We report on high speed operation of a Ge/SiGe multiple quantum well (MQW) electro-absorption modulator in a waveguide configuration. 23 GHz bandwidth is experimentally demonstrated from a 3 µm wide and 90 µm long Ge/SiGe MQW waveguide. The modulator exhibits a high extinction ratio of more than 10 dB over a wide spectral range. Moreover with a swing… (More)
We demonstrate a room-temperature strong quantum confinement Stark effect (QCSE) in Ge/SiGe multiple quantum wells (MQW) heterostructures, embedded in PIN diode. The device is designed to operate at 1.3μm, and QCSE is shown by photocurrent measurement in a surface illuminated device.