Two-Way Optical Frequency Comparisons Over 100km Telecommunication Network Fibers
Abstract
By using two-way frequency transfer, we demonstrate ultra-high resolution comparison of optical frequencies over a telecommunication fiber link of 100 km operating simultaneously digital data transfer. We first propose and experiment a bi-directional scheme using a single fiber. We show that the relative stability at 1 s integration time is 7 10^18 and scales down to 5 10^21. The same level of performance is reached when an optical link is implemented with an active compensation of the fiber noise. We also implement a real-time two-way frequency comparison over a uni-directional telecommunication network using a pair of parallel fibers. The relative frequency stability is 10^15 at 1 s integration time and reaches 2 10^17 at 40 000 s. The fractional uncertainty of the frequency comparisons was evaluated for the best case to 2 10^20. These results open the way to accurate and high resolution frequency comparison of optical clocks over intercontinental fiber networks.
Keywords
Cite
@article{arxiv.1408.4989,
title = {Two-Way Optical Frequency Comparisons Over 100km Telecommunication Network Fibers},
author = {Anthony Bercy and Fabio Stefani and Olivier Lopez and Christian Chardonnet and Paul-Eric Pottie and Anne Amy-Klein},
journal= {arXiv preprint arXiv:1408.4989},
year = {2015}
}