Double Clad Fiber
Double-clad fiber (DCF) is a class of optical fiber with a structure consisting of three layers of optical material instead of the usual two. The inner-most layer is called the ''Fiber optics#Principle of operation, core''. It is surrounded by the ''inner Cladding (fiber optics), cladding'', which is surrounded by the ''outer cladding''. The three layers are made of materials with different refractive index, refractive indices. There are two different kinds of double-clad fibers. The first was developed early in optical fiber history with the purpose of engineering the Dispersion (optics), dispersion of optical fibers. In these fibers, the core carries the majority of the light, and the inner and outer cladding alter the waveguide dispersion of the core-guided signal. The second kind of fiber was developed in the late 1980s for use with high power fiber amplifiers and fiber lasers. In these fibers, the core is doped with Active laser medium, active dopant material; it both guides ...
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