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Light emitted along fine wine from casks stream; it also found that energy along a curved glass rod forward. Why is this? Do not light straight into it? The phenomenon has aroused the attention of Tyndall, through his research, found it to be [1] role, due to the water because of the high density of the medium surrounding material (such as air), ie, toward the air from the water, when the incidence When more than a certain angle, refracted light disappears, all of the light is reflected back into the water. On the surface, the light seems to bend forward in the water. Due to the speed of light in different substances are different, so the light is directed from one substance to another substance, at the interface of two materials will produce refraction and reflection. Moreover, the angle of refraction of light will vary the angle of incident light changes. When the angle of incident light reaches or exceeds a certain angle, the refracted light will disappear, all the incident light is reflected back, and this is totally reflected light is incident light to the optical fiber end face and can not all be the transmission fiber, but at a certain angle within the scope of the incident can. This angle is called the numerical aperture of the fiber. The numerical aperture of the fiber for fiber butt bigger is advantageous. The numerical aperture of the fiber of different manufacturers of different (AT & T CORNING). Fluorine-doped fiber (Fluorine Doped Fiber) is one of the typical quartz fiber products. Typically, as the communication 1.3μm wave field with fiber, control the core dopant is germanium dioxide (GeO2), cladding is made of SiO2. But then fluorine fiber core, mostly using SiO2, and in the cladding is the incorporation of fluorine. Due to Rayleigh scattering loss is due to changes in the refractive index caused by the phenomenon of light scattering. So, I hope the formation of a refractive index change factors dopants to less preferred. The main effect of fluoride can reduce the refractive index of SIO2. Thus, commonly used in the cladding of doping.