A coherent optical link through the turbulent atmosphere

TL;DR

This paper demonstrates a 5 km free-space coherent optical link through turbulent atmosphere, analyzing phase noise and discussing implications for satellite Doppler ranging and long-distance frequency transfer.

Contribution

It presents the first implementation of a coherent optical link over 5 km through turbulent atmosphere with detailed phase noise analysis.

Findings

Phase noise mainly caused by atmospheric turbulence and mechanical vibrations.

Successful demonstration of coherent optical communication over 5 km.

Implications for satellite Doppler ranging and frequency transfer applications.

Abstract

We describe the realization of a 5 km free space coherent optical link through the turbulent atmosphere between a telescope and a ground target. We present the phase noise of the link, limited mainly by atmospheric turbulence and mechanical vibrations of the telescope and the target. We discuss the implications of our results for applications, with particular emphasis on optical Doppler ranging to satellites and long distance frequency transfer.