Nowadays, optical fiber links are key elements in optical metrology, spectroscopy, quantumcommunication and geodesy. In geodetic Very Long Baseline Interferometry, a local maser is responsiblefor providing time and frequency reference at radiotelescope. Here, we present our recent results onfrequency dissemination using a coherent fiber link 1800 km long from Turin to Medicina and Matera,Italy. Metrological reference disseminated via fiber link improve the stability of about two order withrespect to the local H-maser clocks. This kind of dissemination paves the way to VLBI observation usinga remote clock reference on the Italian and European radio observatories.
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