Fig. 1. Schematic of fiber Bragg grating sensing demodulation system based on self-injection locking

Fig. 2. Laser output spectral lines without injection locking

Fig. 3. Output laser spectral lines observed on spectrometer

Fig. 4. Beat signals observed on spectrum analyzer

Fig. 5. Spectral diagram of the higher beat frequency observed on spectrum analyzer

Fig. 6. Laser output spectral lines under different temperatures

Fig. 7. Relationship between laser energy and beat frequency under different temperatures

Fig. 8. Fitting curve of wavelength under different temperatures

Fig. 9. Fitting curve of beat frequency under different temperatures