Light guiding and electrooptical modulation in InGaAsP/InP double heterostructures

The fabrication of long rig-waveguides in the InGaAsP system with low loss suitable for integrated optics has been demonstrated. Furthermore, the authors showed, for the first time, electrooptical light modulation in Q-layers and determined the linear (Pockels effect) and quadratic (Kerr Effect) electrooptic effect. The linear electrooptic effect, r41, is independent of wavelength and composition with a value of r41=-1.4*10-10 cm/V over the limited range of measurement, which is extended in respect to earlier experiments. A strong quadratic electrooptic effect has been identified, which strongly depends on the bandgap and photon energy, as does the associated electroabsorption (Franz-Keldysh) effect.