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Laser communications appear to have potential advantage in the future global communication network. However, in the presence of atmospheric turbulence, the performance of satellite to ground links is degraded. Eventually, atmosphere causes fatal results such as the received optical power and signal to noise ratio (SNR) degradation and communication outage. In this paper, the research progress of laser...
Atmospheric turbulence leads to a stochastic process of optical intensity and phase of beam. Thus, errors of departure angle detection are induced. In the paper, a new method to modify of departure angle detection is introduced to Free Space Optical Communications. Based on the phase retrieval, the new method only needs the intensity of the image on the focal plane to calculate the revising phase...
Wavelet model is built to depict the diversified wave-front distortion. Compared to Gaussian model, the effect on pointing error is analyzed. For it is difficult to detect the wave-front distortion to the receiver, especially for long distance, a near field center power measurement method is proposed.
The binary state is the fundamental assumption to the traditional FTA. Hence, the traditional FTA gives only the binary logical analysis of product catastrophic failures. However, performance of Fiber Optical Gyroscope (FOG) will degrade with the time and it is able to perform its task with partial performance. To overcome this problem, multistate reliability analysis is presented. However, multistate...
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