Quadruply Clad Fiber

A quadruply clad fiber is a single mode fiber that has four claddings. As with doubly clad fibers, the refractive index of the cladding layers are lower than that of the core. The four layers of cladding are arranged so that the lowest refractive index layer is closest to the core and then alternates as it moves out. Therefore the arrangement is lowest, highest, lower, higher as you radiate out from the core. Quadruply clad fibers have a very low macrobending loss.

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