GROSSARY

Double-Clad Fiber

A typical conventional fiber design has a core of doped silica glass with a cladding of pure silica, and the waveguide is formed by the difference between their refractive indices which encourages light to propagate in the core. A double-clad fiber has an additional cladding layer of lower, or depressed, index – this forms a waveguide region between the pure silica inner cladding and the depressed index outer cladding. This geometry is illustrated with a sketch of the refractive index profile, RIP, see below.

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