HIGH-CONTRAST, LARGE OPTICAL BANDWIDTH FIELD-INDUCED GUIDE ANTIGUIDE MODULATOR

We report an electric field induced-guide/antiguide optical intensity modulator which has a very wide optical bandwidth from 1 to 1.55-mu-m (ON/OFF ratio > 13 dB from 1 to 1.55-mu-m for both TE and TM modes), which is the largest ever reported before for an intensity modulator. A TE mode ON/OFF ratio larger than 21 dB at 1.15-mu-m, and a propagation loss approximately 1 dB at 1.3-mu-m has been measured. The electro-optic effects, along with carrier effects have been exploited to increase the refractive index under the guide and adjacent antiguide electrodes by applying reverse biases to them.