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Cladding is the application of one material over another to provide a skin or layer. In construction , cladding is used to provide a degree of thermal insulation and weather resistance , and to improve the appearance of buildings. [ 1 ]
Early cladding materials included oils, waxes, and polymers. Lawrence E. Curtiss at the University of Michigan developed the first glass cladding in 1956, by inserting a glass rod into a tube of glass with a lower refractive index, fusing the two together, and drawing the composite structure into an optical fiber. [4]
The 1 inch insulation glass is typically made up of two 1/4-inch lites of glass with a 1 ⁄ 2 inch (13 mm) airspace. The air inside is usually atmospheric air, but some inert gases, such as argon or krypton, may be used in order to offer better thermal transmittance values. In Europe, triple-pane insulating glass infill is now common.
The light is guided down the core of the fiber by an optical cladding with a lower refractive index that traps light in the core through total internal reflection. For some types of fiber, the cladding is made of glass and is drawn along with the core from a preform with radially varying index of refraction.
2. Cladding 125 μm dia. 3. Coating 250 μm dia. 4. Buffer or jacket 900 μm dia. Light propagating in a multi-mode fiber. The core of a conventional optical fiber is the part of the fiber that guides the light. It is a cylinder of glass or plastic that runs along the fiber's length. [1]
Hard-clad silica (HCS) or polymer-clad fiber (PCF) is an optical fiber with a core of silica glass (diameter: 200 μm) and an optical cladding made of special plastic (diameter: 230 μm). In contrast to all-silica fiber, the core and cladding can be separated from each other.