Fig. 1. (a) Schematic diagram of the structure of a CTFBG and (b) simulated transmission spectra of a TFBG and a CTFBG with a tilt angle of $4^{\circ }$; the chirp rate of the CTFBG is $0.3~\text{nm}/\text{cm}$.

Fig. 2. Simulation of (a) the SRS spectrum of 1080 nm fiber laser, (b) transmission spectra of CTFBGs with different tilt angles and (c) transmission spectra of CTFBGs with different chirp rates.

Fig. 3. (a) Inscription system based on a tilted-phase-mask method with an online parameter measurement system and (b) the resulting CTFBG spectral measurement.

Fig. 4. (a) Thermal image of the CTFBG without annealing; (b) schematic diagram of the temperature variation in the high-temperature annealing; (c) thermal image of the CTFBG after annealing; (d) spectrum of the CTFBG after annealing.

Fig. 5. (a) Schematic diagram of the heating of the coating in the laser incident direction and (b) thermal image of the CTFBG without a stripper. (c) Schematic diagram of the stripper constructed by the method of segmented corrosion and (d) thermal image of the CTFBG with a stripper.

Fig. 6. kW-level high-power testing system.

Fig. 7. Output spectra of the testing system (a) without the CTFBG and (b) with the CTFBG; (c) the difference between the output spectra of the system with and without the CTFBG.