Transmission performance of FSO using 2μm wavelength laser

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.