50Gb/s C-band GeSi waveguide electro-absorption modulator

We report C-band waveguide-integrated GeSi electro-absorption modulators with 3dB-bandwidth beyond 50GHz. The DC extinction ratio is 4.2±0.3dB with 4.4±0.6dB insertion loss and the dynamic extinction ratio is 3.0dB at 50Gb/s NRZ-OOK with a 2 V swing.