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Adaptive optics assisted space-ground coherent optical links: ground receiver performance with digital phase locked loop

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Abstract

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.
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Dates and versions

hal-02337519 , version 1 (20-07-2021)

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Cite

Laurie Paillier, Jean-Marc Conan, Raphaël Le Bidan, Géraldine Artaud, Nicolas Védrenne, et al.. Adaptive optics assisted space-ground coherent optical links: ground receiver performance with digital phase locked loop. International Conference on Space Optical Systems and Applications, Oct 2019, Portland, Oregon, United States. ⟨10.1109/ICSOS45490.2019.8978983⟩. ⟨hal-02337519⟩
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