Fig. 1. (a) Three-dimensional structure and (b) planar structure of a tapered-MOPA

Fig. 2. Schematic diagram of double tapered laser. (a) Planar structure; (b) three-dimensional structure; (c) SEM profile of the surface grating; (d) top view of the SEM of surface grating; (e) periodic electric injection diagram^[33]

Fig. 3. Structure diagram of a ridge-amplifier MOPA

Fig. 4. Structure diagram of a bent ridge-amplifier MOPA^[35]

Fig. 5. Structure diagrams of grating-MOPA. (a) DBR; (b) DFB

Fig. 6. Structure diagram of a double DBR grating MOPA^[47]

Fig. 7. Schematic diagram of the frequency doubling setup with a MOPA^[50]

Fig. 8. Structure diagram of a MOPA with tapered grating^[52]

Fig. 9. Structure diagram of three section MOPA

Fig. 10. MOPA-based external Cavity mode-locked laser^[60]

Fig. 11. Diagram of separating electrode