A characteristic of the design of any optical fiber is that the permittivity of the fiber is greater than the permittivity of the cladding. Thus, from the perspective of the light ray, the fiber appea...A characteristic of the design of any optical fiber is that the permittivity of the fiber is greater than the permittivity of the cladding. Thus, from the perspective of the light ray, the fiber appears to be an unbounded half-space sharing a planar boundary with the cladding, which also appears to be an unbounded half-space. First, it determines the critical angle for total internal reflection, and subsequently determines the minimum radius of curvature for lossless operation of the fiber.
