Fig. 1. Structure of dual-fiber Bragg grating

Fig. 2. Reflectivity simulation results of dual-fiber Bragg grating

Fig. 3. 974 nm dual-fiber Bragg grating laser structure

Fig. 4. Principle diagram of forward pressure drop test

Fig. 5. Output spectrum before and after adding dual-fiber Bragg grating device at room temperature

Fig. 6. PIV characteristic curves at room temperature

Fig. 7. Change curves of peak wavelength and temperature with time

Fig. 8. Differential structure function curves of chip and heat sink

Fig. 9. Change curves of pigtail output power and temperature with time