Fig. 1. Structural diagram of multi-channel semiconductor laser temperature controller

Fig. 2. Circuit principle diagram of temperature collection channel 1

Fig. 3. Physical picture of multi-channel semiconductor laser temperature control system

Fig. 4. Temperature control experimental results. (a) LD1; (b) LD2

Fig. 5. Stability test results of laser temperature control. (a) Stability of LD1 at 30 ℃; (b) stability of LD2 at 45 ℃

Fig. 6. Output spectra of lasers with fixed current and various temperatures. (a) LD1; (b) LD2

Fig. 7. Stability test of emitting spectrum of DFB laser. (a) LD1; (b) LD2