Electro-optical light modulation in InGaAsP/InP double heterostructure diodes

Abstract
The linear electro-optic coefficient r41 was determined in quaternary double heterostructure waveguides containing a p-n junction. Over the limited range of measurements, it is independent of wavelength and composition with a value r41=−1.4×10−10 cm/V. A strong quadratic electro-optic effect has been identified for the first time, which strongly depends on the band gap and photon energy as does the associated electroabsorption effect.