Abstract: Due to consistently growing demand for high data rate and high speed wireless access, free space optics has emerged as a next generation high speed wireless communication technology.FSO system using multiple transceivers has several advantages such large link distance and better bit error performance. In this paper, FSO system using spatial diversity technique and three ways of optical amplifications are proposed. Performance Analysis of different amplification systems for various weather conditions is carried out. Parameters such as received power, BER and maximum achievable range are analysed. Multiple transmitter/receiver combination integrated with various amplification types enhances the performance of FSO system.

Keywords: Free Space Optics (FSO) link, Multiple TX/RX FSO, Bit error rate (BER), Preamplifier, Optical amplification