Fig. 1. Schematic of current source 1

Fig. 2. Schematic of current source 2

Fig. 3. Temperature control circuit. (a) H bridge drive circuit; (b) temperature acquisition circuit

Fig. 4. Structure diagram of fuzzy adaptive PID system

Fig. 5. Experimental setup of chaotic semiconductor laser output performance test

Fig. 6. Output characteristics of chaotic semiconductor laser. (a) Optical spectrum; (b) frequency spectrum;(c)time series;(d)ACF

Fig. 7. Dynamic distributions of output characteristics of chaotic semiconductor lasers change with current and temperature. (a) Bandwidth; (b) time delay characteristic distribution

Fig. 8. Current source circuit module

Fig. 9. Output current stability of current source 1. (a) Output current is 20.00 mA; (b) output current is 40.00 mA

Fig. 10. Output current stability of current source 2. (a) Output current is 20.00 mA; (b) output current is 40.00 mA; (c) output current is 80.00 mA; (d) output current is 100.00 mA

Fig. 11. Output stability of current source 1 at different ambient temperatures. (a) Ambient temperature is 10.0 ℃; (b) ambient temperature is 20.0 ℃; (c) ambient temperature is 30.0 ℃; (d) ambient temperature is 40.0 ℃

Fig. 12. Output stability of current source 2 at different ambient temperatures. (a) Ambient temperature is 10.0 ℃; (b) ambient temperature is 20.0 ℃; (c) ambient temperature is 30.0 ℃; (d) ambient temperature is 40.0 ℃

Fig. 13. Output current linearity of current source 1 and 2. (a) Output current linearity of current source 1;

Fig. 14. Output optical power stability of the chaotic semiconductor laser. (a) Test results driven by current source 1; (b) test results driven by current source 2

Fig. 15. Output optical spectrum of chaotic semiconductor laser driven by developed current source.(a) Test results driven by current source 1; (b) test results driven by current source 2

Fig. 16. Temperature control circuit module

Fig. 17. Output wavelength tuning of chaotic laser from 18.0 ℃ to 40.0 ℃

Fig. 18. Output wavelength tuning of chaotic laser from 24.0 ℃ to 25.0 ℃

Fig. 19. Laser temperature fluctuation and central wavelength drift at 25.0 ℃. (a) Temperature fluctuation;

Fig. 20. Laser temperature fluctuation at different ambient temperatures. (a) Ambient temperature is 10.0 ℃; (b) ambient temperature is 20.0 ℃; (c) ambient temperature is 30.0 ℃; (d) ambient temperature is 40.0 ℃

Fig. 21. Rapid temperature regulation results based on fuzzy adaptive PID algorithm. (a) Rapid adjustment result of temperature from 18.0 ℃ to 25.0 ℃; (b) rapid adjustment result of temperature from 40.0 ℃ to 25.0 ℃