An accurate and efficient numerical tool for the analysis and design of optical feeder links

The continuous demand for higher capacities as well as wider spectral bandwidth combined with the congestion of the RF licensed spectrum has drawn the attention to free-space optical (FSO) satellite networks. The exploitation of optical frequencies in the feeder link between ground stations and satellites will extend the terrestrial optical fiber network to space reaching a full optical network. In this scenario, this paper presents an accurate and efficient numerical tool able to support the analysis and design of optical feeder links (OFL), estimating links' performance in a computational efficient, flexible and accurate way taking into account the channel impact. As example, link budgets for GEO feeder link scenarios in uplink and downlink directions have been estimated through the developed tool. Among its capabilities, the tool makes use of a more accurate link distance evaluation, compared to the conventional approximation adopted in turbulence-related expressions, as well as the exact distance showing a relevant impact on the beam wander.