Fiber superfluorescence light sources have the advantages of compact structure, easy integration, high environmental stability, and wide fluorescence spectrum. Compared with lasers, they have low coherence, no self-pulse, no relaxation oscillation, no mode competition, and extremely high temporal stability. Due to its characteristics, it has been widely used in fiber optic sensing, fiber optic gyroscopes, low-coherence optical imaging, gas sensing, optical device testing and other fields. The 1.0μm, 1.5μm, and 2.0μm band optical fiber superfluorescence light sources independently developed by the laboratory have the advantages of high power, large bandwidth, and high stability. The 3dB spectral bandwidth can reach up to 100nm, and the industrialization of light sources has been achieved. Low-power light sources have been used in fiber optic device testing.