Bit-error rate performance of super-Nyquist-WDM DP-QPSK signals with duobinary-pulse shaping

We experimentally investigate crosstalk characteristics of Super-Nyquist-WDM DP-QPSK signals with duobinary-pulse shaping. The bit-error rate performance of 100-Gbit/s-class duobinary-pulse shaped DP-QPSK WDM signals with frequency spacing of 25 GHz is evaluated experimentally.