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Atmospheric turbulence analysis and receiver chain improvement for satellite optical links

Zimer, Jean Baudouin
(2023)

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Details

Supervisors
Louveaux, Jérôme ; Oestges, Claude
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil électricien, à finalité spécialisée
Abstract
In recent years, Free Space Optical Communication (FSOC) has gained importance due to the many advantages over conventional radio frequency communication systems. FSOC is attracting particular interest from the satellite industry in order to meet the challenges of the 21st century in terms of transmissible data rate. However, the design of such communication links raises numerous difficulties because of non-idealities added by the atmosphere. Aerospacelab, which is a young Belgian company specialising in satellite production, has an experimental laboratory link and is working to develop a functional satellite-to-ground optical communication system. The aim of this thesis is to add turbulence to the experimental laboratory link in order to analyze its impact on system performance such as Signal-to-Noise Ratio (SNR) and Bit-Error-Rate (BER). This is achieved using a Variable Optical Attenuator (VOA) as turbulence generator and an eye diagram analyzer for SNR measurements. Furthermore, amplifiying and filtering is also applied on the receiver of the setup in order to decrease the minimum received power that can be analyzed. Also, two different photodetectors are investigated: an Avalanche Photodetector (APD) and a Balanced Photodetector (BPD). For this purpose, On-Off Keying (OOK) is used as reference modulation for measurements and theoretical developments. In summary, this thesis provides an analysis of the impact of turbulence on system performance and an improvement of the receiver chain.