LEO-to-ground low elevation optical communication: optimization of an adaptive optics design robust to scintillation
Year: 2025
Type: conference-paper
Abstract: To maximize the duration of optical downlinks with Low-Earth Orbit satellites, it is crucial to ensure the coupling into the single mode fiber of the ground terminal even at low elevations. Adaptive optics systems are designed to correct the wavefront deformation induced by atmospheric turbulence. However, at low elevations, amplitude fluctuations (or scintillation) challenge this correction. Here we propose a methodology to design a wavefront sensor that is robust to scintillation, taking the Shack-Hartmann WFS as an example. We present a slope estimator able to handle the large dynamic intensity range between subapertures. We then present an end-to-end simulation of the AO system to show the decrease in wavefront measurement error brought by a finer sampling of the pupil plane. Finally, we discuss the feasibility of such design by means of a detailed AO error budget in the case of a LEO optical downlink.
DOI: 10.1117/12.3043460
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4408608210