The fiber optic spectrometer mainly consists of a spectrometer, a light source, and fiber optic spectral loss measurement software. The light source is coupled into the fiber optic through a collimating lens, and the light source is transmitted from the fiber optic to the spectrometer through a slit coupling into the spectrometer. The incident light of the spectrometer will be scattered from short wave to long wave starting from the zeroth order according to the wavelength, and imaged on the CCD. The data will be sent to the computer for processing through the CCD data acquisition card. The wavelength range of the spectrometer is 200-1100nm, with a spectral resolution of 1.5nm.