Propagation characteristics of GaAsP heterostructure waveguides for 1.06 microm and 0.905 mum wavelengths: an evaluation.

Propagation characteristics of GaAs/GaAs (1-x)P(x) and GaAs (1-y)Py/GaAs(1-x)P(x) waveguides are evaluated at 1.06-mum. and 0.905-mum wavelengths. Attenuation of the lowest order mode in single-mode and two-mode waveguides is 1.2 dB/cm at 1.06 mum. At 0.905 mum the measured attenuation rate for the GaAs(0.80)P(0.20)/GaAs(0.65)P(0.35) waveguide is 1.5 dB/cm. Multimode waveguides have considerable mode conversion due to surface undulations caused by grading dislocations. Refractive indices have also been calculated from experimental data at 1.06 mum for GaAs and GaAs(0.65)P(0.35)to be 3.47 and 3.325, respectively.