1.14 b/s/Hz spectrally-efficient 50 × 85.4 Gb/s transmission over 300 km (75 km × 4 spans) of NZ-DSF has been successfully demonstrated with copolarized CS-RZ DQPSK signals. 42.7 Gsymbol/s-based 4 Tb/s DQPSK transmission has been achieved for the first time without polarization multiplexing.

© 2004 Optical Society of America

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