Fig. 1. CDBR-LD device and structure parameters. (a) 3D structure diagram of CDBR-LD; (b) picture of CDBR-LD single tube; (c) structure parameters of combined grating and ridge waveguide; (d) photo of CDBR-LD after packaging

Fig. 2. Influence of hybrid grating region on lateral mode of each order of incident light. (a) TE₀₀; (b) TE₁₀; (c) TE₂₀; (d) TE₃₀

Fig. 3. Influence of hybrid grating region on each order lateral mode of feedback light. (a) TE₀₀; (b) TE₁₀; (c) TE₂₀; (d) TE₃₀

Fig. 4. Influence of W_G on energy transmittance of each order lateral mode with energy transmittance difference between TE₀₀ and TE₂₀ shown in inset. (a) Incident light; (b) feedback light

Fig. 5. Far-field spots and energy diagrams of DBR-LD and CDBR-LD at different currents. (a) DBR-LD, injection current of 0.7 A; (b) CDBR-LD, injection current of 0.7 A; (c) DBR-LD, injection current of 1.0 A; (d) CDBR-LD, injection current 1.0 A

Fig. 6. Spectra of DBR-LD and CDBR-LD under different injection currents. (a) DBR-LD; (b) CDBR-LD

Fig. 7. P-I curves of DBR-LD and CDBR-LD