Fig. 1. Schematic diagram of Brillouin dynamic grating generation

Fig. 2. Experimental setup for generating BDG in polarization-maintaining fiber^[2]

Fig. 3. Relationship between BDG reflection spectrum width and grating length

Fig. 4. Experimental setup for generating BDG in single-mode fiber^[5]

Fig. 5. Reflection spectra of different lengths of BDG in single-mode fiber^[5]. （a） L=11 m； （b） L=20 m； （c） L=50 m； （d） L=100 m

Fig. 6. Gain spectra of BDG with different wavelengths in single-mode dispersion-shifted fiber^[6]

Fig. 7. Experimental setup for producing and reading BDG in a few-mode fiber^[7]

Fig. 8. Local reflection spectra of BDG in a few-mode fiber^[9]

Fig. 9. Experimental setup of distributed temperature and strain sensing using BDG and BGS^[10]

Fig. 10. Relationship of ν_Bire with temperature and strain^[10]. (a) Under different temperature; (b) under different strain

Fig. 11. Relationship between fiber distance and intensity of chirped BDG and non-chirped BDG^[11]

Fig. 12. Relationship between the intensity and distance of chirped BDG and non-chirped BDG formed at different powers^[12]. (a) 78 W write pulse power; (b) 183 W write pulse power

Fig. 13. Acoustic field two-dimension distribution of phase-shifted BDG^[17]

Fig. 14. Reflection spectra of phase-shifted BDG^[17]

Fig. 15. Reflection spectra of phase-shifted BDG under different phase shifts of pump pulses^[17]

Fig. 16. Chaotic BDG acoustic field generated in polarization-maintaining fiber^[20]. (a) Three-dimensional distribution; (b) two-dimensional distribution

Fig. 17. Reflection characteristics of chaotic BDG^[21]. (a) Chaotic BDG reflection spectra with different grating lengths; (b) relationship between chaotic BDG reflection spectrum width and grating length

Fig. 18. Two-dimensional distribution of random BDG acoustic field generated in polarization-maintaining fiber^[25]. (a) Distribution of acoustic field; (b) BDG generation time versus position of polarization-maintaining fiber

Fig. 19. Random BDG reflection spectra generated in the polarization maintaining fiber^[25]. (a) Random pulse width of 1 ns; (b) random pulse width of 1.2 ns

Fig. 20. Strain and temperature coefficient measurement^[26]. (a) Strain; (b) temperature

Fig. 21. Simulation results of simultaneous measurement of temperature and strain in Panda polarization-maintaining fiber^[28]. (a) Measured Brillouin and birefringent frequency shifts; (b) temperature and strain distribution after demodulation

Fig. 22. Measurement results of distributed optical fiber sensing system with high spatial resolution^[31]

Fig. 23. Relations between BireFS and transverse load^[34]. (a) Various load direction; (b) various load weight

Fig. 24. Reflection pulse of Brillouin dynamic grating at 3 different positions (A, B, C) in 120 m fiber^[35]

Fig. 25. Optical storage is realized by using SBS effect^[11]. (a) Chirped BDG is used to store the chirped signal pulse; (b) compressed signal pulse is obtained by "reading" the pulse probe grating with the chirp in the opposite direction

Fig. 26. BDG-based all-optical flip-flop^[37]. (a) Flip-flop output is set by input pulse; (b) output can be switched back to low level by using the second probe pulse in the opposite phase