20.4-Tb/s (204 × 111 Gb/s) Transmission over 240 km Using Bandwidth-Maximized Hybrid Raman/EDFAs

We demonstrate 20.4-Tb/s (204×111-Gb/s) transmission over 240 km (3×80 km) using CSRZ-DQPSK format and gain-flattened hybrid Raman/EDFAs. The bandwidth of the amplifiers is maximized to 10.2 THz using phosphorous co-doped silicate EDFAs.