Field experiment of 400-Gbps transmission in C+L-band over dispersion-shifted fiber

Dual-carrier 400-Gbps channels in C+L-band are transmitted over dispersion shifted fiber (DSF) in field for the first time. Distributed Raman amplification not accompanied by EDFA (all-Raman amplification) is used to suppress the nonlinear distortions, which strongly occur in the zero-dispersion region in C-band. The transmitted distance is 200 km and the maximum distance is expected to be 480 km, while the Raman pump power is lower than a safety level for commercial use. The field experiment demonstrates that all-Raman amplification is feasible for effective use of existing DSF links in regional optical networks.

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