDM are utilised as independent channels that will carry various data streams. In this study, an 8-channel MDM-FSO system has been designed and analysed in different weather conditions at 1550 nm wavelength. The simulated system has transmitted 40Gbps up for a distance of 3000-meter FSO in superbly under clear weather condition. It also transmitted 40 Gbps up for a distance of 650-meter FSO during heavy rain. The BER measure the performance of different scenario of FSO based on MDM.
