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We investigate optical frequency dissemination over a 1400 km long fiber linkin looped configuration over a pair of underground fibers between Braunschweigand Strasbourg. This fiber link is the first to combine fiber Brillouinamplifiers with a repeater laser station. Phase-coherent operation over morethan five days is demonstrated. We analyze the repeatability of the performanceover four campaigns and present results of 65 days in total. The weighted meanof the fractional frequency offset of the transferred optical frequency overthe complete data set is $(-1.1 \pm 0.4) \times 10^{-20}$. By analyzing thestabilization signals of the two individual fibers, the correlation of thephase noise on the two fibers is shown to be >98%.

Combining fiber Brillouin amplification with a repeater laser station for fiber-based optical frequency dissemination over 1400 km