Optical fiber laser positive reflection resolving device, resolving method and application method

The invention discloses an optical fiber laser positive reflection resolving device, resolving method and application method.The optical fiber laser positive reflection resolving device comprises an input end photoelectric sensor, a transmission efficiency nonreciprocal optical device and an output end photoelectric sensor which are sequentially arranged, and the input end photoelectric sensor and the output end photoelectric sensor are used for receiving scattered light of an optical fiber; the acquisition and calculation module receives optical fiber scattering light intensity signals monitored by the input end photoelectric sensor and the output end photoelectric sensor; and the acquisition and calculation module is used for converting the light intensity signal into detection light power values of the input end photoelectric sensor and the output end photoelectric sensor, and obtaining a forward light power value, a reverse light power value and a return light power value according to the forward transmis