The same may occur from violation of distance limitations on multimode fiber, resulting in high modal dispersion. The simplest troubleshooting tool is the Visual Fault Locator, or VFL. This inexpensive tool that should be found in virtually every fiber technician's tool bag uses a bright laser beam. The performance of a fiber optic splice is determined by a number of factors, including the quality of the fiber, the cleanliness of the splice, and the techniques used to make the splice. Intrinsic factors, such as the refractive index of the fiber, are those that are inherent to the fiber itself. Fiber fusion splicing is a technology used to connect optical fibers. There are different techniques for joining fiber ends: Permanent and stable connections with very low insertion losses can be obtained by fusion splicing.
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