Next Generation Free-Space Optical Communication Systems

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Free-space optical communication, also known as wireless optical communication, is an important technology in future heterogeneous wireless networks. The current radio frequency based wireless networks are carrying increasing data traffic, and free-space optical communication emerges as a viable solution to the spectrum shortage and congestion problems. Free-space optical communication is a cost-effective, secure, interference-free, and license-free technology capable of delivering high speed data at gigabits per second without use of fiber optic cable. While some current generation commercial free-space optical communication systems have been deployed, they are incapable of overcoming the impairments caused by turbulence-induced fading in a power efficient manner. The communication theory of wireless optical communication is far from mature. The challenge remains to develop low-cost and low-power free-space optical communication systems capable of reliable high-speed data communication.