wavelengths of 1.3 and 1.55 μm, has been entirely fabricated using microelectronic
techniques. The planar optical cavity has been defined by plasma etching and has a length
of 100 μm. The device, based on the thermooptic effect, is electrically driven and exhibits a
maximum modulation depths of 60%. The measured-3 dB bandwidth is 700 kHz, which is by
far the best result ever reported, to our knowledge, for thermooptic effect based modulators.