Coating layer ultraviolet transparent chirp weak fiber grating enhanced OFDR signal-to-noise ratio and preparation method thereof

The invention discloses a coating layer ultraviolet transparent chirp weak fiber grating enhanced OFDR signal-to-noise ratio and a preparation method thereof, and belongs to the field of fiber distribution sensing. According to the method for enhancing the signal-to-noise ratio of the OFDR, a coating layer ultraviolet transparent chirp weak fiber bragg grating is used as a sensing optical fiber of an OFDR distributed sensing system, and the strength and the signal-to-noise ratio of an optical signal measured by the OFDR distributed sensing system are improved; according to the preparation method of the coating layer ultraviolet transparent chirp weak optical fiber grating, the coating layer ultraviolet transparent optical fiber is used, and the coating layer does not need to be removed in the inscribing process; in addition, the chirp weak fiber bragg gratings which are continuously arranged from large to small or from small to large or from large to small and then from small to large are continuously inscrib