150 Gbit/s real-time Nyquist pulse transmission Over 150 km SSMF enhanced by DSP with dynamic precision

A real-time optical Nyquist pulse transmitter generates 150 Gbit/s PDM-64QAM data with 12 bit/s/Hz spectral efficiency. A 64-tap FIR pulse shaper improves the BER by adjusting the DSP accuracy dynamically from 6 to 11 bit.