An accurate calculating method for optical power attenuation in intersatellite laser link (ISL) is presented. Based on transmission characteristics of Gaussian beam, we analyze the effect of light wavelength, transmission distance and optical antenna upon optical power, and pointing error is also taken into consideration. Compared with the usually used method, which borrowed from microwave antenna theory, this calculation method is well-founded and possessing higher accuracy.
"Study of optical power loss in intersatellite laser link", Proc. SPIE 5281, Optical Transmission, Switching, and Subsystems, (7 May 2004); doi: 10.1117/12.523363; https://doi.org/10.1117/12.523363