Fig. 1. Design of the asymmetric large optical cavity epitaxial structure:(a) Mode calculation results, (b) influence of the waveguide thickness on the slope efficiency

Fig. 2. Optimization of waveguide doping and test results of characteristic temperatures (a) Optimization of waveguide doping, (b) test results of characteristic temperatures

Fig. 3. Test results of the 2 mm long single emitter (a) P-I and efficiency curve, (b) far-field curve

Fig. 4. Improvement of the 4 mm long single emitter (a) suppression of the spatial hole burning effect by optimization of front facet reflectivity, (b) CW power and efficiency test results of the optimized emitter

Fig. 5. Reliability test results of the 4 mm long single emitter

Fig. 6. Power and spectra test results of the fiber coupling module

Fig. 7. Reliability test results of the fiber coupling module