An energy-efficient 252 Gbit/s silicon-based IQ-modulator

With a silicon-based modulator we generate single-polarization 16QAM signals at symbol rates of 63 GBd (252 Gbit/s, 22 fJ/bit, BER = 4.1×10∼3). The experiments show a path towards Si-based 500 Gbit/s dual-polarization single-wavelength transmitters.