Polarisation-channel-interleaved carrier-suppressed RZ ETDM/DWDM transmission at 40 Gbit/s with 0.8 bit/s/Hz spectral efficiency

We report experimental results of 8/spl times/40 Gbit/s polarization-channel-interleaved carrier-suppressed RZ transmission over 2/spl times/160 km NDSF, with 0.8 bit/s/Hz spectral efficiency. Average system linear Q of 6.5 (2/sup 31/-1 PRBS) and tolerance of at least 50% degradation in orthogonality were demonstrated.