Patent ID: 8081854
Filing Date: 2011-12-20
Classification: G02B

Abstract:
1. A low bend loss optical fiber comprising: a core; an inner layer, disposed outside of, and adjacent, the core, having a refractive index lower than a refractive index of the core, the refractive index of the inner layer gradually decreasing from an inner circumference of the inner layer as a distance from the core increases; a trench layer, disposed outside of, and adjacent, the inner layer, having a lowest refractive index; and an outer layer, disposed outside of, and adjacent, the trench layer, having a refractive index that is higher than the lowest refractive index of the trench layer and lower than the refractive index of the core, wherein the refractive index of the trench layer continuously changes from an outer circumference of the inner layer to an inner circumference of the outer layer without maintaining constant in the refractive index of the trench layer, and the trench layer comprises: a first trench sub layer whose refractive index decreases continuously and linearly at a constant slope as a distance from the core increases; and a second trench sub layer, adjacent the first trench sub layer, having a refractive index that increases continuously and linearly at a constant slope as the distance from the core increases.