High-resolution optical frequency dissemination on a telecommunication network with data traffic

Abstract

We transferred the frequency of an ultra-stable laser over a 108 km urban fiber link comprising 22 km of optical communications network fiber simultaneously carrying Internet data traffic. The metrological signal and the digital data signal are transferred on two different frequency channels in a dense wavelength division multiplexing scheme. The metrological signal is inserted into and extracted from the communications network by using bidirectional off-the-shelf optical add-drop multiplexers. The link-induced phase noise is measured and cancelled with round-trip technique using an all-fiber-based interferometer. The compensated link shows an Allan deviation of a few 10-16 at one second and below 10-19 at 10,000 seconds. This opens the way to a wide dissemination of ultra stable optical clock signals between distant laboratories via the Internet network.

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• Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock
• Long-distance frequency transfer over an urban fiber link using optical phase stabilization
• 86-km optical link with a resolution of 2.10-18 for RF frequency transfer
• Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer

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• Two-Way Optical Frequency Comparisons Over 100km Telecommunication Network Fibers
• An agile laser with ultra-low frequency noise and high sweep linearity
• First industrial-grade coherent fiber link for optical frequency standard dissemination
• Colloquium: Comparison of Astrophysical and Terrestrial Frequency Standards
• Hybrid fiber links for accurate optical frequency comparisons
• Feasibility of giant fiber-optic gyroscopes
• Long-distance remote comparison of ultrastable optical frequencies with 1e-15 instability in fractions of a second
• Enhanced phase noise reduction in localized two-way optical frequency comparison