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Average BER analysis of SCM-based free-space optical systems by considering the effect of IM3 with OSSB signals under
Wansu Lim1, Tae-Sik Cho, Changho Yun
1Department of Information and Communications, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju 500-712 Korea. wansu99@gist.ac.kr
Abstract:
In this paper, we derive the average bit error rate (BER) of subcarrier multiplexing (SCM)-based free space optics (FSO) systems using a dual-drive Mach-Zehnder modulator (DD-MZM) for optical single-sideband (OSSB) signals under atmospheric turbulence channels. In particular, we consider the third-order intermodulation (IM3), a significant performance degradation factor, in the case of high input signal power systems. The derived average BER, as a function of the input signal power and the scintillation index, is employed to determine the optimum number of SCM users upon the designing FSO systems. For instance, when the user number doubles, the input signal power decreases by almost 2 dBm under the log-normal and exponential turbulence channels at a given average BER.
