Claim: A Distributed Bragg Reflector laser has diffraction grating (which splits and diffracts light into several beams travelling in different directions) on one or both end mirrors, which reflect a narrow band of light back in the cavity which help them be more spectrally stable.
Evidence: In optics, a diffraction grating is an optical component with a periodic structure that splits and diffracts light into several beams travelling in different directions.