Performance and uses of the Refimeve metrological signal, 1000 km from the source

TL;DR

This paper evaluates the stability and phase noise of a 1542 nm metrological signal transmitted over 1000 km of French fiber network, using local laser and frequency comb measurements to assess its suitability for optical frequency metrology.

Contribution

It provides a detailed analysis of the signal's performance at long-distance transmission, highlighting its stability and phase noise characteristics for metrological applications.

Findings

Identified key phase noise timescales relevant for metrology

Demonstrated stable signal performance over 1000 km

Provided insights into long-distance optical frequency dissemination

Abstract

We present a detailed analysis of the end-user performance of the metrological signal at 1542 nm disseminated by the French national fibre network Refimeve, about 1000 km from the source. By the mean of a local ultrastable laser at 729 nm and a frequency comb, we are able to carry out stability and phase noise measurements of the signal with respect to the local laser. With a focus on phase noise analysis we identify different timescales of interest for the use of this signal in optical frequency metrology.