Fig. 1. Schematic view of the MCI laser

Fig. 2. Reflection spectra of the MCI sections with different center wavelengths. (a) 1530 nm; (b) 1540 nm; (c) 1550 nm; (d) 1560 nm

Fig. 3. Simulation results of rate equation. (a) Superimposed lasing spectra at different wavelengths; (b) SMSRs corresponding to different lasing wavelengths

Fig. 4. Microscope picture of MCI laser with integrated SOA

Fig. 5. Offset-quantum-well structure of the active-passive integration

Fig. 6. SEM pictures. (a) Waveguide of deeply etched; (b) structure of deep-shallow transition

Fig. 7. Experimental characterization system for the MCI laser with integrated SOA

Fig. 8. Test results of MCI laser with integrated SOA. (a) Lasing spectrum at wavelength of 1555 nm; (b) superimposed spectra at wavelength of 1530--1570 nm; (c) SMSRs corresponding to different wavelengths; (d) LI curves corresponding to different wavelengths

Fig. 9. Microscope picture of the four-channel interference laser

Fig. 10. Test results of four-channel interference laser. (a) Superimposed spectra at wavelength of 1536.609-1568.080 nm; (b) SMSRs corresponding to different wavelengths

Fig. 11. MCI laser of thermally tuned. (a) Microscope picture; (b) SEM picture of the air waveguide cross section

Fig. 12. Superimposed spectra at wavelength of 1530--1570 nm. (a) Image of superimposed spectra; (b) SMSRs corresponding to different wavelengths; (c) total thermal tuning powers consumption corresponding to different lasing wavelengths; (d) Lorenz linewidths corresponding to different lasing wavelengths