Highly cascadable all-optical wavelength conversions of DP-QPSK, DP-16QAM, and DP-64QAM signals

We present for the first time 14, 10, 4 cascaded wavelength conversions of 48Gbit/s DP-QPSK, 96Gbit/s DP-16QAM, 144Gbit/s DP-64QAM, respectively. The high cascadability is due to high conversion efficiency achieved by a counter-dithering scheme with small impact of residual dithering.

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