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We demonstrate a cascaded optical link for ultrastable frequencydissemination comprised of two compensated links of 150 km and a repeaterstation. Each link includes 114 km of Internet fiber simultaneously carryingdata traffic through a dense wavelength division multiplexing technology, andpasses through two routing centers of the telecommunication network. Theoptical reference signal is inserted in and extracted from the communicationnetwork using bidirectional optical add-drop multiplexers. The repeater stationoperates autonomously ensuring noise compensation on the two links and theultra-stable signal optical regeneration. The compensated link shows afractional frequency instability of 3 \times 10-15 at one second measurementtime and 5 \times 10-20 at 20 hours. This work paves the way to a widedissemination of ultra-stable optical clock signals between distantlaboratories via the Internet network.

Cascaded multiplexed optical link on a telecommunication network for frequency dissemination