Fig. 1. Block diagram of overall design

Fig. 2. Constant current linear slow-start circuit

Fig. 3. Simulation results of slow-start circuit

Fig. 4. Constant current drive circuit

Fig. 5. Current limiting and electrostatic protection circuit

Fig. 6. Schematic diagram of temperature control circuit

Fig. 7. Physical drawing of temperature control circuit

Fig. 8. Flow chart of software control

Fig. 9. RTL diagram of incremental PID control module

Fig. 10. Experimental platform of diode laser drive control system

Fig. 11. Fitting curve of control voltage and operating current

Fig. 12. Current stability of LD

Fig. 13. Stability of the output optical power