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Optical fiber links are known as the most performing tools to transferultrastable frequency reference signals. However, these signals are affected byphase noise up to bandwidths of several kilohertz and a careful data processingstrategy is required to properly estimate the uncertainty. This aspect is oftenoverlooked and a number of approaches have been proposed to implicitly dealwith it. Here, we face this issue in terms of aliasing and show how typicaltools of signal analysis can be adapted to the evaluation of optical fiberlinks performance. In this way, it is possible to use the Allan variance asestimator of stability and there is no need to introduce other estimators. Thegeneral rules we derive can be extended to all optical links. As an example, weapply this method to the experimental data we obtained on a 1284 km coherentoptical link for frequency dissemination, which we realized in Italy.

Avoiding Aliasing in Allan Variance: an Application to Fiber Link Data Analysis