Time transfer over 1900 km of DWDM network

Since a dedicated optical infrastructure for atomic clock comparison is extremely expensive, we present our tests allowing sharing optical DWDM network. We expanded optical reach of our atomic clock comparison system and demonstrated the transfer of time information over 1900 km of DWDM system with other 8 neighbouring optical channels. NRENs have good potential to host time comparison applications for the academic community over long distances.