Simulation framework for classical and quantum communications over the free-space optical channel

计算机科学 量子密钥分配 自由空间光通信 地球静止轨道 电子工程 光通信 通信卫星 电信线路 卫星 电信 物理 光学 光子 工程类 天文
作者
Roza Navitskaya,Shi Li,Piotr Novik,Igor Koltchanov,André Richter
标识
DOI:10.1117/12.2648365
摘要

Free-space optical (FSO) communication has attracted significant interest recently. This technology can potentially complement or be an integral part of next-generation networks. FSO links provide several advantages compared to conventional radio frequency links, including higher data rates, license-free spectrum, and power efficiency. Furthermore, they could be used to access users in remote areas where optical fiber communications are unavailable. Here, we present a simulation framework for modeling, designing, and analyzing classical and quantum communication systems over terrestrial and satellite free-space optical links. We address different FSO use cases in terrestrial, ground-to-satellite, satellite-to-ground, and inter-satellite links using direct- and coherent detection schemes. For the FSO channel modeling, we discuss two methods. The first approach considers atmospheric scintillation, pointing errors, the Doppler effect, attenuation due to the beam diffraction, and scintillation-induced divergence. The second method captures the wavefront of the optical beam using the phase screens technique, which provides a more detailed description of the signal propagation. Additionally, we provide essential details about system-level simulations to analyze and optimize the entire link performance. Finally, we discuss the simulation environment for designing quantum-key distribution (QKD) systems as an FSO use case. Using this simulation framework, we investigate the performance of several different FSO application examples: a terrestrial link with spatial diversity receivers, inter-satellite communication from low Earth to geostationary orbit, and a polarization-encoded BB84 with decoy states QKD over a satellite downlink.
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