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.

© 2009 Optical Society of America

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History
Original Manuscript: August 5, 2009
Manuscript Accepted: October 22, 2009
Revised Manuscript: October 8, 2009
Published: October 27, 2009

References

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3. T. Cho and K. Kim, "Effect of third-order intermodulation on radio-over-fiber systems by a dual-electrode machzehnder modulator with ODSB and OSSB signals," J. Lightwave Technol. 24, 2052-2058 (2006). [CrossRef]
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5. K. Kiasaleh, "Performance of APD-based, PPM free-space optical communication systems in atmospheric turbulence," IEEE Trans. Commun. 53, 1455-1461 (2005). [CrossRef]
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7. Y. Palaskas and Y. Tsividis, "Power-area-DR-frequency-selectivity trade-offs in weakly nonlinear active filters," in Proceedings of ISCAS, (Bagnkok, Thailand, 2003), pp. I-453-I-456.
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Author Affiliations

Wansu Lim, Tae-Sik Cho, Kiseon Kim

Gwangju Institute Science and Technology (GIST)

Changho Yun

Korea Ocean Research and Development Institute (KORDI)

Cited By

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