Abstract
A theoretical study of the phase modulation in InGaAsP/InP and GaAs/AlGaAs double heterostructure waveguides in the p-i-n and p-p-n-n configurations at wavelengths of 1.3 and 1.55 mu m. is reported. The carrier-induced effects (plasma, band filling, and many body) and the field-induced effects (linear electrooptic and electro-refractive) are considered to calculate the change in the refractive index. Both structures made of InGaAsP/InP show higher modulation efficiency than the corresponding structures made of GaAs/AlGaAs in almost all the cases considered due to a larger index change in InGaAsP as its bandgap wavelength is closer to both 1.3 and 1.55 mu m. >
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