5 papers
Brillouin amplification in phase coherent transfer of optical frequencies over 480 km fiber
O. Terra, G. Grosche, H. Schnatz
We describe the use of fiber Brillouin amplification (FBA) for the coherent transmission of optical frequencies over a 480 km long optical fiber link. FBA uses the transmission fib…
Long-distance remote comparison of ultrastable optical frequencies with 1e-15 instability in fractions of a second
Andre Pape, Osama Terra, Jan Friebe +8
We demonstrate a fully optical, long-distance remote comparison of independent ultrastable optical frequencies reaching a short term stability that is superior to any reported remo…
Phase- coherent comparison of two optical frequency standards over 146 km using a telecommunication fiber link
Osama Terra, Gesine Grosche, Katharina Predehl +5
We have explored the performance of two "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. The two fibers, linking the Leibniz Un…
Optical frequency transfer via 146 km fiber link with 10^{-19} relative accuracy
G. Grosche, O. Terra, K. Predehl +5
We demonstrate the long-distance transmission of an ultra-stable optical frequency derived directly from a state-of-the-art optical frequency standard. Using an active stabilizatio…
Measurement noise floor for a long-distance optical carrier transmission via fiber
G. Grosche, O. Terra, K. Predehl +6
We investigated the measurement floor and link stability for the transfer of an ultra-stable optical frequency via an optical fiber link. We achieved a near-delay-limited instabili…