Easily Manufacturable GaAs/AlGaAs DFB Lasers with Shallow Surface Gratings and Oxide Aperture

An easily manufacturable oxide-aperture ridge-waveguide GaAs/AlGaAs DFB laser has been demonstrated with first-order surface-gratings shallowly etched into the ridge. Uncoated devices exhibit threshold-current of 10 mA and SMSR>40 dB. Stable single-mode operation has been observed over the temperature range from 10 to 50 °C.