  We present here the inscription of single-mode waveguides with Bragg gratings
in sapphire. The waveguide Bragg gratings have a novel multi-layer depressed
cladding design in the 1550 nm telecommunications waveband. The Bragg gratings
have a narrow bandwidth (<0.5 nm) and have survived annealing at 1000{\deg}C.
The structures are inscribed with femtosecond laser direct writing, using
adaptive beam shaping with a non-immersion objective. A single-mode sapphire
fiber Bragg grating is created by writing a waveguide with a Bragg grating
within a 425 {\mu}m diameter sapphire optical fiber, providing significant
potential for accurate remote sensing in ultra-extreme environments.
