THE ELECTROOPTIC COEFFICIENTS OF GAAS - MEASUREMENTS AT 1.32-MU-M AND 1.52-MU-M AND STUDY OF THEIR DISPERSION BETWEEN 0.9-MU-M AND 10-MU-M

The linear (r41) and quadratic (R11 and R12) electro-optic coefficients of GaAs have been measured at the wavelengths 1.32 and 1.52-mu-m using single-mode AlGaAs/GaAs strip-loaded waveguides. The results are r41 = - (1.54 +/- 0.08) x 10(-10) cm/V, R11 = - (9.3 +/- 2.8) x 10(-17) cm2/V2 and R12 = - (5.1 +/- 1.9) x 10(-17) cm2/V2 at 1.32-mu-m and r41 = - (1.50 +/- 0.08) x 10(-10) cm/V, R11 = - (3.2 +/- 2.3) x 10(-17) cm2/V2 and R12 = - (5.1 +/- 2.6) x 10(-17) cm2/V2 at 1.52-mu-m. These results, together with those previously measured at different wavelengths, are compared with published theoretical models. The linear electro-optic coefficient r41 is slightly dispersive near the band gap and roughly constant for longer wavelengths, in good agreement with the models. The quadratic electro-optic coefficients drop rapidly with increasing wavelength, in good agreement with a model based on electroabsorption.