Fig. 1. System block diagram

Fig. 2. Processor and peripheral interface circuit

Fig. 3. Digital supermode distributed Bragg reflector laser

Fig. 4. Current driven circuit

Fig. 5. Automatic temperature control circuit

Fig. 6. Multi-range control and sampling circuit

Fig. 7. LCD touch screen control circuit based on FSMC interface

Fig. 8. Running flowchart of underlying driver software

Fig. 9. Principle block diagram of power calibration

Fig. 10. Display interface on host computer

Fig. 11. Output optical power of test source

Fig. 12. Spectra of outputs at different wavelengths. (a) 1530 nm; (b) 1540 nm; (c) 1550 nm