Patent ID: 6529665
Filing Date: 2003-03-04
Classification: B29D,G02B

Abstract:
A graded index type optical fiber having a multilayer structure comprising a plurality of concentrically arranged non-blended layers formed of (co)polymers which have a glass transition temperature (Tg) of 80Â° C. or above and are selected from the group consisting of two or more homopolymers HP1, HP2, . . . and HPn in which n is an integer of 2 or greater composed of units of vinyl monomers M1 , M2, . . . and Mn, respectively provided that the refractive indices of the homopolymers decrease in that order, and one or more binary copolymers CPs composed of units of vinyl monomers M1, M2, . . . and Mn, wherein the refractive index is highest at the center of the multilayer structure and decreases gradually toward the outer periphery thereof.