Patent ID: 6243522
Filing Date: 2001-06-05
Classification: B82Y,C03B,G02B,H01S

Abstract:
An optical waveguide fiber preform comprising:a core body having a longitudinal axis and an effective refractive index;a plurality of clad rods, each clad rod having a longitudinal axis, and including a central portion, and a layer surrounding the central portion;wherein the refractive index of the central portion is different from the refractive index of the layer surrounding the central portion by a pre-selected amount and the clad rod diameters are pre-selected; and,wherein the plurality of clad rods are held in position about the core body to form an assembly comprising a layer of clad rods surrounding the core body; and,wherein the pre-selected amount of difference between the respective refractive indexes of the clad rod central portion and the clad rod surrounding layer provides an effective refractive index of the layer of clad rods that is less than the effective refractive index of the core body.