Diffraction beam characteristics of the tapered-platform fiber

The diffraction beam characteristics of tapered-platform fiber are demonstrated by theoretical analysis and experimental measurement. The tapered-platform fiber is designed and fabricated. Based on light ray theory, the Gauss beam lens conversion model is established and the outgoing beam of the tapered-platform fiber end-face is analyzes. The transmission characteristics at the near field and far field spatial distribution of the tapered-platform fiber are measured with visible light, which are showing the evolution of tapered-platform fiber in optical transmission and mode spot. A CCD based video zoom microscope system is built to record cone optical fiber diffraction, and the diffraction pattern of tapered-platform fiber diffraction field in different locations is tested. The results show the diffraction field of tapered-platform fiber is Gauss beam, this research will provide important reference to the application of tapered-platform fiber.