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The development of communication services in remote rural areas is difficult to using cable-based systems such as DSL (Digital Subscriber Line) and FTTx. One solution to solve this problem is to use a wireless system such as radio communication. FSO (Free Space Optic) communication system is a better choice compared to radio communication because the flexibility of frequency usage. One of the problems of the FSO communication system is the range not too far. The range of the FSO can be increased by space diversity method. In this study compared FSO systems that not use space diversity and FSO systems that use space diversity in three weather conditions namely clear, haze and fog. In taking data results using Kim model propagation with variations in the range between 100 – 2000 meters. The modulation used in this study is external modulation. The result of analysis of FSO performance after adding space diversity, the range of FSO increases as far as 1200 meter when clear condition. When haze conditions, FSO range increase as far as 800 meters. During fog condition, FSO range has increased as far as 300 meters. By adding space diversity, Q-factor value has increased and BER (Bit Error Rate) has decreased.
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