Low bend loss optical fiber

摘要

An optical fiber having both low macrobend loss and low microbend loss. The fiber has a first inner cladding region having an outer radius r2>8 microns and refractive index Delta2 and a second outer cladding region surrounding the inner cladding region having refractive index Delta3, wherein Delta1>Delta3>Delta2. The difference between Delta3 and Delta2 is greater than 0.01. The fiber exhibits a 22 m cable cutoff less than or equal to 1260 nm, and r1/r2 is greater or equal to 0.25.