25 Gbit/s silicon based modulators for the 2 µm wavelength band

We demonstrate high-speed silicon modulators optimized for operating at the wavelength of 2 µm. The Mach-Zehnder interferometer carrier-depletion modulator has a modulation efficiency (Vπ·Lπ) of 2.89 V·cm at 4 V reverse bias. It operates at a data rate of 25 Gbit/s with an extinction ratio of 6.25 dB.