2.56 Tb/s capacity, 0.8 b/Hz.s DWDM transmission over 120 km NDSF using polarisation-bit-interleaved 80 Gb/s OTDM signal

We report on the generation and transmission of a polarisation-bit-interleaved 80 Gb/s signal at 0.8 b/Hz.s spectral efficiency. A total capacity of 2.56 Tb/s (32/spl times/80 Gb/s) was demonstrated over 120 km NDSF with distributed Raman amplification. System linear Q values between 6.1 and 8 for 2/sup 31/-1 PRBS pattern length were achieved.