%0 Conference Proceedings %T Adaptive optics assisted space-ground coherent optical links: ground receiver performance with digital phase locked loop %+ DOTA, ONERA, Université Paris Saclay [Châtillon] %+ Lab-STICC_TB_CACS_COM %+ Centre National d'Études Spatiales [Toulouse] (CNES) %+ Département Communications & Electronique (COMELEC) %+ Télécommunications Optiques (GTO) %A Paillier, Laurie %A Conan, Jean-Marc %A Le Bidan, Raphaël %A Artaud, Géraldine %A Védrenne, Nicolas %A Jaouën, Yves %< avec comité de lecture %( 2019 IEEE International Conference on Space Optical Systems and Applications (ICSOS) %B International Conference on Space Optical Systems and Applications %C Portland, Oregon, United States %8 2019-10-14 %D 2019 %R 10.1109/ICSOS45490.2019.8978983 %K Digital phase-locked loop %K Coherent %K Low earth orbit %K Carrier synchronization %K Downlink %Z Engineering Sciences [physics]/Optics / PhotonicConference papers %X Combination of phase modulation with coherent detection for low Earth orbit satellite-to-ground optical links is currently investigated to meet the current high-data-rate increasing demand. On the downlink, the signal carrier undergoes a large Doppler frequency shift which may in turn severely hinders demodulation and information recovery. We present a coherent receiver architecture which combines adaptive optics correction, to mitigate the atmospheric turbulence detrimental effect, with a digital carrier synchronization system. The latter is based on a phase-locked loop which ensures the compensation of the residual frequency shift that remains after preliminary coarse frequency offset correction. We describe the methodology followed to design such a digital phase-locked loop. As an example, we show that the digital PLL is able to compensate a residual frequency mismatch of 300MHz with a convergence time inferior to 1s which is reasonable compared to the duration of the satellite pass. %G English %2 https://telecom-paris.hal.science/hal-02337519/document %2 https://telecom-paris.hal.science/hal-02337519/file/DOTA21130_preprint.pdf %L hal-02337519 %U https://telecom-paris.hal.science/hal-02337519 %~ UNIV-BREST %~ INSTITUT-TELECOM %~ ONERA %~ CNRS %~ UNIV-UBS %~ ENST %~ CNES %~ TELECOM-PARISTECH %~ LAB-STICC %~ LAB-STICC_TB %~ LAB-STICC_IMTA_CACS_COM %~ LTCI %~ COMELEC %~ GTO %~ PRACOM %~ IP_PARIS %~ INSTITUTS-TELECOM %~ IP_PARIS_COPIE %~ TEST-HALCNRS %~ GS-GEOSCIENCES %~ GS-PHYSIQUE