100 Gbps DP-QPSK performance over DCF-free and legacy system infrastructure

We experimentally compare over 1000 km of G.652 fiber the performance of coherent DP-QPSK for 100 Gbps long-haul WDM transmission over DCF-free and legacy infrastructure supporting a 10 Gbps WDM system. We show that 100 Gbps DCF-free transmission over 1000 km is error-free, while legacy system is not able to carry over 1000 km a mix of 100 Gbps DP-QPSK and 10 Gbps NRZ channels.