Transmission of hybrid 112 and 44 Gb/s PolMux-QPSK in 25 GHz channel spacing over 1600 km SSMF employing digital coherent detection and EDFA-only amplification

By using only C-band EDFAs, we have transmitted hybrid 10×112 and 10×44 Gb/s PolMux-QPSK signals in 25 GHz channel spacing over 1600-km SSMF employing digital coherent detection. The measured BER for all channels is smaller than 1.2×10⁻³.