Wavelength conversion of a 640 Gbit/s DPSK nyquist channel using a low-loss silicon nanowire

640 Gbit/s N-OTDM DPSK wavelength conversion is demonstrated in a Si-nanowire. All 64 tributaries are converted within an average power penalty of 1 dB at the FEC BER-limit 3E-3. Only 22-fJ/bit switching energy is required.