Electro-optic phase modulation of radiation in thin-film epitaxial GaAsP waveguides

An investigation was made of electro-optic phase modulation of laser radiation in thin-film epitaxial GaAsP waveguides. Radiation of 0.6328 and 1.15 μ wavelengths was phase-modulated at frequencies up to 5 MHz in a GaAs_0.15P_0.85, thin-film (2.9 μ thick) waveguide. The control voltages per 1 rad of phase shift were of the order of 7 and 13 V, respectively, at the two wavelengths.