Two-Branch Fiber Link for International Clock Networks

TL;DR

This paper demonstrates a two-branch fiber link system for precise international clock comparisons, achieving high stability and low uncertainty over nearly a month of operation.

Contribution

It introduces a novel two-branch fiber link architecture for multi-partner clock comparisons with detailed stability and uncertainty analysis.

Findings

90% uptime over one month

Frequency transfer uncertainty of 2 x 10^-19

Effective multi-partner clock comparison capability

Abstract

We present our work on realizing two-branch fiber links enabling multiple-partner clock comparisons in Europe. We report in detail on the setup connecting two long haul links, and report for the relative frequency stability and accuracy. We report on a combined uptime of 90% for our dual-branch link during almost one month. We finally discuss the combined uncertainty contribution of the ensemble of the link architecture to a clock comparison. We show that the frequency transfer uncertainty is 2 x 10 --19 .