Fig. 1. System scheme diagram

Fig. 2. Package structure of piezoelectric ceramics and fiber Bragg grating

Fig. 3. Center transmission wavelength of fiber Bragg grating varying with voltage applied to piezoelectric ceramics

Fig. 4. Laser stability test. (a) Wavelength stability; (b) frequency stability

Fig. 5. Output wavelength of DFB laser varying with operating current

Fig. 6. Test results of laser output wavelength feedback control without modulation

Fig. 7. Stability test of laser output under modulation of triangular wave with ±10 mV voltage, 300 s period, and 55° initial phase. (a) Modulated laser wavelength; (b) feedback control stability test

Fig. 8. Stability test of the laser output under a sine wave modulation of ±20 mV voltage, a period of 400 s, and an initial phase of 50°. (a) Modulated laser wavelength; (b) feedback control stability test