In this paper, we propose free space optical (FSO) communication using laser light in the 2μm wavelength. FSO using the mid-infrared 2μm band can reduce the effects of turbulence and particles generated in free space and improve link performance. In addition, it has a large allowable exposure because it can be operated in a transparent window in the atmosphere or in a safety for human eyes. We will analysis link visibility, transmission characteristics and SNR of 2μm FSO, demonstrate the BER of the FSO link with fog experimentally. The theoretical analysis will show that visibility and transmission loss will be improved by 2μm FSO, and experimental results also show that BER performance can be improved about 2dB.
KEYWORDS: Analytical research, Free space optics, Atmospheric optics, Turbulence, Signal analyzers, Radio over Fiber, Radio optics, Mobile communications, Atmospheric turbulence
RoFSO technology can easily transmit radio frequency signals using optical carriers in the atmosphere. On the other hand, MIMO transmission have widely used in recent mobile communication, and there are some reports about FSOMIMO transmission. This paper demonstrates a RoFSO- MIMO transmission system which combines technologies of FSO-MIMO and RoF to enhance the flexibility of mobile front-haul. The proposed system uses pilot RF signals to estimate the FSO channel which is affected by atmospheric turbulence and so on. In this paper, we theoretically analyze RF signal quality for various turbulence conditions and show some experimental results of 2x2 RoFSO-MIMO transmission. Performance comparison results will show the effectiveness of the proposed technology.
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