Performance Evaluation of Downlink Design Based on Free Space Optical System A. A. Anis, C.B.M. Rashidi, A. K. Rahman, S.A. Aljunid and S. Yaakob MATEC Web Conf., 140 (2017) 01001 Published online: 11 December 2017 DOI: 10.1051/matecconf/201714001001