2.56 Tbit/s (32×80 Gbit/s) polarisation-bit-interleaved transmission over 120 km NDSF with 0.8 bit/s/Hz spectral efficiency

Experimental results of 32/spl times/80 Gbit/s polarisation-bit-interleaved carrier-suppressed RZ transmission over 120 km of NDSF with 0.8 bit/s/Hz spectral efficiency are reported. System Q values between 6.1 and 8 (2/sup 31/-1 pattern) were achieved with the use of distributed Raman amplification and polarisation demultiplexing.