Free-space coherent optical communications have a potential application to offer last mile bottleneck solution in future local area networks (LAN) because of their information carrier, information security and license-free status. Coherent optical communication systems using orthogonal frequency division multiplexing (OFDM) digital modulation are successfully demonstrated in a long-haul tens Giga bits via optical fiber, but they are not yet available in free space due to atmospheric turbulence-induced channel fading. Adaptive optics is recognized as a promising technology to mitigate the effects of atmospheric turbulence in free-space optics. In this paper, a free-space coherent optical communication system using an OFDM digital modulation scheme and adaptive optics (FSO OFDM AO) is proposed, a Gamma-Gamma distribution statistical channel fading model for the FSO OFDM AO system is examined, and FSO OFDM AO system performance is evaluated in terms of bit error rate (BER) versus various propagation distances.
Chueh Ting, Chengyu Zhang, and Zikai Yang, "Atmospheric free-space coherent optical communications with adaptive optics," Proc. SPIE 10096, Free-Space Laser Communication and Atmospheric Propagation XXIX, 1009606 (Presented at SPIE LASE: January 30, 2017; Published: 24 February 2017); https://doi.org/10.1117/12.2254009.
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