Free-space optical communication systems always require a precise focusing at the receiver. Unfortunately, when the transmitted beam passes through the atmosphere the wavefront is distorted by the time variant inhomogeneity of the refractive index, causing strong fluctuations in the power coupled into single-mode fiber at the receiver. We present an optical transmission system with a Multi-Actuator Lens (MAL) capable to increase the fiber coupling efficiency from about 5% in absence of correction to the 20%. The measurements have been performed indoor with artificially generated aberrations and outdoor in a 100m horizontal link at 1550nm.
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