Abstract
We introduce multi-branch repeater laser stations (MLSs) for the dissemination of an ultra-stable signal from one point to multiple users and the simultaneous evaluation of the stability and accuracy of multiple links. We perform the study of the noise floor of this new instrument. We present then an optical fiber network of 4800 km built with three MLSs and 13 repeater laser stations (RLSs). We show the multi-user optical frequency dissemination on four links totalizing 2198 km with uncertainties below 1.1 × 10−19. The robustness of the network over two years is presented and stability and accuracy at 107 seconds integration time are finally showed.
Highlights
Introduction pte KeywordsFrequency transfer, Metrology, Fibre optic links, Laser optics, interferometer ce Optical fiber links enable the accurate and ultra-stable transfer of an optical frequency reference on distances of more than km [1,2,3,4,5]
The number and length of optical links increased in order to connect national metrological institutes (NMIs) or laboratory users and extend the possible applications
In order to transfer the signal to several points, the network includes three Multi-branch Laser Stations (MLSs)
Summary
In order to transfer the signal to several points, the network includes three Multi-branch Laser Stations (MLSs). The multi-branch low-noise interferometric ensemble (figure 2b) is designed to detect the beat-notes of the same optical phase of the laser with several external optical signals It includes several reference arms of similar optical length, each combined with an external optical port that corresponds to the second arm of a highly unbalanced Michelson interferometer, providing several phase-coherent two-arm interferometers. This noise floor was measured by connecting two optical ports of the same multi-branch interferometric ensemble, being an out-of-loop measurement This way we connect two interferometers with a short fiber, sharing the same external arm and we realize a two-way frequency comparison using the same laser source [30,31].
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