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In free-space optical communication, aperture averaging effect can be used to optimize receiver design. A variety of factors contribute to aperture averaging effect, such as the receiving aperture, the light source, and the turbulence link. Cassegrain system is usually used as the receiver. It is technically feasible to optimally design the light source according to Cassegrain system's aperture averaging function and the turbulent propagation path. The aperture averaging functions of Cassegrain system and single aperture system are analyzed in this paper. The results show that the average aperture function of Cassegrain system decreases significantly. Large obscuration ratio can significantly reduce the value of K 0 function.

Aperture averaging effect can smooth the optical signal fluctuations. Generally, the aperture function is assumed to be a single circle when its aperture averaging function K 0 is calculated. In recent years, K 0 function of a complex receiving aperture is also discussed. Actually, Cassegrain system is usually used as a telescope for free-space optical communication. There is a little bit difference from the previous analysis when Cassegrain system is used to analyze aperture averaging effect. K 0 function of Cassegrain system is analyzed in this paper. The calculation result can be used to establish simulation model for optical propagation system.