Fig. 1. Epitaxial structure of InGaAs/GaAsP quantum well laser

Fig. 2. P-I characteristic curves of three kinds of tapered lasers

Fig. 3. Electro-optical conversion efficiency curves of three kinds of tapered lasers

Fig. 4. Spectra of tapered laser with ridge waveguide regions of different lengths

Fig. 5. Far field intensity profiles of tapered laser with ridge waveguide regions of different lengths. (a) Vertical direction; (b) horizontal direction

Fig. 6. Far field intensity profiles of ridge waveguide devices with different lengths. (a) Vertical direction; (b) horizontal direction