Atmospheric turbulence is generated due to the continuous mixing of air temperatures and the formation of turbulent motion under the action of wind. However, the FSO links are easily affected by deleterious atmospheric turbulence effects. The above advantages make FSO a promising communication technique. Accordingly, the FSO system can be deployed in less time. Additionally, the terminals in FSO are more compact and consume less energy than those in RF. Compared to radio spectrum resources, which are highly regulated, optical frequencies are not regulated and can be readily used. Even free-space quantum optical communication can provide unconditional information security. The laser beam has a highly narrow divergence, which enables immunity against eavesdropping. In this paper, several methods associated with atmospheric coherence length measurement are reviewed.Ĭonventional radio frequency (RF) systems suffer from vulnerability to interference, bandwidth limitations, high power consumption and frequency licensing, while free-space optical (FSO) communications are not subject to these limitations. Measuring the atmospheric coherence length, as a result, is of great interest as well as importance to the FSO community. The atmospheric coherence length of FSO links reflects the atmospheric turbulence effects, and it is one of the key parameters of FSO systems. This knowledge with respect to FSO links helps to optimize the system design and reduce the adverse effects of atmospheric turbulence. After the optical signals propagate over the atmospheric channel, their wavefronts suffer from deleterious perturbation, thus resulting in degradation in the performance of the FSO. One of principal challenges that FSO faces is the susceptibility of the atmospheric channel, which is turbulent in nature. It is a promising communication technique, and could be an alternative to optical fiber communication and traditional radio frequency (RF) communication. ![]() Free-space optical (FSO) communication possesses the advantages of high security, large information capacity, high-speed transmission, small terminal size, low power consumption, easy and flexible deployment, etc.
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